JP2007328912A - Disk apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To speed up data-processing by efficiently operating a head actuator in accordance with the executing mode of a read/write command. <P>SOLUTION: A plurality of actuators 24 and 25 (head 24a and 25a) is arranged on regions 15a and 15b, respectively, of a disk medium 15. The actuator control unit individually controls the operation of the actuator in each of the regions. If the head has stopped at a middle of the specified range due to a seek operation, the latter half part from the stopped point is read ahead before the head rotates up to the top position. When the predetermined skip command following the current command is carried out, a second head different from the head executing the current command is used. When a data-write range covers a plurality of tracks, both heads carry out processing in parallel to each other. When a write-operation is once discontinued and then carried out again, one of both the heads that has a shorter rotation waiting time set to the data write part in the discontinuation mode is used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disk device, and more particularly to a disk device that executes a read / write command based on the operation of a head and its actuator.

  In this specification, the term “read / write” means “read or write (including read and write)”, and the term “command” means “some instruction for various processes / operations”. Used in.

  Disk devices are widely used as data storage means. In recent years, the disk mechanism has become more refined and power-saving, and a plurality of actuators can be mounted in the disk device.

  Under such circumstances, for example, the single or plural actuators are operated efficiently (coordinated) according to the execution mode of the read / write command sent from the host, and the data processing as a whole disk device is accelerated. The present invention meets this need.

    FIG. 13 is an explanatory diagram showing conventional read / write command processing, in which the passage of time is taken in the horizontal direction.

In this command processing,
・ After the read operation of the current command (read command) ends, seek operation to the target track of the next command (write command) is started,
-Reordering processing is executed until the read / write operation of each command is completed.

  The reordering process is a specified range in which read / write commands that arrive at random from the host are accumulated in a queue, and a new access time after execution of the current command of the head (actuator) is expected to be the shortest from this command group. Is to select a command.

  FIG. 14 is an explanatory diagram showing conventional sequential write command processing, in which the passage of time is in the horizontal direction.

  This process is to continuously write the write data 1 to 4 to the disk area (sector area) in the range specified by the write command. RSP1 to RSP3 indicate status responses.

  In the case shown in the figure, the start of the bus transfer (data out) of the write data 3 from the host was delayed, so that the data 3 could not be written immediately after the data 2 on the disk device side, and a head rotation wait occurred. Is shown.

  In the case of a conventional disk device, the operation of the head (actuator) with respect to the read / write target area is uniform. For example, even when the data bus transfer is interrupted and restarted as described above, the original head is used to write data to the portion following the write area at the time of interruption.

  Due to such uniformity of the head operation mode, the processing time required for the read / write command is shortened, for example, a maximum of one track waiting for rotation is generated even when writing after the above-described data transfer is resumed. In other words, there was a problem that the cause of the failure could not be dealt with.

  Accordingly, an object of the present invention is to speed up data processing as a whole disk device by efficiently (cooperating) operating a single or a plurality of head actuators according to the execution mode of a read / write command. To do.

The present invention solves this problem as follows.
(1) In a disk device that executes a read / write command randomly sent from a host based on operations of a plurality of heads and actuators corresponding to the plurality of heads,
Actuator control means for controlling the plurality of actuators to individually operate the head in different areas of the disk medium;
The second actuator driven by the second actuator for a plurality of processing-waiting commands with reference to the end point of the access operation by the first head driven by the first actuator to the specified range of the command currently being executed. Reordering means for sequentially obtaining a new access time by the head of 2 for each processing-waiting command, and selecting a processing-waiting command having the shortest access time as the next command of the second head;
Command execution means for instructing the actuator control means to perform a seek operation of the second actuator based on the selected next command;
Is provided.
(2) In a disk device that executes a read / write command randomly sent from a host based on the operation of a plurality of heads and actuators corresponding to each of the plurality of heads,
Actuator control means for controlling the plurality of actuators to individually operate the head in different areas of the disk medium;
For a second command that follows the first command that is currently being executed, the access time to the specified range of the second command by the first head and the first actuator that are executing the first command; When the access time to the specified range by the second head and the second actuator is compared, and it is determined that the access time by the second head is shorter, the second head and the second actuator Reordering means for selecting a second command;
Command execution means for instructing the actuator control means to perform a seek operation of the second actuator based on the selected second command;
Is provided.
(3) In (2) above,
The reordering means includes:
Based on the read start time of the first head to the designated area by the first command, the read time by the first head and the second command from the first head position at the read processing end time The time obtained by adding the corresponding access times is compared with the access time corresponding to the second command from the position of the second head at the start time.
(4) In (2) above,
The reordering means includes:
The access time corresponding to the second command from the write end position of the first head based on the end time of the write operation by the first head in response to the first command, and the second head The access time corresponding to the second command is compared from the end time.
(5) In the above (3) or (4),
The access time includes the seek time to the target track corresponding to the second command by the first actuator or the second actuator, and the first head or the second head according to the second command. It is a time obtained by adding together the rotation time of the disk medium until the corresponding target sector is reached.
(6) In a disk device that executes a read / write command sent from the host,
A disk medium;
A head for reading and writing data to the disk medium;
An actuator to which the head is attached;
Actuator control means for operating the actuator;
When the actuator control unit seeks the actuator to a target track according to the received command, it is determined whether or not the head is within a range specified by the command, and the head is positioned at an intermediate position of the specified range. If it is determined that the head is located in the designated range, the head accesses from the position where the head is located to the end of the designated range, waits for the disk medium to rotate to the beginning of the designated range, and waits for the designated range. A control unit that performs access by the head from the top;
Is provided.

  In the present invention, in relation to the read / write operation of the first head, the reordering process for the second head is completed and the seek operation of the head is started. Becomes shorter.

  Further, the access time to the designated range of the second command subsequent to the first command currently being executed is different from the case of the first head executing the first command and the time different from that head. Compared with the case of using two heads, the second command is selected for the head whose access time is determined to be short, so the processing time of the entire continuous command is shortened.

  Also, for example, if the head falls in the middle of the specified range due to a seek operation based on the read command, the second half of the specified range from the head drop point is prefetched without waiting for rotation to the head position, so the seek ends Later head operation time is shortened.

  As will be described later, when a predetermined skip command following the current command is executed, a second actuator different from the first actuator used in the current command is used. The elapsed time from the end of read / write to the start of read / write of data of the next command is shortened.

  Further, as will be described later, when the designated range of the read / write command extends over a plurality of tracks, parallel processing is performed if a plurality of heads are used, so that the processing time of the entire data to be read / written is shortened. .

  As will be described later, when the read / write operation is interrupted and resumed, the head with the smaller rotation waiting time until the data read / write portion at the time of interruption is used among the plurality of heads. Therefore, the elapsed time from the start of data read / write after the restart of operation is shortened.

  The present invention is directed to a disk device having such characteristics, and also to a computer-readable recording medium storing a program for causing the disk device to execute an operation corresponding to the characteristics as described later. Yes.

  The present invention is directed to various disk media such as a magnetic disk medium, an optical disk medium, and a magneto-optical disk medium.

  As described above, according to the present invention, the single or plural actuators are efficiently (cooperatively) operated according to the execution mode of the read / write command, so that the data processing of the entire disk device can be accelerated. Can do.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an explanatory diagram showing the overall configuration of the disk device,
1 is a disk device that receives a command including an address (logical address) for designating a read / write range of data from a host and executes read / write processing of a disk medium based on the command;
11 is a segment buffer read / write means,
12 is a segment buffer for holding write data sent from the host separately from the write command and read data of the disk medium,
13 and 14 are medium read / write means,
15 is a disk medium having concentric tracks (cylinders) as read / write target areas, and each track is divided into sectors (for example, corresponding to a data length of 512 bytes) as unit areas for read / write processing, 15a is the outer area of the disk medium, 15b is the inner area of the disk medium,
16 is a command queue holding unread read / write commands,
17 selects a command having the shortest next access time (access time from the last read / write sector at the time of execution of the current command) among the commands held in the command queue 16; A reordering processor that determines whether this is a continuous access command,
18 is the final address (final sector number) of the current command for each actuator,
19 is a command execution unit for executing various read / write processes to be described later.
In the case of a write command in which the designated range of data writing extends over the next track, 20 is used to hold the first half and the second half of the write data as separate segments. Data storage segment switching setting section,
21 is a host controller for controlling the pointer position when the write data from the host is held in the segment buffer 12 or when the request data of the host is read from the segment buffer 12,
22 is a pointer control unit corresponding to a disk for controlling the pointer position when the read data from the disk medium 15 is held in the segment buffer 12 or when the write data to the disk medium 15 is read from the segment buffer 12.
23 is an actuator control unit that operates based on an instruction from the command execution unit 19,
24 is an actuator that moves the outer region 15a in the radial direction, 24a is a head attached to the tip of this actuator,
25 is an actuator that moves the inner region 15b in the radial direction, 25a is a head attached to the tip of this actuator,
Respectively.

  The above-mentioned “command with the shortest next access time” is a command with the shortest total time obtained by adding the rotation waiting time to the head target sector to the seek time from the head position to the target track after completion of the current command execution. Select.

  The disk device 1 has an address conversion table (not shown) for associating the logical address (specified range) in the command with the track / sector number of the disk medium 15.

  The reordering processing unit 17 and the command execution unit 19 refer to this address conversion table as necessary to obtain the track / sector number corresponding to the logical address specified by the read / write command.

  The track number and sector number are used to determine the head position on the disk medium and the positional relationship between the command specification range (start position) and the head.

  Each track of the disk medium is provided with a servo sector for position detection every two to three sectors, and the current head position is specified based on the detection signal of this servo sector.

  One or more actuators 24 and 25 are provided in each of the outer area 15 a and the inner area 15 b of the disk medium 15.

  The actuator controller 23 individually controls the movement modes of these actuators, and a plurality of heads can be operated on the same track of the disk medium 15 as described later.

  FIG. 2 is an explanatory diagram showing the relationship between command processing and reordering, with the passage of time in the horizontal direction.

In phase T1,
-Actuator A is operated to execute access to the target sector which is the range specified by the current command x (seek to the target track and subsequently wait for rotation to the target sector),
The next command y is selected by executing the reordering process for the actuator B. At this time, the (seek + waiting for rotation) time (predicted value of T2) of the command is calculated. Note that read / write is not executed in the first phase.

In phase T2,
-Hold the actuator A read data in the segment buffer 12 and transfer it to the host side.
The data of the sector part following the specified range of the current command x is read by the actuator A and prefetched into the segment buffer 12,
-Actuator B is actuated to execute access to the target sector that is the start position of the range specified by the next command y (seek to the target track and subsequent wait for rotation to the target sector),
The command z is selected one after another by executing the reordering process for the actuator A.

Here, in the reordering process for the next command y,
-Actuator B's (actuator A) read command (from actuator A) head position (seek + rotation waiting time) corresponding to the command y is
-Actuator A read time + shorter than "corresponding to command y from head position at end of read (seek + rotation wait time)"
Judging.

  In the reordering process for the next command z, the head position of the actuator after prefetching is specified based on T2 (predicted value) of the next command y, and (seek) from this head position to the first sector of the next command z is determined. + Rotation waiting time).

  In the case of a write command such as the next command y, a write data transfer request is transmitted to the host at the start of seeking to the target track of the command. Then, the write data received from the host is written into the target sector.

In this way
The read / write by the first actuator that has already accessed the target sector, the reordering for the first actuator, and the access of the second actuator to the target sector are repeated in parallel.

  As a result, the processing time required for continuously executing a plurality of read / write commands is shortened.

  As shown in the figure, the unit of the reordering process is an operation time for seek and rotation waiting for a selection command.

  The end point of the phase T2 may be not the end of waiting for rotation as shown in the figure but the end of writing. This is because, in the case of a write command, since the data transfer request is normally issued to the host side at the start of the seek and the write data is received by the start of the write, the bus with the host is not occupied during the write operation. This is because a new command may be transferred from the host and reordering targets may increase.

FIG. 3 is an explanatory diagram showing the flow of the reordering process, the contents of which are as follows.
(s11) One command is taken out from the command queue 16 and the reordering process is executed. That is, the time to access the head address position of the command (taken command) after completion of the current execution command has been considered for reordering. The process proceeds to the next step after determining whether or not the command is shorter than that of the command, and also proceeds to step (s14) in response to a read / write operation start interrupt.
(s12) It is determined whether or not an unprocessed command (reordering unreviewed command) remains in the command queue 16. If “YES”, the process returns to step (s11), and if “NO”, the next Proceed to step. Further, the process proceeds to step (s14) triggered by the read / write operation start interrupt.
(s13) Transition to the waiting state, return to step (s11) with a new command reception interrupt as a trigger, and proceed to step (s14) with a read / write operation start interrupt as a trigger.
(s14) Start the execution task of the reordered command and return to step (s11).
As described above, a write operation end interrupt may be used instead of the write operation start interrupt.

  FIG. 4 is an explanatory diagram showing the state of random read command processing. As a result of the head seek operation based on the read command for the sector areas (a to c) of the target track, b in the middle of a and c is shown. A state where the head has fallen is shown at a point.

here,
First, after the seek operation, without waiting for rotation to the first point a in the read sector area, the data (b to c) to be read after the point b where the head has dropped is immediately read and the segment i is read. Hold in the storage area << 1 >>, that is, the part following the storage area << 3 >> of the data (ab),
Next, the data (c to d) corresponding to the so-called surplus area (storage area << 2 >>) of the segment i is read out from the data after the point c and prefetched into this storage area << 2 >>
Next, the rotation waiting to the point a is performed, the data (ab) are read out, and held in the storage area << 3 >> of the segment i.

  As a result, it is possible to shorten the storage time of the entire request data in the segment i and the transfer time to the host after the seek operation.

FIG. 5 is an explanatory diagram showing a random read command processing flow corresponding to FIG. 4, and the contents thereof are as follows.
(s21) Issue a seek command to the target track of the random read command and proceed to the next step.
(s22) The head position information (sector number) of this actuator is collected, and the process proceeds to the next step.
(s23) Determine whether this head position is in the middle of the command request data (in the middle of the target sector that is the command specified range). If "YES", proceed to the next step. If "NO" Advances to step (s27).
(s24) Move the read pointer to the segment and proceed to the next step. The execution subject is the pointer control unit 22 corresponding to the disk, and moves the read pointer to the corresponding segment in such a manner that the head is dropped from the request start address that is the command specification range. For example, if the command read request range is from sector 3 to sector 10 of the target track and the head is located in the area of sector 5 and can read from the next sector 6 when seeking to the target track, read is performed. The reading pointer is moved to the position where the data amount of sectors 3 to 5 is skipped from the head of the corresponding segment of data, that is, the holding portion of the head data of sector 6.
(s25) Read the data from the latter half of the request data, for example, the sector next to the seek end position of the head to the last sector of the command read request range, and proceed to the next step. The read data is held sequentially from the position of the read pointer of the corresponding segment. The sector number of “next sector” at this time is held in a work area (not shown) or the like.
(s26) The data following the last sector in the read request range is prefetched, and the process proceeds to the next step. The prefetch range is a range that can be held in the remaining portion on the rear side of the corresponding segment after holding the latter half of the request data. This is specified based on the segment size and the read request data size.
(s27) Wait for rotation until the target sector reaches the head position, and proceed to the next step. Here, when the read pointer is not located at the head of the corresponding segment, that is, when the latter half of the request data is already held after the skip position of the corresponding segment, the read pointer is moved to the corresponding position.
(s28) The requested data is read from the first target sector on the disk.
When the second half of the request data has been read in step (s25), that is, when the sector number of the “next sector” is held, the read to the sector immediately before the sector number is executed. To do. The read data is held sequentially from the position of the read pointer of the corresponding segment.

FIG. 6 is an explanatory diagram showing the state of the skip read command processing.
The disk medium 15 rotates counterclockwise,
The actuator A finishes executing the sequential read command (Seq command 1) for reading the sector data at the logical addresses (a to b)
A sequential read command (Seq command 2) for reading sector data at logical addresses (c to d) will be executed from the actuator B from now on.
Indicates the state.

  The corresponding sectors of the logical addresses (ab) and (c-d) are on the same track, and the size relationship of the logical addresses is a <b <c <d.

Execution conditions for skip read command processing are:
“D (skip read determination interval)> c−b, c ≧ b + 2”
It is.

While satisfying this execution condition,
“H (head spacing) <c−b”
If is not established, skip read command processing is executed with the same head. The values of D and H are preset.

If each sector of the logical addresses b and c is not on the same track, instead of the above-mentioned “H (head interval) <c−b”,
“H (head interval) <c−b + (number of sectors corresponding to skew time)”
Is used.

  In the illustrated case, the command execution unit 19 determines that the Seq command 2 next to the Seq command 1 is skip read, and when the head data portion (c) of this read command has not yet passed through the head of the actuator B, The head is controlled to read the data in the (c to d) area. This “passing” determination process is also performed by comparing the head position address with that of the head data portion (c).

  Further, the read data of the Seq command 1 (a to b) and that of the Seq command 2 (c to d) are held in separate segments, and the read data of (a to b) is executed when the Seq command 2 is executed. To the host side.

  Thereby, even in the case of a skip read command, the processing time can be increased.

FIG. 7 is an explanatory diagram showing a sequential read command processing flow corresponding to FIG. 6 and the contents thereof are as follows.
(s31) Determine whether the current command (the next processing target) is a skip read command,
If “YES”, the process proceeds to the next step, and if “NO”, the process proceeds to step (s37). The determination criterion at this time is whether or not both “D (skip read determination interval)> c−b, c ≧ b + 2” are satisfied.
(s32) The position information of the other head (the head of the actuator B), that is, the sector number of the portion where the head is located is obtained, and the process proceeds to the next step.
(s33) It is determined whether or not the skip read interval (the interval from the read sector to the first sector of the skip read) is equal to or greater than the head interval to be switched. If “YES”, the process proceeds to the next step and “NO” In the case of, go to step (s36). The determination criterion at this time is whether or not “H (head interval) <c−b” is satisfied.
(s34) It is determined whether the other head is ahead of the first sector (point c) of the skip read. If “YES”, the process proceeds to the next step, and if “NO”, the process proceeds to step (s36). move on.
(s35) The reading head is switched to the other head, and the process proceeds to the next step.
(s36) Waits for the rotation of the read head to the next read sector, and proceeds to the next step.
(s37) The read data is read from the head of the read sector by the read head.

  In the case of FIG. 6, the read head for the skip sequential read command is the head of the actuator B.

  FIG. 8 is an explanatory diagram showing a state of write command processing with a large amount of data. The illustrated random write command has a content for writing data (ac) exceeding the size of a single segment. At the time of execution, the write track is shifted by the portion b in the write data.

  In order to efficiently perform a data write operation with a track shift, the sector arrangement on the disk medium is set to a skew mode in which the write start position for the next inner track is shifted as shown in the figure.

  In this way, when the data length specified by the write command is larger than the segment size and the next write track is moved in the middle of the write data, the write data storage segment switching setting unit 20 causes the write data (a ... Are switched between the segment i storing .about.b) and the segment j storing the latter half write data (b.about.c).

  Thereafter, the data of the segments i and j are written in parallel on separate tracks by the heads of the actuators A and B, respectively.

  Thereby, even in the case of a write command in which the designated range extends over a plurality of tracks on the disk medium, the processing time can be shortened.

  FIG. 9 is an explanatory diagram showing the state of write command processing at the time of interruption / resumption of data-out, where (a) shows the time of interruption of data-out, and (b) shows the time of resumption of data-out.

  The interruption of data-out occurs when the start of transfer of write data for the next write command is delayed in the sequential write command processing.

  Here, an actuator B different from the actuator A that is executing the sequential write process is arranged behind the track where the head of this A is on (a position where the same data can be accessed with a certain time delay), and the data When the OUT is resumed, the head (actuator) having the shorter rotation waiting time until the beginning of the data writing is selected.

  That is, as shown in (a), when the data out from the host is interrupted when the storage data (ab) of segment i is written to the disk medium 15 by the head of the actuator A, the head of the actuator B Find the position (sector number). Since the point b corresponds to the address specified by the write command, the position information is known.

  If the point b does not reach the head of the actuator B, the main body of the write operation is switched from the actuator A to the actuator B and waits for the data out to resume.

  Thereafter, as shown in (b), if data out is resumed before the point b reaches the head of the actuator B, the write operation is resumed using the actuator.

  If the data out is not resumed until the point b reaches the head of the actuator B, the main body of the write operation is returned to the actuator A again to wait for the data out to resume. Thereafter, the same processing is repeated depending on whether or not the data-out is resumed until the point b reaches the main body of the write operation.

  This shortens the idling time until the actual data write starts after the data-out is resumed.

FIG. 10 is an explanatory diagram showing a write command processing flow corresponding to FIG. 8, and the contents thereof are as follows.
(s41) It is determined whether the write request range (address range specified by the write command) extends over the track of the disk medium 15. If “YES”, the process proceeds to the next step and step (s45), and “NO”. In case of, proceed to the next step. For this determination, a correspondence table of addresses and sector numbers is used as described above.
(s42) The seek operation to the first track in the write request range is started, and the process proceeds to the next step (see actuator A in FIG. 8).
(s43) After the end of this seek operation, the state shifts to the rotation waiting state at the head position (point a in FIG. 8) of the write request range and proceeds to the next step.
(s44) The write operation of the request data from the head position to the subsequent part is started.
(s45) The seek operation to the next track in the write request range is started, and the process proceeds to the next step (see actuator B in FIG. 8).
(s46) After the end of this seek operation, the next track start position (point b in FIG. 8) that is continuous with the write range of the first track shifts to a rotation waiting state and proceeds to the next step.
(s47) The write operation of the request data (next track corresponding disk) from the head position of the next track to the subsequent part is started.

FIG. 11 is an explanatory diagram showing a write command processing flow corresponding to FIG. 9, and the contents are as follows.
(s51) The seek operation to the write request range (address range specified by the write command) is started, and the process proceeds to the next step (see actuator A in FIG. 9).
(s52) After the end of this seek operation, the state shifts to the rotation waiting state at the head position (point a in FIG. 9) of the write request range and proceeds to the next step.
(s53) The write operation of the requested data from the head position to the subsequent part is started, and when the data transfer from the host is interrupted, the process proceeds to the next step.
(s54) After writing the remaining write data in the segment, the process proceeds to the next step.
(s55) When the state shifts to the rotation waiting state and the data transfer from the host is resumed, the process proceeds to the next step.
(s56) The head of the same track (actuator B in FIG. 9) in the same track as the head (actuator A in FIG. 9) performing the write operation in step (s53) is the head position (see FIG. It is determined whether or not the rotation waiting time up to point b of 9) is short. If “YES”, the process proceeds to the next step, and if “NO”, the process proceeds to step (s58).
(s57) The write head is changed to another head, and the process proceeds to the next step.
(s58) The process shifts to the rotation waiting state at the head position and proceeds to the next step.
(s59) The request data write operation is resumed from the head position to the subsequent part.

  The above description in the embodiment of the invention can be applied to both a read command and a write command.

  The actuator that executes the read command and the actuator that executes the write command may be separated.

  As a result, even when a write command is issued after a read command, the read command execution actuator will not interrupt the read operation by the write command after reading the requested data in the specified range. Prefetch can be performed until it is filled with read data.

  FIG. 12 is an explanatory diagram showing an outline of a computer system that reads and executes a program from a computer-readable recording medium. 3 is a computer system, 31 is a main body incorporating a CPU, a disk drive device, and the like, and 32 is a main body. A display for displaying an image according to an instruction from the unit 31, 33 a display screen, 34 a keyboard for inputting various information to the computer system 3, 35 a mouse for designating an arbitrary position on the display screen 33, and 36 A disk device 37 having a memory or the like indicates a portable recording medium such as a CD-ROM or a flexible disk.

The recording medium for storing the program is
-Disk device 36
-Portable recording medium 37
A RAM or a hard disk of the main body 31. The program is executed by the disk device 36. When the program is stored in the portable recording medium 37, the RAM of the main body 31, the hard disk, or the like, the program is transferred to the disk device 36 via the main body 31.

(Supplementary note 1) In a disk device that executes a read / write command randomly sent from a host based on the operation of a plurality of heads and actuators corresponding to each of the plurality of heads,
Actuator control means for controlling the plurality of actuators to individually operate the head in different areas of the disk medium;
The second actuator driven by the second actuator for a plurality of processing-waiting commands with reference to the end point of the access operation by the first head driven by the first actuator to the specified range of the command currently being executed. Reordering means for sequentially obtaining a new access time by the head of 2 for each processing-waiting command, and selecting a processing-waiting command having the shortest access time as the next command of the second head;
And a command execution means for instructing the actuator control means to perform a seek operation of the second actuator based on the selected next command.
(Supplementary Note 2) In a disk device that executes a read / write command randomly sent from a host based on the operation of a plurality of heads and actuators corresponding to each of the plurality of heads,
Actuator control means for controlling the plurality of actuators to individually operate the head in different areas of the disk medium;
For a second command that follows the first command that is currently being executed, the access time to the specified range of the second command by the first head and the first actuator that are executing the first command; When the access time to the specified range by the second head and the second actuator is compared, and it is determined that the access time by the second head is shorter, the second head and the second actuator Reordering means for selecting a second command;
And a command execution means for instructing the actuator control means to perform a seek operation of the second actuator based on the selected second command.
(Supplementary note 3) In the disk device according to supplementary note 2,
The reordering means uses a read time of the first head to a designated area by the first command as a reference and reads from the first head position at the read time of the first head and the read processing end time. Comparing the sum of the access time corresponding to the second command and the access time corresponding to the second command from the position of the second head at the start time;
A disk device characterized by the above.
(Appendix 4) In the disc device according to Appendix 2,
The reordering means has an access time corresponding to the second command from the write end position of the first head with reference to the end time of the write operation by the first head for the first command; A disk device characterized in that the access time corresponding to the second command is compared from the end point by the second head.
(Supplementary note 5) In the disk device according to supplementary note 3 or 4,
The access time includes the seek time to the target track corresponding to the second command by the first actuator or the second actuator, and the first head or the second head according to the second command. It is the time of adding the rotation time of the disk medium to reach the corresponding target sector,
A disk device characterized by the above.
(Supplementary Note 6) In a disk device that executes a read / write command sent from a host,
A disk medium;
A head for reading and writing data to the disk medium;
An actuator to which the head is attached;
Actuator control means for operating the actuator;
When the actuator control unit seeks the actuator to a target track according to the received command, it is determined whether or not the head is within a range specified by the command, and the head is positioned at an intermediate position of the specified range. If it is determined that the head is located in the designated range, the head accesses from the position where the head is located to the end of the designated range, waits for the disk medium to rotate to the beginning of the designated range, and waits for the designated range. A control unit that performs access by the head from the top,
A disk device characterized by the above.
(Additional remark 7) The recording medium which memorize | stored the program used with a disk apparatus which performs the read / write command sent at random from a host based on the operation | movement of a some head and the actuator corresponding to each of the said some head In
The program is
The second actuator driven by the second actuator for a plurality of processing-waiting commands with reference to the end point of the access operation by the first head driven by the first actuator to the specified range of the command currently being executed. In order for the computer to realize a function of sequentially obtaining a new access time by the second head for each processing-waiting command and selecting the processing-waiting command having the shortest access time as the next command of the second head belongs to,
A computer-readable recording medium.
(Supplementary note 8) A recording medium storing a program used in a disk device, which executes a read / write command randomly sent from a host based on operations of a plurality of heads and actuators corresponding to each of the plurality of heads In
The program is
For a second command that follows the first command that is currently being executed, the access time to the specified range of the second command by the first head and the first actuator that are executing the first command; When the access time to the specified range by the second head and the second actuator is compared, and it is determined that the access time by the second head is shorter, the second head and the second actuator A function for causing a computer to select a second command;
A computer-readable recording medium.
(Additional remark 9) In the recording medium which memorize | stored the program used with the disk apparatus which performs the read / write command sent from a host,
The program is
When the actuator is sought to the target track by the actuator control means according to the received command, it is determined whether or not the head is within the range specified by the command, and the head is positioned at an intermediate position of the specified range. If determined, the head accesses from the position where the head is located to the end of the designated range, waits for the disk medium to rotate to the beginning of the designated range, and then from the beginning of the designated range. The function of performing access by the head is to realize a computer.
A computer-readable recording medium.

It is explanatory drawing which shows the whole structure of the disc apparatus of this invention. It is explanatory drawing which shows the relationship between command processing and reordering of this invention. It is explanatory drawing which shows the reordering process flow of this invention. It is explanatory drawing which shows the mode of the random read command process of this invention. It is explanatory drawing which shows the random read command processing flow corresponding to FIG. 4 of this invention. It is explanatory drawing which shows the mode of a skip read command process of this invention. It is explanatory drawing which shows the sequential read command processing flow corresponding to FIG. 6 of this invention. It is explanatory drawing which shows the mode of the write command process with much data amount of this invention. It is explanatory drawing which shows the mode of the write command process at the time of interruption / resumption of data out of this invention, (a) shows the time of interruption of data out, (b) has shown the time of resumption of data out. It is explanatory drawing which shows the write command processing flow corresponding to FIG. 8 of this invention. It is explanatory drawing which shows the write command processing flow corresponding to FIG. 9 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an outline of a computer system that reads and executes a program from a computer-readable recording medium according to the present invention. It is explanatory drawing which shows the mode of the conventional read / write command process. It is explanatory drawing which shows the mode of the conventional sequential write command process.

Explanation of symbols

1: disk device 11: segment buffer read / write means 12: segment buffer 13, 14: medium read / write means 15: disk medium 15a: disk medium outer area 15b: disk medium inner area 16: command queue 17: reordering process Unit 18: Final address 19 for each actuator 19: Command execution unit 20: Write data storage segment switching setting unit 21: Host compatible pointer control unit 22: Disk compatible pointer control unit 23: Actuator control unit 24: Diameter of the outer area 15a Actuator 24a moving in the direction: Head 25: Actuator 25a moving in the radial direction in the inner region 15b: Head 3: Computer system 31: Main unit 32 incorporating CPU, disk drive device, etc. Display 33: Display Surface 34: Keyboard 35: Mouse 36: disk device 37: a portable recording medium such as a CD-ROM or a flexible disk

Claims (6)

In a disk device that executes a read / write command randomly sent from a host based on the operation of a plurality of heads and an actuator corresponding to each of the plurality of heads,
Actuator control means for controlling the plurality of actuators to individually operate the head in different areas of the disk medium;
The second actuator driven by the second actuator for a plurality of processing-waiting commands with reference to the end point of the access operation by the first head driven by the first actuator to the specified range of the command currently being executed. Reordering means for sequentially obtaining a new access time by the head of 2 for each processing-waiting command, and selecting a processing-waiting command having the shortest access time as the next command of the second head;
And a command execution means for instructing the actuator control means to perform a seek operation of the second actuator based on the selected next command. In a disk device that executes a read / write command randomly sent from a host based on the operation of a plurality of heads and an actuator corresponding to each of the plurality of heads,
Actuator control means for controlling the plurality of actuators to individually operate the head in different areas of the disk medium;
For a second command that follows the first command that is currently being executed, the access time to the specified range of the second command by the first head and the first actuator that are executing the first command; When the access time to the specified range by the second head and the second actuator is compared, and it is determined that the access time by the second head is shorter, the second head and the second actuator Reordering means for selecting a second command;
And a command execution means for instructing the actuator control means to perform a seek operation of the second actuator based on the selected second command. The disk device according to claim 2,
The reordering means uses a read time of the first head to a designated area by the first command as a reference and reads from the first head position at the read time of the first head and the read processing end time. Comparing the sum of the access time corresponding to the second command and the access time corresponding to the second command from the position of the second head at the start time;
A disk device characterized by the above. The disk device according to claim 2,
The reordering means has an access time corresponding to the second command from the write end position of the first head with reference to the end time of the write operation by the first head for the first command; The disk device characterized in that the access time corresponding to the second command is compared from the end point by the second head. The disk device according to claim 3 or 4,
The access time includes the seek time to the target track corresponding to the second command by the first actuator or the second actuator, and the first head or the second head according to the second command. It is the time of adding the rotation time of the disk medium to reach the corresponding target sector,
A disk device characterized by the above. In a disk device that executes a read / write command sent from the host,
A disk medium;
A head for reading and writing data to the disk medium;
An actuator to which the head is attached;
Actuator control means for operating the actuator;
When the actuator control unit seeks the actuator to a target track according to the received command, it is determined whether or not the head is within a range specified by the command, and the head is positioned at an intermediate position of the specified range. If it is determined that the head is located in the designated range, the head accesses from the position where the head is located to the end of the designated range, waits for the disk medium to rotate to the beginning of the designated range, and waits for the designated range. A control unit that performs access by the head from the top,
A disk device characterized by the above.

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