JP2000339854A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously record/reproduce input data of a high transfer rate by recording the input data of the high transfer rate in the outer periphery side medium of a disk recording medium and recording input data having a low transfer rate in the inner periphery side of a disk recording medium. SOLUTION: When a record command is inputted, it is judged by the expander of the name of a file to be recorded whether it is recording of data by a high transfer rate or recording of data by a low transfer rate. Therefore, in a hard disk device 1, in the case of recording data by the high transfer rate, that is, recording of an animation file, data from an AV device 2 is successively recorded in a cluster unit from the outer periphery side of a hard disk 3 which ca be accessed by the high transfer rate. On the other hand, for an inner periphery side of the hard disk 3 being hard to access data by the high transfer rate, data of the low transfer rate, that is, still picture data, text data, and the like are successively recorded from an inner periphery side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and can be applied to, for example, a removable hard disk drive for recording video signals. According to the present invention, input data such as moving image data at a high transfer rate is recorded in an outer peripheral area of a disc-shaped recording medium, and input data such as still image data at a low transfer rate is recorded on a disc-shaped recording medium. By recording in the inner area, even when a plurality of types of input data are mixed and recorded on a disk-shaped recording medium, it is possible to continuously record and reproduce high-speed input data.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for recording moving image data, a video tape recorder using a magnetic tape as a recording medium has been widely used. In such a video tape recorder, a video signal input in a time series which is moving image data and an audio signal accompanying the video signal are processed in a field unit or a frame unit of the video signal, and processed. Recording is performed diagonally on a magnetic tape running at a speed.

[0003] On the other hand, in a personal computer, an application program or the like is recorded using a hard disk device. In recent years, the hard disk device has been rapidly increased in density and reduced in size. It has been done.

In this hard disk device, the recording area of the hard disk is divided into a system entry area and a data area, a file input from an external device is recorded in the data area, and data necessary for accessing this data area is recorded. Record in the system entry area. Thus, in the hard disk device, a file management system is configured to manage data to be recorded / reproduced on a file basis, and to access the hard disk in response to a request from an external device.

[0005]

By recording and reproducing a video signal using a hard disk drive, it is considered that a recording device which is small in size and capable of recording for a long time can be produced. Further, it is considered that a recording / reproducing apparatus capable of carrying a desired image of a desired subject can be configured to be carried as in the case of a video tape recorder with a camera.

At this time, if the file management system used in the personal computer is applied to the hard disk device as it is, the editing system can be easily constructed by connecting the hard disk device to a personal computer or the like separately.

However, in a hard disk drive,
By rotating the hard disk by CAV (Constant Anguler Velocity), when the inner area is accessed, the data transfer speed at which recording and reproduction can be performed is lower than when the outer area is accessed. is there. Accordingly, when recording and reproducing moving image data in the hard disk device, there is a possibility that it is difficult to continuously record and reproduce moving image data in the inner peripheral area.

A method of securing a sufficient data transfer speed even in the inner peripheral area by increasing the rotation speed of the hard disk drive is conceivable. However, in this case, power consumption increases accordingly. In addition, when accessing the outer peripheral area, it is necessary to temporarily hold data to be used for recording and reproduction in a large-capacity memory and access the hard disk intermittently, thereby avoiding complicating the entire configuration. I can't get it.

In recent years, this type of recording / reproducing apparatus has been made capable of recording and reproducing not only moving image data but also still image data. Different types of such moving image data and still image data are available. When data is recorded on a hard disk, continuous moving image data is discretely recorded by fragmentation (data fragmentation) by repeatedly recording and deleting files. In the video data recorded in this way,
In this case, continuous recording and reproduction of moving image data is also required because it is necessary to repeat and repetitively perform seeking, and when recording, it is necessary to seek and record discrete free areas. There is a problem that becomes difficult.

[0010] In the case of editing a file of such moving image data and still image data, there is a problem that it becomes more difficult to record and reproduce further continuous moving image data due to further fragmentation. is there.

The present invention has been made in view of the above points, and when the file management is performed so that the file can be accessed in file units, even when a plurality of types of input data are mixed and recorded on a disk-shaped recording medium, the present invention is highly efficient. An object of the present invention is to propose a disk device capable of continuously recording and reproducing input data of a transfer speed.

[0012]

According to the first aspect of the present invention, in order to solve the above-mentioned problem, the present invention is applied to a disk device, in which input data of a high transfer rate is recorded in an outer peripheral area of a disk-shaped recording medium, The input data at a low transfer rate is recorded in the inner peripheral area of the disk-shaped recording medium.

According to the first aspect of the present invention, input data of a high transfer rate is recorded on an outer peripheral area of a disk-shaped recording medium, and input data of a low transfer rate is recorded on an inner peripheral area of a disk-shaped recording medium. By doing so, it is possible to allocate high transfer rate input data and low transfer rate input data to areas accessible by the high transfer rate and low transfer rate, respectively, thereby continuously inputting high transfer rate input data. It can be recorded and reproduced. Further, since the recording area is divided into the input data of the high transfer rate and the input data of the low transfer rate, fragmentation of the input data can be prevented in recording the input data of the high transfer rate. Thus, input data having a high transfer rate can be continuously recorded and reproduced.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of the Embodiment FIG. 2 is a block diagram showing a hard disk drive according to an embodiment of the present invention. This hard disk device 1
Is mounted on an imaging device, a set-top box, etc.,
It records various data output from these devices, and is detached from these devices to allow other AV devices,
While attached to a personal computer (PC),
The recorded data data is reproduced and output.

Here, these data data are composed of high transfer rate data having a relatively high transfer rate and low transfer rate data having a relatively low transfer rate. MPEG (Moving
Moving picture data compressed according to the format of Picture Experts Group) is assigned, and audio data, still picture data, and text data are assigned as low transfer rate data.

For this reason, the hard disk drive 1 is detachably held in an AV device 2 such as an image pickup device and a set-top box, and stores data and the like obtained by compressing video data and audio data in a predetermined format. Input and output are performed with the device 2 and the like, and control commands, status data, addresses, and the like accompanying input and output of these data are input and output with these devices. Further, this data is recorded on the hard disk 3, and the data recorded on the hard disk 3 is reproduced and output.

Here, as shown in FIG. 3, in the hard disk 3, tracks are formed concentrically on an information recording surface, and this information recording surface is concentrically divided into a plurality of zones 0-3. In each of the zones 0 to 3, the track is divided into a plurality of sectors by dividing the track by a predetermined length in the longitudinal direction. In the hard disk 3, the number of sectors per track is sequentially increased from the inner zone 3 and the information recording surface is applied by applying a zone bit recording technique of varying the recording frequency according to the zone. Has been made to be used efficiently.

The hard disk 3 zoned and sectorized in this way has a surface number of the information recording surface,
A physical address is set by a track number continuously allocated from the outer peripheral side of the information recording surface and a sector number for specifying a sector in each track. Further, an outer peripheral side of the information recording surface is set corresponding to the physical address. User data is file-managed by logical addresses that are sequentially set.

Here, a logical address is represented by a cluster number in units of a cluster formed by a set of a plurality of logical sectors. That is, the logical sector is an area corresponding to a recording unit of data set with the first area on the information recording surface (in this case, the outermost periphery) as 0 sector,
In this embodiment, one physical sector can be represented by the following equation in correspondence with one logical sector. Here, the surface number, the track number, and the sector number are based on physical addresses.

[0021]

(Equation 1)

In this embodiment, the logical sector is configured such that 512 bytes of data can be recorded in one logical sector in terms of user data, and one or a plurality of logical sectors constitute one cluster. It has been made. Note that one cluster is composed of powers of two (1, 2, 4, 8,...), And in a data area for recording user data, a cluster number which is a serial number with the head of the file area being 2 It has been made to be identified.

In the hard disk 3, user data is recorded and reproduced on a cluster basis.

FIG. 4 is a chart showing the format of the hard disk 3. The hard disk 3 divides an information recording surface into an inner peripheral area and an outer peripheral area, and the outer peripheral area is allocated to a system entry area. Further, the inner peripheral area is allocated to the data area.

In the data area, user data is recorded in units of clusters, and information of subdirectories is recorded. The data area can be accessed in cluster units based on the cluster number which is the address of each cluster. In this embodiment, the cluster number is indicated in a 4-digit hexadecimal format.

On the other hand, the system entry area further includes a boot area and a FAT (File Allocation Table).
ble) area and a directory area, and in the boot area, data necessary for starting up the hard disk 3 is recorded. On the other hand, FA
Address information and the like necessary for accessing user data recorded in the data area are recorded in the T area and the directory area.

That is, in the directory area, the file name of each file recorded in the data area, the cluster number of the first cluster which is the recording start position of each file, and the like are recorded. On the other hand, in the FAT area, a cluster number and the like of each cluster continuous with the first cluster of each file are recorded. Thereby, the hard disk 3 detects the first cluster number of the desired file name from the directory area, and then sequentially detects the cluster number following the first cluster number from the FAT area.
The address of a continuous cluster constituting one file can be detected.

In FIG. 4, when the file 1 is recorded in the clusters having the cluster numbers 1234h to 1240h in the data area, the code indicating the cluster number 1234h of the first block of the file 1 is changed to the directory area. , And the cluster number following the cluster number 1234h is sequentially recorded in the corresponding area of the FAT area. In FIG. 4, EOF (End Of File) is
This is identification information indicating the last block of one file.

More specifically, in the directory area, file management data having the configuration shown in FIG. 5 is recorded for each file recorded in the data area. That is, in the file management data, the file name is assigned to the first 8 bytes, and the extension of each file is assigned to the next 3 bytes. Data indicating the attribute of the file is assigned to the next 1 byte, and the next 10 bytes are assigned to the data for reservation. Another 2
The bytes are assigned to the data of the recording start time, the following two bytes are assigned to the data of the recording date and time, and the leading cluster number is assigned to the following two bytes. Note that data of the file length is allocated to the last four bytes.

On the other hand, in the FAT area (FIG. 4), an FAT address is allocated corresponding to the cluster number (cluster number) of the data area, and the cluster number of the cluster following each cluster is recorded. I have. As shown in FIG. 6, predetermined codes among the codes not allocated to these cluster numbers are allocated to identification information indicating a free area, a defective cluster, and EOF, respectively.

Thus, the hard disk 3 can access the FAT area to detect a free area in the data area.

Interface control circuit (IF control) 4
(FIG. 2), for example, SCSI (Small Computer System)
Interface) Controller, IDE (Intelligent Driv)
e Electronics) It is formed by a controller or the like, and constitutes an input / output circuit for data data, control commands, addresses, etc., to be transmitted to and received from the AV equipment 2. The buffer memory 5 temporarily holds data input and output between the hard disk control circuit 6 and the interface control circuit 4.

The servo circuit 7 drives the motor (M) 8 under the control of the hard disk control circuit 6, thereby driving the hard disk 3 to rotate under the condition of a constant angular velocity. The servo circuit 7 similarly drives the motor (M) 9 to seek the magnetic head, and further performs tracking control.

Under the control of the hard disk control circuit 6, the read data channel section 10 adds an error correction code to the user data input from the hard disk control circuit 6 during recording, and uses a method suitable for the characteristics of the recording / reproducing system. Encoding to generate bit-sequence data,
The magnetic head is driven by applying a zone bit recording technique using this data. At the time of reproduction, the read data channel section 10 performs signal processing on a reproduction signal obtained from the magnetic head to generate reproduction data, performs error correction processing on the reproduction data, reproduces user data, and executes the hard disk control circuit 6. Output to

The hard disk control circuit 6 is a controller for controlling the operation of the hard disk device 1.
The whole operation is controlled by analyzing a control command input from the interface control circuit 4 and executing a predetermined processing procedure according to the analysis result.

In this process, when the power supply is turned on, the hard disk control circuit 6 notifies the AV device 2 of the file management data so that the AV device 2 can access the file unit. Further, the hard disk control circuit 6 loads the data of the system entry area into the built-in memory. Thereby, the hard disk control circuit 6 accesses the data area based on the data of the loaded system entry area.

FIG. 1 shows that in such an access, A
6 is a flowchart showing a processing procedure of a hard disk control circuit 6 when a recording control command is input from a V device 2. In this processing procedure, the hard disk control circuit 6 proceeds from step SP1 to step SP2, and starts inputting data to be recorded from the AV device 2, and then proceeds to step SP3. Here, the hard disk control circuit 6 performs
After detecting the extension name of the file name, the process proceeds to step SP4, and it is determined from the extension name whether or not the data recorded on the hard disk 3 is a moving image file which is a file on the high transfer speed side.

If a positive result is obtained here, the hard disk control circuit 6 proceeds to step SP5, and determines whether or not data recording has been completed. Here, when a negative result is obtained at the start of recording, the hard disk control circuit 6 proceeds to step SP6, and accesses the data in the system entry area loaded into the memory, thereby starting the cluster of the data area from the outer peripheral side of the FAT area. Is detected as a FAT address set in a code indicating that the area is an empty area.

Subsequently, in step SP7, the hard disk control circuit 6 detects the FAT detected in step SP6.
The data input from the AV device 2 is recorded in the cluster of the data area corresponding to the address, and the data of the system entry area held in the memory is stored in the memory so as to correspond to the recording of the data. Is returned, and the process returns to step SP5. At the start of recording, the hard disk control circuit 6 also records the top cluster number and the like in the directory area.

As a result, the hard disk control circuit 6
The processing procedure of steps SP5-SP6-SP7-SP5 is sequentially repeated so that moving image data is sequentially recorded in cluster units from the outer peripheral side of the hard disk 3 as shown by an arrow AM in FIG. Updates the system entry area data stored in memory. When the recording of all the data is completed by sequentially recording the moving image data in this way, the hard disk control circuit 6 proceeds from step SP5 to step SP8 by obtaining a positive result in step SP5, and the system stored in the memory After updating the data in the entry area, the hard disk 3
Update the system entry area of step SP9
To end the processing procedure.

On the other hand, if the data input from the AV device 2 is data of a low transfer speed among data recorded on the hard disk 3 such as still image data and text data, the hard disk control circuit 6 proceeds to step SP4. A negative result is obtained in step SP4.
From step SP10. Here, the hard disk control circuit 6 determines whether or not the recording of the data has been completed. When a negative result is obtained at the start of the recording, the process proceeds to step SP11. Here, the hard disk control circuit 6 accesses the data in the system entry area loaded into the memory from the inner peripheral side of the FAT area.
The FAT address set in the code indicating that the cluster in the data area is a free area is detected.

Then, in step SP12, the hard disk control circuit 6 detects the F detected in step SP11.
AV is added to the cluster of the data area corresponding to the AT address.
The data input from the device 2 is recorded, and the data of the system entry area held in the memory is stored in the corresponding FAT so as to correspond to the recording of the data.
After updating the address area, the process returns to step SP12. At the start of recording, the hard disk control circuit 6 also records the top cluster number and the like in the directory area.

As a result, the hard disk control circuit 6
Steps SP10-SP11-SP12-SP10
7, the still image data and the like are sequentially recorded in cluster units from the inner peripheral side of the hard disk 3 as indicated by an arrow AS in FIG. 7, and the system entry stored in the memory corresponding to the recording is performed. Update area data. When the recording of all the data is completed by sequentially recording the still image data and the like in this manner, the hard disk control circuit 6 proceeds from step SP10 to step SP8 by obtaining a positive result in step SP10, and stores the data in the memory. After updating the data in the system entry area, the system entry area of the hard disk 3 is updated with the updated data, and the process proceeds to step SP9 to end the processing procedure.

(2) Operation of the Embodiment In the above configuration, the hard disk drive 1 (FIG. 2) is mounted on, for example, an imaging device, a set-top box, etc., and a recording control command is input from these AV devices 2. Then, data input following the control command is input to the read data channel unit 10 via the hard disk control circuit 6, where it is modulated in a format suitable for recording and the magnetic head is driven. Recorded on the hard disk 3.

When a playback control command is input while connected to these AV devices or detached from these devices and attached to other AV devices, playback commands obtained from the magnetic head are obtained. The signal is processed by the read data channel unit 10 to reproduce data recorded on the hard disk 3. The reproduced data is transmitted to the hard disk control circuit 6 and the interface control circuit 4.
Is output to the AV device 2 via the.

In recording / reproducing in this manner, when a recording command is input, the hard disk drive 1 records data at a high transfer rate or data at a low transfer rate, depending on the extension of the file name to be recorded. Is recorded.

Thus, in the hard disk drive 1, when data is recorded at a high transfer speed, data from the AV device 2 is sequentially recorded in cluster units from the outer peripheral side of the hard disk 3 accessible at the high transfer speed. On the other hand, on the inner side of the hard disk 3 where data access at a high transfer rate is difficult, data at a lower transfer rate is sequentially recorded from the inner side.

As a result, in the hard disk drive 1, the corresponding high transfer rate input data and low transfer rate input data can be allocated to the areas accessible by the high transfer rate and the low transfer rate, respectively. It becomes possible to continuously record and reproduce the input data of the speed.

In a file constituted by such low transfer speed data, the data amount is smaller than that of a file formed by high transfer speed data.
If these are mixed and the record deletion is repeated, data fragmentation will progress. However, in this embodiment, since the recording area is divided into a file based on the low transfer rate data and a file based on the high transfer rate data, the input data corresponding to the high transfer rate is recorded accordingly. Data fragmentation can be reduced, and thereby, the frequency of seek can be reduced, and high-speed data can be recorded and reproduced continuously.

(3) Effects of the Embodiment According to the above configuration, input data at a high transfer rate is recorded from the outer peripheral side of the hard disk, and input data at a low transfer rate is recorded from the inner peripheral side of the hard disk. By recording the high transfer rate and low transfer rate data on the outer and inner circumferences of the hard disk, respectively,
Even when a plurality of types of input data are mixed and recorded on the hard disk, input data having a high transfer rate can be continuously recorded and reproduced.

In recording the high transfer rate data and the low transfer rate data on the outer circumference and the inner circumference of the hard disk, respectively, the input data of the high transfer rate has a lower transfer rate than the outer circumference of the hard disk. The input data is recorded from the inner circumference of the hard disk, so that the information recording surface can be adaptively adjusted according to the data amount of the input high transfer rate and low transfer rate files. Desired data can be recorded by sorting the data.

(4) Other Embodiments In the above-described embodiment, the input data of a high transfer rate is from the outer circumference of the hard disk, and the input data of a low transfer rate is from the inner circumference of the hard disk. Although the case where the data of the high transfer rate and the data of the low transfer rate are recorded on the outer peripheral side and the inner peripheral side of the hard disk by recording is described, the present invention is not limited to this. As shown, the data area and the area corresponding to the system entry area may be divided into an outer peripheral area and an inner peripheral area, respectively, and high transfer rate data and low transfer rate data may be assigned to these areas. Good. In this way, input data can be recorded in clusters from the outer peripheral side toward the inner peripheral side as indicated by arrows AM and AS in the outer peripheral area and the inner peripheral area, respectively.

In the above-described embodiment, a case has been described in which the FAT area and the directory area are arranged in the system entry area, and a series of cluster numbers as concatenated file data are recorded in the data area. The present invention is not limited to this, and can be applied to a case where various areas are arranged on a recording medium as needed, or a case where linked file data is recorded in various areas. Can be. In this case, for example, a case where the directory area is managed separately with a root directory and a subdirectory, and a case where the directory area is arranged in the data area are conceivable.

Further, in the above-described embodiment, a case has been described in which data or the like indicating the reproduction order is recorded on the hard disk. However, the present invention is not limited to this. The data may be stored integrally, and for example, a nonvolatile memory may be incorporated and recorded in the nonvolatile memory.

Further, in the above-described embodiment, the case where moving image data, still image data, and text data are recorded on the hard disk when the moving image data and other data are recorded in different areas has been described. The present invention is not limited to this, and is widely applied to a case where various types of data are recorded, such as a case where moving image data with a high image quality with a low data compression ratio and a moving image data with a long time mode with a high data compression ratio are recorded. Thus, effects similar to those of the above-described embodiment can be obtained. In this case, moving image data of high image quality on the high transfer speed side is continuously recorded by assigning and recording moving image data of high image quality and moving image data of the long mode to the outer peripheral area and the inner peripheral area, respectively. Recording and playback.

In the above embodiment, the FAT
Although the case where the data area of the hard disk 3 is managed by the file system has been described, the present invention is not limited to this, and can be widely applied to the case where the data area is managed by various management file systems.

In the above-described embodiment, the case where the present invention is applied to a removable hard disk device has been described. However, the present invention is not limited to this, and may be applied to a phase change optical disk device, an optical disk device using thermomagnetic recording, and the like. It can be widely applied to various disk devices such as disk devices.

[0058]

As described above, according to the present invention, for input data such as moving image data at a high transfer rate,
For recording on the outer peripheral area of the disk-shaped recording medium and input data such as still image data at a low transfer rate,
By recording in the inner peripheral area of the disc-shaped recording medium, even when a plurality of types of input data are mixed and recorded on the disc-shaped recording medium, the input data with a high transfer rate can be continuously recorded and reproduced. .

[Brief description of the drawings]

FIG. 1 is a flowchart showing a processing procedure of a hard disk control circuit of a hard disk device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an overall configuration of a hard disk device.

FIG. 3 is a plan view for describing zoning of the hard disk in FIG. 2;

FIG. 4 is a chart for explaining a recording area of a hard disk in FIG. 2;

FIG. 5 is a table showing file management data recorded in a directory area of FIG. 4;

FIG. 6 is a table showing codes recorded in a FAT area of FIG. 4;

FIG. 7 is a table provided for describing an operation at the time of recording in the hard disk device of FIG. 1;

FIG. 8 is a table for explaining an operation at the time of recording in a hard disk device according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hard disk device, 2 ... AV equipment, 3 ... Hard disk, 5 ... Buffer memory, 6 ... Hard disk control circuit

Claims (3)

[Claims] 1. A disk device for recording a plurality of types of input data on a disk-shaped recording medium so as to be accessible in file units, wherein said input data having a high transfer speed is recorded on an outer peripheral area of said disk-shaped recording medium. A disk device, wherein the input data of the transfer speed is recorded in an inner peripheral area of the disk-shaped recording medium. 2. The disk device according to claim 1, wherein a recording area of the disk-shaped recording medium is divided into the inner peripheral area and the outer peripheral area for management. 3. The method according to claim 1, wherein the input data of the high transfer speed is sequentially recorded from an outer peripheral side of the disk-shaped recording medium, and the input data of the low transfer speed is sequentially recorded from an inner peripheral side of the disk-shaped recording medium. 2. The disk device according to claim 1, wherein: