JP7318413B2 - HARD DISK DRIVE, INFORMATION PROCESSING DEVICE, HARD DISK DRIVE CONTROL METHOD, AND PROGRAM - Google Patents

Description

The present invention relates to a hard disk drive, an information processing apparatus, a hard disk drive control method, and a program.

In a hard disk drive (HDD) equipped with a magnetic disk (HD), a data recording area provided on the surface of the HD is accessed by bringing the magnetic head close to the surface of the rotating HD. Accessing (writing or reading data) is being performed.
If the magnetic head is brought into contact with the data recording area, the HD may be destroyed or damaged. ) is provided. The magnetic head is positioned at the retracted position when the HDD is powered off or idle, and moves from the retracted position to the data recording area while the HD is rotating. When the magnetic head is positioned in the data recording area, the magnetic head floats slightly above the surface of the HD.
When the magnetic head is located in the data recording area, external vibration or shock may damage or destroy the HD. Therefore, techniques have been proposed to reduce the risk of damage or destruction of the HD. there is For example, in Patent Document 1, in an information processing device that secures free space in the memory by saving data stored in the memory to the HDD, when the information processing device is operating in the energy saving mode, data stored in the memory is transferred to the HDD. Techniques have been disclosed for reducing the risk of damage or destruction of the HD by reducing the frequency of saving data.

In the above-mentioned Patent Document 1, the HD is protected by reducing the frequency of saving data from the memory to the HDD. Since the magnetic head cannot return to the home position when the magnetic head is in the idle state, the data recording area is accessed for a long time.
If the magnetic head accesses the data recording area for a long time, the temperature inside the HDD rises and the oil used in the mechanical parts may evaporate. The head may deteriorate. In addition, if the magnetic head accesses the data recording area for a long time, the possibility of external vibration or impact increases.
SUMMARY OF THE INVENTION It is an object of the present invention to protect an HD even when access to the HD continues at a high frequency.

In order to solve the above-mentioned problems, the invention according to claim 1 provides a rotating magnetic disk provided with a data recording area in which data is recorded by magnetism, and a magnetic disk capable of freely accessing the data recording area during rotation of the magnetic disk. an actuator for moving the magnetic head between the data recording area and a retraction position outside the data recording area; and when the retraction condition is satisfied during access to the data recording area by the magnetic head, the a control means for moving the magnetic head to the retracted position, and for resuming access to the data recording area by moving the magnetic head to the data recording area when a return condition is satisfied during the retraction of the magnetic head. Further, the control means determines that the save condition is satisfied when the time for continuous access to the data recording area by the magnetic head exceeds a specified time.
According to a second aspect of the present invention, there is provided a rotating magnetic disk provided with a data recording area in which data is magnetically recorded, a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk, and the magnetic head. between the data recording area and a retracted position outside the data recording area; and moving the magnetic head to the retracted position when a retraction condition is satisfied during access to the data recording area by the magnetic head. and control means for moving the magnetic head to the data recording area and restarting access to the data recording area when a return condition is satisfied during the retraction of the magnetic head, wherein the control means controls the magnetic head. It is determined that the save condition is established when a total amount of data continuously written to the data recording area by the method exceeds a specified amount.
According to a third aspect of the present invention, there is provided a rotating magnetic disk having a data recording area in which data is magnetically recorded, a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk, and the magnetic head. between the data recording area and a retracted position outside the data recording area; and moving the magnetic head to the retracted position when a retraction condition is satisfied during access to the data recording area by the magnetic head. and control means for moving the magnetic head to the data recording area and restarting access to the data recording area when a return condition is satisfied during the retraction of the magnetic head, wherein the control means comprises the magnetic head. It is characterized in that it is determined that the return condition is established when the retraction time of the head has passed a specified time.
According to a fourth aspect of the present invention, there is provided a rotating magnetic disk provided with a data recording area in which data is magnetically recorded, a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk, and the magnetic head. between the data recording area and a retracted position outside the data recording area; and moving the magnetic head to the retracted position when a retraction condition is satisfied during access to the data recording area by the magnetic head. a control means for moving the magnetic head to the data recording area and restarting access to the data recording area when a return condition is satisfied during evacuation of the magnetic head; and a memory for storing the data, wherein the control means stores the data in the memory after the save condition is satisfied, and sequentially stores the data in the memory after the return condition is satisfied. It is characterized by recording in a data recording area.

According to the present invention, the HD can be protected even when access to the HD continues at a high frequency.

1 is a system configuration diagram showing an overview of an information processing system according to one embodiment of the present invention; FIG. 3 is a hardware configuration diagram of the MFP; FIG. 2 is a diagram showing the internal structure of an HDD; FIG. 3 is a hardware configuration diagram of an HDD controller; FIG. 2 is a block diagram showing the functional configuration of an HDD controller; FIG. It is a figure explaining control of 1st embodiment. It is a flow chart which shows processing of a first embodiment. It is a figure explaining control of a second embodiment. It is a flow chart which shows processing of a second embodiment. It is a figure explaining control of a third embodiment. It is a flow chart which shows processing of a third embodiment. It is a figure explaining control of a fourth embodiment. It is a flowchart which shows the process of 4th embodiment. It is a figure explaining control of a fifth embodiment. It is a flowchart which shows the process of 5th embodiment. It is a figure explaining control of 6th embodiment. FIG. 12 is a flow chart showing processing of the sixth embodiment; FIG.

The present invention relates to the HDD 110 provided in the information processing apparatus (MFP 1, server 2, notebook PC 3) shown in FIGS. 1 and 2, and is characterized in particular by position control of the magnetic head 114 shown in FIG. That is, the present invention moves the magnetic head 114 to the evacuation positions P1 and P2 when the evacuation condition is satisfied while the magnetic head 114 is accessing the data recording area 111a (writing or reading data). It is characterized in that the magnetic head 114 is moved to the data recording area 111a and the access to the data recording area 111a is restarted when the return condition is satisfied.

The features of the present invention are explained in detail with the aid of the following drawings. However, unless there is a specific description, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention. .

<Overview of information processing system>
First, an outline of the information processing system will be described. FIG. 1 is a system configuration diagram showing an outline of an information processing system according to one embodiment of the present invention.
In the information processing system shown in FIG. 1, an MFP (Multifunction Peripheral/Product/Printer) 1, a server 2, and a notebook PC (Personal Computer) 3 are connected via a communication network NW so as to be able to transmit and receive data to each other. For example, the MFP 1 can print data stored in the server 2 or data created by the notebook PC 3 .

<Hardware Configuration of MFP1>
FIG. 2 is a hardware configuration diagram of the MFP1. As shown in FIG. 2, the MFP 1 includes a controller 100, a short-range communication circuit 120, an engine control section 130, an operation panel 140, and a network I/F (InterFace) 150. FIG. Note that the hardware configuration of MFP 1 is not limited to the configuration shown in FIG. For example, the operation panel 140 may be configured to be connected to the SB 104 instead of the ASIC (Application Specific Integrated Circuit) 105 .
Among them, the controller 100 includes a CPU 101, which is the main part of the computer, a system memory (MEM-P) 102, a north bridge (NB) 103, a south bridge (SB) 104, an ASIC 105, and a local memory (MEM-P) which is a storage part. C) 106 , HDD controller 200 , and magnetic disk (HD) 111 as a storage unit. However, the configuration of the controller 100 is not limited to this. For example, two or more components such as the CPU 101, NB 103, and SB 104 may be realized by SoC (System on Chip). In this case, the SoC and ASIC 105 may be connected via a PCI-express (registered trademark) bus.

Among these, the CPU 101 is a control unit that performs overall control of the MFP 1 . The NB 103 is a bridge for connecting the CPU 101, the MEM-P 102, the SB 104, and the AGP bus 161. The NB 103 is a memory controller that controls reading and writing with respect to the MEM-P 102, a PCI (Peripheral Component Interconnect) master, and an AGP target. and

The MEM-P 102 is composed of a ROM 102a, which is a memory for storing programs and data for realizing each function of the controller 100, and a RAM 102b, which is used as a drawing memory for expanding the programs and data and for memory printing. The programs stored in the RAM 102a are configured to be provided by being recorded in a computer-readable recording medium such as a CD-ROM, CD-R, DVD, etc., in an installable or executable format. You may

SB 104 is a bridge for connecting NB 103 with PCI devices and peripheral devices. The ASIC 105 is an image processing IC (Integrated Circuit) having hardware elements for image processing, and serves as a bridge that connects the AGP bus 161, PCI bus 162, HDD controller 200, and MEM-C 106, respectively. This ASIC 105 includes a PCI target and AGP master, an arbiter (ARB) that forms the core of the ASIC 105, a memory controller that controls the MEM-C 106, and a plurality of DMACs (Direct Memory Access Controllers) that rotate image data using hardware logic. , and a PCI unit that transfers data between the scanner unit 131 and the printer unit 132 via the PCI bus 162 . Note that the ASIC 105 may be connected to a USB (Universal Serial Bus) interface or an IEEE 1394 (Institute of Electrical and Electronics Engineers 1394) interface.

MEM-C 106 is a local memory used as an image buffer for copying and an encoding buffer. The HD 111 is a storage for accumulating image data, accumulating font data used for printing, and accumulating forms. The HDD controller 200 controls reading or writing of data with respect to the HD 111 under the control of the CPU 101 . The HDD 110 has an HD 111 and an HDD controller 200 .

The AGP bus 161 is a bus interface for graphics accelerator cards proposed to speed up graphics processing, and can speed up the graphics accelerator card by directly accessing the MEM-P 102 with high throughput. . However, the MEM-C 106 may not be installed.
The short-range communication circuit 120 also includes an antenna 120a for transmitting and receiving data. The short-range communication circuit 120 is a communication circuit for NFC, Bluetooth (registered trademark), or the like.

Furthermore, the engine control section 130 is configured by a scanner section 131 and a printer section 132 . The operation panel 140 also includes a panel display unit 140a such as a touch panel for displaying current setting values, a selection screen, and the like, and for accepting input from the operator, and setting values for image forming conditions such as density setting conditions. A panel operation unit 140b is provided, which includes a numeric keypad for accepting the operation, a start key for accepting an instruction to start copying, an application switching key for accepting an instruction for switching functions performed by the MFP 1, and the like.
The controller 100 controls the entire MFP 1, such as drawing, communication, input from the operation panel 140, and the like. The scanner unit 131 or printer unit 132 includes an image processing section such as error diffusion and gamma conversion.

MFP 1 can switch and select the document box function, the copy function, the printer function, and the facsimile function in sequence using an application switching key on operation panel 140 . The document box mode is set when the document box function is selected, the copy mode is set when the copy function is selected, the printer mode is set when the printer function is selected, and the facsimile mode is set when the facsimile mode is selected. The operation panel 140 includes a display unit such as an LCD that displays various information and an LED that displays an operating state by turning on/off, an input unit that has a touch panel and hard key switches, and the like. Note that if the operation panel 140 has a touch panel, the hardware key switches may be omitted.

Network I/F 150 is an interface for data communication using communication network NW. The short-range communication circuit 120 and network I/F 150 are electrically connected to the ASIC 105 via the PCI bus 162 .

<Configuration of HDD 110>
FIG. 3 is a diagram showing the internal structure of the HDD 110. As shown in FIG. As shown in FIG. 3, the HDD 110 includes a disk-shaped HD 111 (magnetic disk, platter) having a data recording area 111a in which data is magnetically recorded, and a spindle motor that rotates a spindle 112 attached to the center of the HD 111. 113, an arm 115 having a magnetic head 114 attached to its tip and a rotatable base end, an actuator 116 that rotates the arm 115 to move the magnetic head 114 in the inner and outer radial directions of the HD 111, and the HDD 110. HDD controller 200 electrically connected to temperature sensor 117 for detecting internal temperature, magnetic head 114, actuator 116, spindle motor 113, and temperature sensor 117; HD 111, magnetic head 114, actuator 116, HDD controller 200, and a housing 118 that accommodates the temperature sensor 117 in an airtight state in its internal space.
In this HDD 110 , the HD 111 is rotated around the spindle 112 by the spindle motor 113 , and the magnetic head 114 at the tip of the arm 115 is moved radially inward and outward of the HD 111 by the actuator 116 .

On the innermost circumference of the surface of the HD 111, there is provided a retreat position (home position) P1 where the magnetic head 114 is positioned when the HD 111 stops rotating or is idle. The surface of the HD 111 corresponding to the retracted position P1 is provided with a ring-shaped non-adsorption region 111b that is surface-treated so that the magnetic head 114 in contact with the HD 111 is not attracted. Note that the save position may be provided outside the data recording area 111a, so it may be provided radially outside the outermost circumference of the HD 111 as indicated by P2. For the sake of convenience, the retracted position P1 will be taken as an example in the following description. The magnetic head 114 is positioned at the retracted position P1 until the HD 111 reaches a predetermined rotational speed, and is moved onto the data recording area 111a after the HD 111 reaches the predetermined rotational speed.

Data is magnetically recorded in the data recording area 111a, and the magnetic head 114 is moved in the inner and outer radial directions of the HD 111 according to the location where the data to be accessed is recorded. Since the HD 111 is rotating, the magnetic head 114 can access an arbitrary location in the data recording area 111a by moving the magnetic head 114 radially inward and outward of the HD 111 . The magnetic head 114 is moved to the retracted position P1 when the HDD 110 is in an idle state or when the power is turned off. Further, the magnetic head 114 is moved to the evacuation position P1 when the evacuation condition is established during continuous access to the data recording area 111a, and is moved to the data recording area 111a when the restoration condition is established during evacuation at the evacuation position P1. be done.

<Configuration of HDD controller 200>
FIG. 4 is a hardware configuration diagram of the HDD controller 200, and FIG. 5 is a block diagram showing the functional configuration of the HDD controller 200. As shown in FIG. As shown in FIG. 4, the HDD controller 200 includes a CPU 201 as a control unit that performs overall control of the HDD 110, and a system memory (MEM-H) 202 that stores programs, data, etc. for realizing each function of the HDD controller 200. , a control interface (I/F) 203 connecting the CPU 201 and the control unit 210, a communication interface (I/F) 204 connecting the CPU 201 and the ASIC 105, and a data recording area 111a of the magnetic head 114 to the retracted position P1. return function of the magnetic head 114 from the retracted position P1 to the data recording area 111a, positioning function of the magnetic head 114 on the data recording area 111a, and access to the data recording area 111a by the magnetic head 114 (data and a control unit 210 that controls the write/read function.
The HDD controller 200 further includes a disk rotation function module 221 that controls the number of rotations of the HD 111, a write/read function module 222 that outputs commands for writing and reading data to the magnetic head 114, and an address module. and a head retreat/return function module 224 for controlling the movement of the magnetic head 114 between the retreat position P1 and the data recording area.

A disk rotation function module 221 is connected to each of the spindle motor 113 and the control interface 203, a write/read function module 222 is connected to each of the magnetic head 114 and the control unit 210, a head positioning function module 223, and a head retraction module. A /return function module 224 is connected to each of the actuator 116 and the control unit 210 .

The CPU 201 of the HDD controller 200 has a cache (memory) 201a that temporarily stores data. The cache 201a can store data before being recorded in the data recording area 111a while the magnetic head 114 is retracted (see FIG. 8). The MEM-H 202 stores in advance various parameters such as prescribed times T1 and T2 (see FIG. 6) used for position control of the magnetic head 114, which will be described later. A temperature sensor 117 is connected to the control interface 203, and the HDD controller 200 uses the internal temperature of the HDD 110 (temperature inside the housing 118) detected by the temperature sensor 117 as SMART (Self-Monitoring Analysis and Reporting Technology) information. do.
The programs stored in the MEM-H202 should be recorded in a computer-readable recording medium such as a CD-ROM, CD-R, DVD, etc., in an installable or executable format. can be configured to Also, some components of the HDD controller 200 may be realized by SoC or hardware logic, or may be realized by software.

As shown in FIG. 5, the HDD controller 200 (control means) has access (write/read) control means 200A, save control means 200B, and access (write/read) control means 200A, save control means 200B, and and functions as a return control means 200C.

The access control means 200A controls access (data writing and data reading) to the data recording area 111a by the magnetic head 114. FIG. The retraction control means 200B monitors whether or not the retraction condition is satisfied while the magnetic head 114 is accessing the data recording area 111a, and moves the magnetic head 114 to the retraction position P1 when the retraction condition is satisfied. The return control means 200C monitors whether or not the return condition is satisfied while the magnetic head 114 is retracted, and when the return condition is satisfied, moves the magnetic head 114 from the retracted position P1 to the data recording area 111a to restore the data recording area 111a. 111a is restored.

<Control of First Embodiment>
The HDD 110 described above is technically characterized by position control of the magnetic head 114 during access to the data recording area 111a. Position control of the magnetic head 114 will be described in detail below.
FIG. 6 is a diagram for explaining the control of the first embodiment. As shown in FIG. 6, in the first embodiment, the HDD controller 200 starts accessing the data recording area 111a from time t0, and the continuous access time to the data recording area 111a by the magnetic head 114 reaches the specified time T1. At time t1, it is determined that the retraction condition is satisfied, and the magnetic head 114 is retracted to the retraction position P1. The specified time T1 is, for example, 60 minutes, but can be set to any time. The HDD controller 200 determines that the return condition is met at time t2 when the retraction time of the magnetic head 114 has passed the specified time T2, moves the magnetic head 114 to the data recording area 111a, and accesses the data recording area 111a. let it resume. The specified time T2 is, for example, one minute, but can be set to any time.

When the HDD controller 200 performs the above-described control, the temperature in the HDD 110 drops while the magnetic head 114 is retracted, suppressing evaporation of oil and the like, and suppressing deterioration of the magnetic head 114 . Further, while the magnetic head 114 is being retracted, the possibility that the HD 111 will be damaged or destroyed even if vibration or impact is applied from the outside is reduced. As a result, the HD 111 can be protected even when access to the HD 111 continues at high frequency.

<Flow chart of the first embodiment>
Next, processing of the first embodiment will be described based on a flowchart. FIG. 7 is a flow chart showing the processing of the first embodiment.
The HDD controller 200 starts measuring the HD access time when the magnetic head 114 starts accessing the data recording area 111a of the HD 111 (S1). The HD access time is measured by a specified time measurement timer. The specified time measurement timer may be realized by the timer function of the CPU 201, or may be implemented by implementing a timer IC in the HDD controller 200. FIG. The specified time measurement timer of this embodiment is reset when the specified time has been measured and by a reset command.

The HDD controller 200 determines whether or not the HDD access time has exceeded a specified time (S2). The specified time is, for example, 60 minutes, and is pre-stored in the MEM-H202 as described above. The HDD controller 200 determines whether or not the access to the HD 111 by the magnetic head 114 has ended when the specified time has not passed (S2, No) (S3). For example, the HDD controller 200 determines that the access has ended when all the data to be written to the data recording area 111a has been written, or when all the data to be read from the data recording area 111a has been read. . When the HDD controller 200 determines that the access has not ended (S3, No), the HDD controller 200 proceeds to the process of S2 to determine whether or not the specified time has passed, and when it determines that the access has ended (S3, Yes) Reset the stipulated time measurement timer (S4) and end the series of processes.
The HDD controller 200 issues an HD access suspension command when the specified time is exceeded (S2, Yes) (S5). For example, the CPU 201 outputs an HD access suspension command to the control unit 210 . As a result, the control unit 210 controls the write/read function module 222 to interrupt access to the data recording area 111 a of the HD 111 by the magnetic head 114 .

Next, the HDD controller 200 holds the address at the time of access interruption in memory (for example, the cache 201a of the CPU 201) (S6). After that, the HDD controller 200 retracts the magnetic head 114 to the retraction position (home position) P1 (S7). For example, the CPU 201 outputs a magnetic head evacuation command to the control section 210 . Accordingly, the control section 210 controls the head retraction/return function module 224 to drive the actuator 116 . By driving the actuator 116, the arm 115 rotates, and the magnetic head 114 on the data recording area 111a moves to the retracted position P1 and shifts to the idle state. In the idle state, for example, the operation of the mechanical mechanism including the magnetic head 114 is stopped and the rotational speed of the HD 111 is reduced. Therefore, in the idle state, the internal temperature of HDD 110 decreases with time.

The HDD controller 200 starts measuring the retraction time when the magnetic head 114 retracts to the retraction position P1 (shifts to the idle state) (S8). The save time is set to the time (for example, 1 minute) required for the internal temperature of the HDD 110 to drop, and is measured by the save time measurement timer. The evacuation time measurement timer may be implemented by, for example, the timer function of the CPU 201, or a timer IC may be implemented in the HDD controller 200. FIG. The save time measurement timer of the present embodiment is reset when the save time has been measured and by a reset command.
The HDD controller 200 monitors whether or not the retraction time has elapsed using the retraction time measurement timer (S9), and retracts the magnetic head 114 to the retraction position P1 until the retraction time has elapsed (S9, No).

When the save time has passed (S9, Yes), the HDD controller 200 reads the address at the time of access interruption held in step S6 from the memory (S10), and resumes access to the data recording area 111a by the magnetic head 114 (S11). ). For example, the CPU 201 outputs a magnetic head return command to the control unit 210 . Accordingly, the control unit 210 controls the head evacuation/return function module 224 and the head positioning function module 223 to drive the actuator 116 . By driving the actuator 116, the arm 115 rotates and the magnetic head 114 on the data recording area 111a returns to the position at which the access was interrupted. Also, the CPU 201 outputs an access resume command to the control unit 210 . Accordingly, the control unit 210 controls the write/read function module 222 to cause the magnetic head 114 to access the data recording area 111a.
After that, the HDD controller 200 shifts to the process of step S1, starts measuring the HD access time, and performs the above-described series of processes until the access to the data recording area 111a by the magnetic head 114 is completed (S3, Yes). conduct.

As is clear from the above description, in the first embodiment, when the continuous access time to the data recording area 111a by the magnetic head 114 exceeds the specified time T1, the magnetic head 114 determines that the evacuation condition is satisfied. is moved to the evacuation position P1, and when the evacuation time exceeds the specified time T2, it is determined that the return condition is met, the magnetic head 114 is moved to the data recording area 111a, and the access to the data recording area 111a is resumed. Therefore, the HD 111 can be protected even when access to the HD 111 continues at a high frequency.

<Control of Second Embodiment>
Next, a second embodiment will be described. The second embodiment is a modification of the first embodiment, in which data transmitted from the ASIC 105 is accumulated in a memory such as the cache 201a of the CPU 201 while the magnetic head 114 is retracted, and after the return condition is satisfied, is characterized in that the data stored in the memory are sequentially written to the data recording area 111a.

FIG. 8 is a diagram for explaining control of the second embodiment. Regarding the second embodiment and third to sixth embodiments described later, contents common to the already described embodiments will be briefly described.
As shown in FIG. 8, in the second embodiment, the HDD controller 200 starts writing data to the data recording area 111a at time t10, and the continuous writing time to the data recording area 111a by the magnetic head 114 is defined. At time t11 after time T11 (for example, 60 minutes), it is determined that the retraction condition is met, and the magnetic head 114 is retracted to the retraction position P1. The HDD controller 200 accumulates the data transmitted from the ASIC 105 in the cache 201a of the CPU 201 and the MEM-H 202 while the magnetic head 114 is retracting, in other words, until the retraction time elapses the specified time T12 (for example, 1 minute). . The HDD controller 200 determines that the return condition is satisfied at time t12 after the specified time T12 has elapsed, moves the magnetic head 114 to the data recording area 111a, and writes data to the data recording area 111a in order from the data accumulated in the cache 201a. enter.

When the HDD controller 200 performs the above-described control, the temperature inside the HDD 110 drops while the magnetic head 114 is retracted, as in the first embodiment, and deterioration of the magnetic head 114 due to evaporation of oil or the like is suppressed. The HD 111 can be protected even when access to the HD 111 continues frequently. Furthermore, in the second embodiment, since the data from the ASIC 105 is stored in the cache 201a (memory) while the magnetic head 114 is retracted, it is possible to suppress inconveniences such as loss of data to be written, thereby improving the processing efficiency. can be made.

<Flow chart of the second embodiment>
Next, processing of the second embodiment will be described based on a flowchart. FIG. 9 is a flow chart showing the processing of the second embodiment.
As shown in FIG. 9, when the magnetic head 114 starts writing data to the data recording area 111a of the HD 111, the HDD controller 200 starts measuring the writing time to the HD 111 (S21). The write time is measured by, for example, a specified time measurement timer or the like as described in the first embodiment.

The HDD controller 200 determines whether or not the write time has exceeded the specified time (S22). is completed (S23). When the HDD controller 200 determines that the writing is not completed (S23, No), it proceeds to the process of S22 to determine whether or not the specified time has passed. Yes) The specified time measurement timer is reset (S24) and the series of processes is terminated.
The HDD controller 200 issues a command to suspend writing to the HD 111 when the prescribed time has passed (S22, Yes) (S25). For example, the CPU 201 outputs a write suspend command to the control unit 210 . As a result, the control unit 210 controls the write/read function module 222 to interrupt writing to the data recording area 111 a of the HD 111 by the magnetic head 114 .

Next, the HDD controller 200 holds the address at the time of writing interruption in a memory (for example, the cache 201a of the CPU 201) (S26), and switches the data transmitted from the ASIC 105 to the cache 201a (S27). As a result, the data is accumulated in the cache 201a. After that, the HDD controller 200 retracts the magnetic head 114 to the retraction position P1 (home position) (S28) and starts measuring the retraction time (S29). These processes are the same as those of the first embodiment (S7, S8).

The HDD controller 200 monitors whether or not the evacuation time has elapsed (S30), and until the evacuation time has elapsed, the magnetic head 114 is withdrawn to the evacuation position P1 (S30, No), and there is space in the cache 201a. (S31). When there is space in the cache 201a (S31, No), the HDD controller 200 shifts to the process of step S30 and monitors whether or not the saving time has elapsed, and when there is no space in the cache 201a (S31, Yes). The evacuation time measurement timer is reset (S32).

When the save time has passed (S30, Yes), or after resetting the save time measurement timer (S32), the HDD controller 200 reads from the memory the address at the time of access interruption held in step S26 (S33). The data writing to the data recording area 111a by is restarted (S34). When resuming writing, HDD controller 200 writes to data recording area 111a in order from the data accumulated in cache 201a. After that, the HDD controller 200 shifts to the process of step S21, starts measuring the write time to the HD 111, and performs the above-described series of processes until all the data to be written to the data recording area 111a is written. (S23, Yes) Perform.

As is clear from the above description, in the second embodiment, when the continuous writing time to the data recording area 111a by the magnetic head 114 exceeds the specified time T11, the magnetic head 114 determines that the evacuation condition is met. is moved to the evacuation position P1, and when the evacuation time exceeds the specified time T12, it is determined that the return condition is met, the magnetic head 114 is moved to the data recording area 111a, and the access to the data recording area 111a is restarted. Therefore, the HD 111 can be protected even when data writing to the HD 111 continues.

Furthermore, in the second embodiment, the data transmitted from the ASIC 105 is stored in the cache 201a while the magnetic head 114 is retracted, and the data stored in the cache 201a is sequentially written to the data recording area 111a. can be made.

<Control of the third embodiment>
In the first and second embodiments described above, the magnetic head 114 is triggered when the continuous access time or continuous write time to the data recording area 111a of the magnetic head 114 exceeds the prescribed times T1 and T11. was retracted to the retracted position P1, but the configuration is not limited to this. The third embodiment is characterized in that the magnetic head 114 is retracted to the retraction position P1 when the amount of data continuously written by the magnetic head 114 exceeds a specified value.

FIG. 10 is a diagram explaining control of the third embodiment. As shown in FIG. 10, in the third embodiment, the HDD controller 200 starts writing data to the data recording area 111a at time t20, and the amount of data continuously written to the data recording area 111a by the magnetic head 114 ( At time t21 when the total amount of writing exceeds a specified amount, it is determined that the retraction condition is met, and the magnetic head 114 is retracted to the retraction position P1. Note that the reference value of the write data amount used for determination can be set to an arbitrary value, and is stored in the MEM-H202 or the like.
The HDD controller 200 determines that the return condition is met at time t22 when the retraction time of the magnetic head 114 has passed the specified time T21, moves the magnetic head 114 to the data recording area 111a, and transfers the data to the data recording area 111a. Resume writing.

When the HDD controller 200 performs the above-described control, the temperature in the HDD 110 drops while the magnetic head 114 is retracted, thereby suppressing deterioration of the magnetic head 114 due to vaporization of oil or the like, as in the first and second embodiments. Therefore, the HD 111 can be protected even when large-sized data are written to the HD 111 continuously.

<Flow chart of the third embodiment>
Next, processing of the third embodiment will be described based on a flowchart. FIG. 11 is a flow chart showing the processing of the third embodiment.
As shown in FIG. 11, the HDD controller 200 detects the data amount (size) of data transmitted from the ASIC 105 (S41). The amount of data can be detected, for example, by referring to the header portion of the data, but may be detected by other methods. The HDD controller 200 causes the magnetic head 114 to write data to the data recording area 111a, and measures the amount of written data (S42).

The HDD controller 200 determines whether or not the amount of written data exceeds the specified value (S43), and when the specified value is not exceeded (S43, No), writing of all data to the data recording area 111a is completed. (S44). When the HDD controller 200 determines that the writing has not been completed (S44, No), it shifts to the processing of S42, writes data and measures the amount of written data, and writes all the data to the data recording area 111a. is completed (S44, Yes), the series of processes is terminated.
When the amount of written data exceeds the specified value (S43, Yes), the HDD controller 200 issues a write suspension command to the HD 111 (S45), and holds the address at the time of write suspension in a memory (for example, the cache 201a of the CPU 201). (S46). After that, the HDD controller 200 retracts the magnetic head 114 to the retraction position (home position) P1 (S47) and starts measuring the retraction time (S48). The HDD controller 200 monitors whether or not the retraction time has elapsed (S49), and retracts the magnetic head 114 to the retraction position P1 until the retraction time has elapsed (S49, No). When the save time has passed (S49, Yes), the HDD controller 200 reads from the memory the address at the time of access interruption held in step S46 (S50), and resumes writing to the data recording area 111a by the magnetic head 114 (S51). ). These processes are the same as those of the first embodiment (S5 to S11).
After that, the HDD controller 200 shifts to the process of step S42 to write data and measure the amount of written data, and repeats the above-described series of processes until writing of all data to the data recording area 111a is completed ( S44, Yes) Perform.

As is clear from the above description, in the third embodiment, when the amount of continuous writing to the data recording area 111a by the magnetic head 114 exceeds a specified amount, it is determined that the evacuation condition is satisfied, and the magnetic head 114 is turned off. When the magnetic head 114 is moved to the retraction position P1 and the retraction time exceeds the specified time T21, it is determined that the return condition is met, the magnetic head 114 is moved to the data recording area 111a, and the access to the data recording area 111a is resumed. Therefore, the HD 111 can be protected even when large-sized data is written to the HD 111 continuously.

<Control of the fourth embodiment>
Next, a fourth embodiment will be described. The fourth embodiment is a modification of the third embodiment, in which data transmitted from the ASIC 105 is accumulated in a memory such as the cache 201a of the CPU 201 while the magnetic head 114 is retracted, and after the return condition is satisfied, is characterized in that the data stored in the memory are sequentially written to the data recording area 111a.
FIG. 12 is a diagram for explaining control in the fourth embodiment. As shown in FIG. 12, in the fourth embodiment, the HDD controller 200 starts writing data to the data recording area 111a at time t30, and the amount of data continuously written to the data recording area 111a by the magnetic head 114 is At time t31 when the specified amount is exceeded, it is determined that the retraction condition is satisfied, and the magnetic head 114 is retracted to the retraction position P1.

The HDD controller 200 accumulates the data transmitted from the ASIC 105 in the cache 201a of the CPU 201 and the MEM-H 202 until the evacuation time of the magnetic head 114 passes the specified time T31. The HDD controller 200 determines that the return condition is satisfied at time t32 after the specified time T31 has elapsed, moves the magnetic head 114 to the data recording area 111a, and writes data to the data recording area 111a in order from the data accumulated in the cache 201a and the like. enter.
When the HDD controller 200 performs the above-described control, the temperature in the HDD 110 drops while the magnetic head 114 is retracted, and deterioration of the magnetic head 114 due to vaporization of oil or the like is suppressed. The HD 111 can be protected even when writing data. In addition, since the data from the ASIC 105 is stored in the cache 201a (memory) while the magnetic head 114 is retracted, problems such as loss of data to be written can be suppressed, and processing efficiency can be improved.

<Flow chart of the fourth embodiment>
Next, processing of the fourth embodiment will be described based on a flowchart. FIG. 13 is a flow chart showing the processing of the fourth embodiment.
As shown in FIG. 13, the HDD controller 200 detects the amount of data transmitted from the ASIC 105 (S61), writes data to the data recording area 111a by the magnetic head 114, and detects the amount of written data. is measured (S62). The HDD controller 200 determines whether or not the amount of written data has exceeded a specified value (S63). When the prescribed value is not exceeded (S63, No), the HDD controller 200 determines whether writing of all data to the data recording area 111a is completed (S64). When the HDD controller 200 determines that the writing has not been completed (S64, No), it shifts to the processing of S62, writes data, measures the amount of written data, and writes all the data to the data recording area 111a. is completed (S64, Yes), the series of processes is terminated. When the amount of written data exceeds the specified value (S63, Yes), the HDD controller 200 issues a write interruption command to the HD 111 (S65), and holds the address at the time of writing interruption in the memory (S66). These processes are the same as those of the third embodiment (S41 to S45).

Next, the HDD controller 200 switches the data transmitted from the ASIC 105 to storage in the cache 201a (S67). As a result, the data is accumulated in the cache 201a. After that, the HDD controller 200 retracts the magnetic head 114 to the retraction position P1 (S68) and starts measuring the retraction time (S69). The HDD controller 200 monitors whether or not the evacuation time has elapsed (S70), and causes the magnetic head 114 to withdraw to the evacuation position P1 until the evacuation time elapses (S70, No), and the cache 201a is empty. (S71). When there is space in the cache 201a (S71, No), the HDD controller 200 shifts to the process of step S70 and monitors whether or not the saving time has elapsed, and when there is no space in the cache 201a (S71, Yes). The evacuation time measurement timer is reset (S72). When the save time has elapsed (S70, Yes) or after resetting the save time measurement timer (S72), the HDD controller 200 reads the address at the time of access interruption held in step S66 from the memory (S73), 114 resumes writing to the data recording area 111a (S74). These processes are the same as those of the second embodiment (S27 to S34).
After that, the HDD controller 200 shifts to the process of step S62 to write data and measure the amount of written data. (S64, Yes) Perform.

As is clear from the above description, in the fourth embodiment, it is possible to protect the HD 111 even when writing large-sized data to the data recording area 111a. In addition, since the data from the ASIC 105 is accumulated while the magnetic head 114 is retracted, it is possible to prevent the problem of lack of data to be written, thereby improving the processing efficiency.

<Control of the fifth embodiment>
In the first to fourth embodiments described above, whether or not the save condition is satisfied is determined based on the continuous access time and the continuous write amount by the magnetic head 114, but the configuration is not limited to these. The fifth embodiment is characterized in that whether or not the evacuation condition is satisfied is determined based on the internal temperature of the HDD 110 (temperature inside the housing 118).
FIG. 14 is a diagram for explaining control of the fifth embodiment. As shown in FIG. 14, in the fifth embodiment, the HDD controller 200 starts accessing the data recording area 111a at time t40, and at time t41 when the internal temperature of the HDD 110 based on the SMART information exceeds the upper limit temperature, is established, and the magnetic head 114 is retracted to the retraction position P1. HDD controller 200 determines that the return condition is met at time t42 when the internal temperature of HDD 110 becomes equal to or lower than the return temperature lower than the upper limit temperature, and moves magnetic head 114 to data recording area 111a. to resume access.

When the HDD controller 200 performs the above-described control, the temperature in the HDD 110 decreases while the magnetic head 114 is retracted, and deterioration of the magnetic head 114 due to vaporization of oil or the like is suppressed. The HD 111 can be protected even when it continues.

<Flow chart of the fifth embodiment>
Next, processing of the fifth embodiment will be described based on a flowchart. FIG. 15 is a flow chart showing the processing of the fifth embodiment.
As shown in FIG. 15, HDD controller 200 acquires the internal temperature of HDD 110 based on SMART information (S81), and determines whether the internal temperature exceeds a specified upper limit temperature (S82). The upper limit temperature is determined for each type of HDD 110 and stored in advance in the MEM-H 202, for example. When the internal temperature does not exceed the upper limit temperature (S82, No), the HDD controller 200 determines whether the magnetic head 114 has finished accessing the HD 111 (S83). When the HDD controller 200 determines that the access has not ended (S83, No), it proceeds to the process of S81 to acquire the internal temperature, and when it determines that the access has ended (S83, Yes), it performs a series of processes. finish.

When the internal temperature exceeds the upper temperature limit (S82, Yes), the HDD controller 200 issues an access suspension command to the HD 111 (S84), and stores the address at the time of access suspension in memory (S85). After that, the HDD controller 200 retracts the magnetic head 114 to the retracted position P1 (home position) (S86), and acquires the internal temperature of the HDD 110 (S87). The HDD controller 200 monitors whether the internal temperature has dropped below the return temperature, which is lower than the upper limit temperature (S88), and continues to evacuate the magnetic head 114 to the save position P1 until the internal temperature drops below the return temperature (S88). , No). When the internal temperature drops below the recovery temperature (S88, Yes), the HDD controller 200 reads the address at the time of access interruption held in step S85 from the memory (S89), and stops the magnetic head 114 from accessing the data recording area 111a. Resume (S90).
After that, the HDD controller 200 shifts to the process of step S81, acquires the internal temperature of the HDD 110, and performs the series of processes described above until the access to the data recording area 111a by the magnetic head 114 is completed (S83, Yes). .

As is clear from the above description, in the fifth embodiment, when the internal temperature of the HDD 110 exceeds the upper limit temperature, it is determined that the evacuation condition is met, the magnetic head 114 is moved to the evacuation position P1, and the internal temperature of the HDD 110 is When the temperature drops below the recovery temperature, it is determined that the recovery condition is satisfied, the magnetic head 114 is moved to the data recording area 111a, and access to the data recording area 111a is resumed. The HD 111 can be protected even when it continues.

<Control of the sixth embodiment>
Next, a sixth embodiment will be described. The sixth embodiment is a modification of the fifth embodiment, in which data transmitted from the ASIC 105 is stored in a memory such as the cache 201a of the CPU 201 while the magnetic head 114 is retracted, and after the return condition is established, is characterized in that the data stored in the memory are sequentially written to the data recording area 111a.
FIG. 16 is a diagram for explaining control of the sixth embodiment. As shown in FIG. 16, in the sixth embodiment, the HDD controller 200 starts writing to the data recording area 111a at time t50, and at time t51 when the internal temperature of the HDD 110 exceeds the upper limit temperature, it is assumed that the save condition is met. Then, the magnetic head 114 is retracted to the retraction position P1. The HDD controller 200 accumulates the data transmitted from the ASIC 105 in the cache 201a of the CPU 201 and the MEM-H 202 until the internal temperature of the HDD 110 drops below the recovery temperature. The HDD controller 200 determines that the return condition is met at time t52 when the internal temperature of the HDD 110 drops below the return temperature, moves the magnetic head 114 to the data recording area 111a, and sequentially reads the data from the data accumulated in the cache 201a and the like. Write to the recording area 111a.

When the HDD controller 200 performs the above-described control, the temperature in the HDD 110 drops while the magnetic head 114 is retracted, and deterioration of the magnetic head 114 due to vaporization of oil or the like is suppressed. The HD 111 can be protected even when writing data. In addition, since the data from the ASIC 105 is stored in the cache 201a (memory) while the magnetic head 114 is retracted, problems such as loss of data to be written can be suppressed, and processing efficiency can be improved.

<Flow chart of the sixth embodiment>
Next, processing of the sixth embodiment will be described based on a flowchart. FIG. 17 is a flow chart showing the processing of the sixth embodiment.
As shown in FIG. 17, HDD controller 200 acquires the internal temperature of HDD 110 based on SMART information (S101), and determines whether the internal temperature exceeds a specified upper limit temperature (S102). When the internal temperature does not exceed the upper limit temperature (S102, No), the HDD controller 200 determines whether writing of all data to be written to the data recording area 111a is completed (S103). When the HDD controller 200 determines that the writing is not completed (S103, No), it proceeds to the process of S101 to acquire the internal temperature of the HDD 110, and when it determines that the writing is completed (S103, Yes), End a series of processes.

When the internal temperature exceeds the upper limit temperature (S102, Yes), the HDD controller 200 issues a write suspension command to the HD 111 (S104), and holds the address at the time of write suspension in memory (for example, the cache 201a of the CPU 201). (S105). Thereafter, the HDD controller 200 switches the data transmitted from the ASIC 105 to storage in the cache 201a (S106), retracts the magnetic head 114 to the retracted position P1 (home position) (S107), and obtains the internal temperature of the HDD 110. (S108). The HDD controller 200 monitors whether the internal temperature has dropped below the recovery temperature lower than the upper limit temperature (S109), and retracts the magnetic head 114 to the retraction position P1 until the internal temperature drops below the recovery temperature (S109, No), and monitors whether or not there is space in the cache 201a (S110). When there is space in the cache 201a (S101, No), the HDD controller 200 shifts to the process of step S108 and monitors whether the internal temperature of the HDD 110 has dropped below the recovery temperature.

When the internal temperature of the HDD 110 drops below the recovery temperature (S109, Yes), or when there is no more space in the cache 201a (S110, Yes), the HDD controller 200 restores the address at the time of access interruption held in step S105. is read from the memory (S111), and writing to the data recording area 111a by the magnetic head 114 is resumed (S112). At the time of restart, HDD controller 200 sequentially writes data accumulated in cache 201a to data recording area 111a. After that, the HDD controller 200 shifts to the process of step S101, acquires the internal temperature of the HDD 110, and performs the above-described series of processes until all the data to be written into the data recording area 111a is completed (S103, Yes) do.

As is clear from the above description, in the sixth embodiment, it is determined that the retraction condition and return condition are satisfied based on the internal temperature of the HDD 110, and the retraction and return of the magnetic head 114 are controlled. HD 111 can be protected even when data continues to be written to. Furthermore, since the data transmitted from the ASIC 105 is stored in the cache 201a while the magnetic head 114 is retracted, and the data stored in the cache 201a is sequentially written to the data recording area 111a, the efficiency of processing can be improved.

<About Modifications>
In the above-described embodiment, the image forming apparatus (MFP 1) was exemplified as the information processing apparatus including the HDD 110, but the present invention is not limited to this. The information processing device includes, for example, a PJ (Projector), an IWB (Interactive White Board), an output device such as a digital signage, a HUD (Head Up Display) device, Industrial machines, imaging devices, sound collectors, medical equipment, network appliances, automobiles (connected cars), mobile phones, smartphones, tablet terminals, game machines, PDAs (Personal Digital Assistants), digital cameras, wearable PCs, desktop PCs, etc. , HDD 110 .

Each function of the above-described embodiments can be implemented by one or more processing circuits. Here, the "processing circuit" in this specification means a processor programmed by software to perform each function, such as a processor implemented by an electronic circuit, or a processor designed to perform each function described above. Devices such as ASICs, DSPs (Digital Signal Processors), FPGAs (Field Programmable Gate Arrays) and conventional circuit modules are included.

[Summary of Embodiments, Actions, and Effects of the Present Invention]
<First embodiment>
The HDD 110 according to this aspect includes a rotating HD 111 having a data recording area 111a in which data is magnetically recorded, a magnetic head 114 capable of freely accessing the data recording area 111a while the HD 111 is rotating, and a magnetic head 114 for data recording. Actuator 116 for moving between recording area 111a and evacuation position P1 outside data recording area 111a, and movement of magnetic head 114 to evacuation position P1 when evacuation conditions are established during access to data recording area 111a by magnetic head 114. and an HDD controller 200 (control means) for moving the magnetic head 114 to the data recording area 111a and restarting access to the data recording area 111a when a return condition is satisfied while the magnetic head 114 is retracted. Characterized by
According to the HDD 110 according to this aspect, it is possible to protect the HD 111 even when access to the HD 111 continues at a high frequency.

<Second embodiment>
The HDD 110 according to this aspect is characterized in that the HDD controller 200 (control means) determines that the evacuation condition is established when the continuous access time to the data recording area 111a by the magnetic head 114 exceeds a specified time. do.
According to the HDD 110 according to this aspect, the magnetic head 114 is moved to the evacuation position P1 when the continuous access time to the data recording area 111a by the magnetic head 114 exceeds the specified time, so the HD 111 is effectively protected. can do.

<Third Embodiment>
In the HDD 110 according to this aspect, the HDD controller 200 (control means) determines that the save condition is met when the total amount of data continuously written to the data recording area 111a by the magnetic head 114 exceeds a specified amount. It is characterized by
According to the HDD 110 according to this aspect, the magnetic head 114 is moved to the retracted position P1 when the total amount of data continuously written to the data recording area 111a by the magnetic head 114 exceeds the specified amount. can be effectively protected.

<Fourth embodiment>
In the HDD 110 according to this aspect, the HDD controller 200 (control means) is characterized in that the return condition is satisfied when the retraction time of the magnetic head 114 has passed a specified time.
According to the HDD 110 according to this aspect, access to the data recording area 111a is resumed when the retraction time of the magnetic head 114 has passed the specified time, so the HD 111 can be effectively protected.

<Fifth embodiment>
The HDD 110 according to this aspect includes a housing 118 containing the HD 111, the magnetic head 114, and the actuator 116, and the HDD controller 200 (control means) detects that the evacuation condition is satisfied when the temperature inside the housing 118 exceeds the upper limit temperature. I judge.
According to the HDD 110 according to this aspect, the magnetic head 114 is moved to the retracted position P1 when the temperature inside the housing 118 exceeds the upper limit temperature, so the HD 111 can be effectively protected.

<Sixth Embodiment>
The HDD 110 according to this aspect is characterized in that the HDD controller 200 (control means) determines that the return condition is met when the temperature inside the housing 118 drops below the return temperature, which is lower than the upper limit temperature.
According to the HDD 110 according to this aspect, access to the data recording area 111a is resumed when the temperature inside the housing 118 drops below the recovery temperature, so the HD 111 can be effectively protected.

<Seventh embodiment>
The HDD 110 according to this aspect is characterized in that the HDD controller 200 (control means) acquires the temperature inside the housing 118 from SMART (Self-Monitoring Analysis and Reporting Technology) information.
According to the HDD 110 according to this aspect, since the temperature inside the housing 118 is acquired from the SMART information, the temperature inside the housing 118 can be easily acquired.

<Eighth Embodiment>
The HDD 110 according to this aspect includes a memory that stores data before being recorded in the data recording area 111a. The HDD controller 200 (control means) causes the data to be stored in the memory after the saving condition is The data is recorded in the data recording area 111a in order from the data stored in the memory after establishment.
According to the HDD 110 according to this aspect, it is possible to suppress the inconvenience of lack of data to be written, and to improve the efficiency of processing.

<Ninth embodiment>
In the HDD 110 according to this aspect, the HDD controller 200 (control means) moves the magnetic head 114 from the retracted position P1 to the data recording area 111a when the upper limit amount of data is stored in the memory before the return condition is satisfied, and the memory is restored. is recorded in the data recording area 111a in order from the data stored in .
According to the HDD 110 according to this aspect, even before the return condition is satisfied, when the upper limit amount of data is stored in the memory, the data is recorded in the data recording area 111a. It is possible to improve the efficiency of processing.

<Tenth embodiment>
The information processing apparatus according to this aspect is characterized by including the HDD 110 according to each aspect described above.
According to the information processing apparatus according to this aspect, it is possible to protect the HD 111 provided in the HDD 110 even when access to the HD 111 provided in the HDD 110 continues at a high frequency.

<Eleventh embodiment>
In this embodiment, a rotating HD 111 having a data recording area 111a in which data is magnetically recorded, a magnetic head 114 capable of freely accessing the data recording area 111a while the HD 111 is rotating, and the magnetic head 114 in the data recording area 111a. and an actuator 116 moved between the actuator 116 and a retraction position P1 outside the data recording area 111a. a retraction step of moving the magnetic head 114 to the retraction position P1 based on the establishment of the retraction condition; and a return step of moving the magnetic head 114 from the retracted position P1 to the data recording area 111a to restart access to the data recording area 111a.
According to the control method of the HDD 110 according to this aspect, the HD 111 can be protected even when the access to the HD 111 continues at a high frequency.

<Twelfth embodiment>
A program according to this aspect is characterized by causing a computer to execute each step in the hard disk drive control method described above.
According to the program according to this aspect, it is possible to protect the HD 111 even when access to the HD 111 continues at a high frequency.

DESCRIPTION OF SYMBOLS 1... MFP, 110... HDD, 111... HD, 111a... Data recording area, 114... Magnetic head, 115... Arm, 116... Actuator, 117... Temperature sensor, 118... Housing, 200... HDD controller, 210... Control part, 221...Disk rotation function module 222...Write/read function module 223...Head positioning function module 224...Head evacuation/return function module P1, P2...Evacuation position

Japanese Patent Laid-Open No. 2018-120376

Claims (11)

a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
When a retraction condition is met during access to the data recording area by the magnetic head, the magnetic head is moved to the retraction position, and when a return condition is met during retraction of the magnetic head, the magnetic head is moved to the data recording area. a control means for moving and restarting access to the data recording area;
with
The control means is
1. A hard disk drive according to claim 1, wherein it is determined that said save condition is met when the time of continuous access to said data recording area by said magnetic head exceeds a specified time. a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
When a retraction condition is met during access to the data recording area by the magnetic head, the magnetic head is moved to the retraction position, and when a return condition is met during retraction of the magnetic head, the magnetic head is moved to the data recording area. a control means for moving and restarting access to the data recording area;
with
The control means is
1. A hard disk drive according to claim 1, wherein it is determined that said save condition is established when a total amount of data continuously written to said data recording area by said magnetic head exceeds a specified amount. a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
When a retraction condition is met during access to the data recording area by the magnetic head, the magnetic head is moved to the retraction position, and when a return condition is met during retraction of the magnetic head, the magnetic head is moved to the data recording area. a control means for moving and restarting access to the data recording area;
with
The control means is
A hard disk drive , wherein it is determined that the return condition is established when the retraction time of the magnetic head has passed a specified time . a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
When a retraction condition is met during access to the data recording area by the magnetic head, the magnetic head is moved to the retraction position, and when a return condition is met during retraction of the magnetic head, the magnetic head is moved to the data recording area. a control means for moving and restarting access to the data recording area;
a memory for storing the data before being recorded in the data recording area;
with
The control means is
A hard disk drive, wherein the data is stored in the memory after the save condition is satisfied, and the data stored in the memory is recorded in the data recording area in order after the return condition is satisfied. The control means is
When the upper limit amount of data is stored in the memory before the return condition is established, the magnetic head is moved from the retracted position to the data recording area, and the data is stored in the memory in order from the data recording area. 5. The hard disk drive according to claim 4 , wherein the recording is performed on the . An information processing apparatus comprising the hard disk drive according to claim 1 . a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
A control method for a hard disk drive comprising
a retraction step of determining whether or not a retraction condition is satisfied while the magnetic head is accessing the data recording area, and moving the magnetic head to the retraction position based on the satisfaction of the retraction condition;
It is determined whether or not a return condition is satisfied while the magnetic head is retracted, and the magnetic head is moved from the retracted position to the data recording area based on the satisfaction of the return condition to access the data recording area. a return step to resume
with
The method of controlling a hard disk drive, wherein in the saving step, it is determined that the saving condition is satisfied when a time of continuous access to the data recording area by the magnetic head exceeds a specified time. a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
A control method for a hard disk drive comprising
a retraction step of determining whether or not a retraction condition is satisfied while the magnetic head is accessing the data recording area, and moving the magnetic head to the retraction position based on the satisfaction of the retraction condition;
It is determined whether or not a return condition is satisfied while the magnetic head is retracted, and the magnetic head is moved from the retracted position to the data recording area based on the satisfaction of the return condition to access the data recording area. a return step to resume
with
The method of controlling a hard disk drive, wherein in the saving step, it is determined that the saving condition is satisfied when a total amount of data continuously written to the data recording area by the magnetic head exceeds a specified amount. . a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
A control method for a hard disk drive comprising
a retraction step of determining whether or not a retraction condition is satisfied while the magnetic head is accessing the data recording area, and moving the magnetic head to the retraction position based on the satisfaction of the retraction condition;
It is determined whether or not a return condition is satisfied while the magnetic head is retracted, and the magnetic head is moved from the retracted position to the data recording area based on the satisfaction of the return condition to access the data recording area. a return step to resume
with
A control method for a hard disk drive , wherein, in the return step, it is determined that the return condition is established when the retraction time of the magnetic head has passed a specified time. a rotating magnetic disk having a data recording area on which data is recorded by magnetism;
a magnetic head capable of freely accessing the data recording area during rotation of the magnetic disk;
an actuator for moving the magnetic head between the data recording area and a retracted position outside the data recording area;
a memory for storing the data before being recorded in the data recording area;
A control method for a hard disk drive comprising
a retraction step of determining whether or not a retraction condition is satisfied while the magnetic head is accessing the data recording area, and moving the magnetic head to the retraction position based on the satisfaction of the retraction condition;
It is determined whether or not a return condition is satisfied while the magnetic head is retracted, and the magnetic head is moved from the retracted position to the data recording area based on the satisfaction of the return condition to access the data recording area. a return step to resume
with
storing the data in the memory after the saving condition is satisfied in the saving step;
The method of controlling a hard disk drive, wherein in the return step, the data stored in the memory after the return condition is satisfied is sequentially recorded in the data recording area. 11. A program causing a computer to execute each step of the hard disk drive control method according to any one of claims 7 to 10 .

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