JPH0283828A - Disk driving device - Google Patents

Abstract

PURPOSE:To automatically control the movement of an optical head, and to attain the high speed and high efficiency of a processing in a continuously writing action, etc., over a track by providing a writing action detecting means, a track number detecting means, a storing means, etc. CONSTITUTION:When an instruction to enter an erasing or writing action is issued from a host disk controller, an erasing/writing action detecting part 15 is detected, a driver control part 12 reads an ID number (track number) at this time from an ID number detecting part 11 and stores it into an ID number storing part 14. When the erasing/writing action detecting part 15 detects the completion of the action, it is transferred to the driver control part 12, the control part 12 reads the then ID number from the detecting part 11, compares with the ID number of the storing part 14, and when both are the same, an optical head 3 is returned and orientated to the position and when both are different, a head 3 is returned and orientated up to the track at the time of starting. Even when the moving instruction of an optical head is not issued from a disk controller to a disk driving device, since the disk driving device itself detects the action completion and moves the optical head, the high speed of the processing is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disk drive device, and more specifically, to a disk drive device that moves an optical head to a specific track on a storage medium such as a magneto-optical disk based on instructions from a host controller. The present invention relates to a disk drive device in which an optical head is positioned on the track to facilitate data writing/reading by a disk controller.

(Prior Art) As is well known, an optical disk is a storage medium in which data is written/read using a laser beam, and is characterized by non-contact and high-density recording. There are so-called magneto-optical disks that are rewritable.

Generally, in this type of magneto-optical disk, a track 21 is formed spirally from the center of the recording surface toward the outer periphery, as shown in FIG. 3, and data is continuously recorded on the track 21. Further, the track 21 is assigned a track number in order for each revolution, and is divided into a plurality of (for example, 16) sectors S1 to SXC in the circumferential direction. Then, one sector has <I> as shown in Fig. 4.
A D section 31 and a data section 32 which is actual storage information are provided.

To explain the configuration of this sector in detail, first, in the ID section 31,
A track number 36 and a sector number 37 uniquely assigned to that sector are written. Also.

The sector mark 33 is a special pattern that indicates the beginning of the sector, the VFO pattern 34 is a synchronization pattern, the address mark 35 is an identification mark provided just before the track number 36 and sector number 37, and the CRC 38 is an error check code. This is used to check that the read track number 36 and sector number 37 are correct.

Further, the gap 39 is provided to provide a distance between the ID section 31 and the data section 32.

Furthermore, in the data section 32, Vi? O pattern 4
0 is a pattern for synchronizing when reading the data 42, and a data sink 41 is placed immediately before the data 42 for identification. Furthermore, ECC43 uses data 42
This is an error correction coat, and data errors of several bits are corrected and the data becomes correct.

On the other hand, the optical head that writes and reads data on the disk is arranged opposite to the storage surface of the disk and is movable in the radial direction, allowing random access to predetermined tracks on the disk. . That is, by moving the optical head in the radial direction and rotating the disk, the optical head can be moved to any position on the secondary surface relative to the storage surface of the disk.

Furthermore, movement of the optical head is performed by a disk drive device connected to the optical head, and this disk drive device is connected to a host computer via a disk controller. As shown in FIG. 5, usually a plurality of disk controllers 52 are connected to one host computer 53, and a plurality of disk drive apparatuses 51 are respectively connected therebelow.

In addition, in order to actually read and write data to a plurality of consecutive sectors of a disk, the disk controller 52 first receives a request to that effect from the host computer 53 and reads and writes data from and to the specified disk drive device 51. A command is given to move the optical head to the track 21 where the first sector to be operated exists. As a result, after moving the optical head, the disk controller 52
By reading the sector number 37 of 1, the first sector of consecutive sectors is detected, and reading and writing operations are continuously performed for each sector from there.

Here, as mentioned above, the track 21 has a spiral shape, and if the optical head is controlled to follow the track as it is, the optical head will flow toward the outer circumference in the same way as a record needle, although the direction is opposite. It turns out. Therefore, conventionally, a kick pack process is performed in which the optical head is returned to the inner track by one track in the last sector of the track, and the optical head is controlled so that the optical head remains on the same track. In addition, since this kick pack processing requires the optical head to move for about one sector rotation, when the disk controller 52 performs a read/write operation on the last sector of track 2I, the disk drive device 51
detects this and causes the optical head to follow the next 1-rack 21 (one position in the outer circumferential direction) without performing kick-pack processing.

Furthermore, when writing data to a disk, the disk controller 52 performs the following operations before and after writing depending on the type of disk. first,
For additional recording type optical discs, there is a check operation to confirm that no data has been written before the write operation, and a read operation to confirm whether the data was written correctly after the write operation. Verify operations are performed respectively. On the other hand, in the case of a rewritable magneto-optical disk, an erase operation for erasing data is performed before a write operation, and a read verify operation is performed after the write operation.

(Problem to be Solved by the Invention) However, in the conventional disk drive device described above, when the disk controller performs a write operation up to the last sector in a track or a write operation for continuous sectors spanning between tracks, the disk controller A command to return the optical head to the first track must be generated every time an erase or write operation is performed. For this reason, disk drive devices only move the optical head to a predetermined position after receiving this command.
There was a problem that there was a loss in operating time and the operating efficiency was poor.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a disk drive device that can operate at high speed and with high efficiency without wasting time during complimentary operations. It is in.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a write operation detecting means for detecting the start and end of a write operation instructed by a disk controller, and a track track followed by an optical head. track number detection means for detecting a track number; and trunk number storage means for storing the track number; the starting track number at the start of the write operation is stored in the track number storage means; The end track number detected by the track number detection means is compared with the start track number, and if the two track numbers are different, the optical head is moved to the track corresponding to the start track number.

(Function) According to the present invention, when the disk controller causes the disk drive device to perform a write operation up to the last sector in a track or a continuous write operation of multiple sectors across tracks, the disk controller Even without sending a command to the device to return the optical head to the starting track, the disk drive device itself detects the start and end of each operation, determines whether or not to move the optical head, and automatically moves the optical head. control.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing this embodiment.

In the figure, a rewritable magneto-optical disk 1 as a storage medium is connected to a spindle motor 2 at its center, and is driven to rotate in a predetermined direction. Further, the spindle motor 2 is connected to a motor driver 9,
The magneto-optical disk 1 is controlled to rotate at a constant speed.

Further, above the magneto-optical disk 1, an external magnetic field generating device 4 is arranged to face the magneto-optical disk 1. This external magnetic field generator 4 is
It is used to apply a necessary magnetic field to the magneto-optical disk 1 when performing erasing and writing operations on a predetermined location on the magneto-optical disk 1, and is driven by an external magnetic field driver 5. Furthermore, a drive signal to the external magnetic field driver 5 is inputted via the driver control section 12 from a higher-level disk controller (not shown).

On the other hand, an optical head 3 is disposed below the magneto-optical disk 1 so as to face the external magnetic field generator 4 .

This optical head 3 is connected to an optical head driver 6 and is movable in the radial direction of the magneto-optical disk 1. and,
Its movement is controlled by a signal sent from an optical head driver control section 10 connected to the optical head driver 6, and control is normally performed so that the optical head 3 follows the track on the magneto-optical disk 1. .

Further, a laser driver 7 is connected to the optical head 3, and power for driving the laser necessary for data writing, reading, and erasing operations on the magneto-optical disk 1 is supplied to the optical head 3. . Note that this laser driver 7 is controlled by a signal from a higher-level disk controller that is input via the driver control section 12.

Furthermore, a binarization circuit 8 is connected to the optical head 3.
Synchronizing with the data on the magneto-optical disk 1 read by the optical head 3,
It is designed to convert into digitized data. Then, these binary data are processed by I as a track number detection means.
The data is inputted to the driver control section 12 via the D number detection section 11. Here, the ID number detection section 11 detects the track number and sector number of the sector currently being followed by the optical head 3 based on the binarized data.

The binarized data input to the ID number detection section 11 is as follows.

This is sent to a disk controller (not shown) via the driver control unit 12 and upper controller interface 13, and the disk controller also reads the sector ID section (see FIG. 4) and records the current sector number recorded there. etc., and perform read/write operations on the data section (same). Further, the driver control unit 12
Upon receiving an optical head movement request sent from the disk controller via the host controller interface 13, a movement command is sent to the head driver control unit 10, and after the optical head 3 has been moved, it orients the optical head 3 on the track. It is designed to let you do so. For this reason, the driver control unit 12 constantly monitors the ID number detection unit 11.
When it is detected that it is on the last sector, it instructs the head driver control section 10 to perform a kick pack operation.

Further, in this embodiment, the driver control unit 12 is connected to the driver control unit 12 via the ID number storage unit 14 in parallel to the path for transmitting the signal from the ID number detection unit 11 to the driver control unit 12 described above.
The optical head 3 is provided with an erase/write operation detection section I5 for detecting the start and end of data erase and write operations by the optical head 3. Here, erase/
The write operation detection unit 15 monitors the state of erase and write signals from the disk controller via the host controller interface 13, and notifies the driver control unit 12 of the start and end of the erase or write operation. When notified of the detection, the driver control unit 12 reads the ID number indicating the current track number (starting track number) from the ID number detection unit II, and sets the erase/write operation detection unit 15 to =12. The ID number is stored in the ID number storage section 14.

After the erase/write operation detection section 15 detects the end of the erase or write operation, the driver control section 12
The ID number detection unit 11 detects the ID number indicating the current track number (end track number) in which the optical head 3 exists.
The optical head driver control unit 10 reads out the optical head 3 and compares it with the one at the start of operation, and if the two are different, the optical head driver controller 10 moves the optical head 3 to the track position corresponding to the starting track number.
It is designed to send a signal to

Next, the operation of the above embodiment will be explained. For example, a command to write predetermined data on a certain address of the magneto-optical disk 1 is sent from the disk controller to the driver control unit 1.
2, the optical head driver control unit 10 and the optical head driver 6 are driven based on the signal, and the optical head 3 is moved outward from the center of the magneto-optical disk 1, which is rotating at a constant speed. let As a result, the optical head 3 moves relatively along the spiral track formed on the surface of the magneto-optical disk 1, and as it moves, the ID number (track number) stored in each sector of the track is , sector number) in sequence, and select the predetermined ID.
When the optical head 3 moves onto a sector of a track having a number, necessary data is written in the data section of that sector.

In this embodiment, when an erase or write operation start command is sent from the disk controller, the erase/write operation detection unit 15 detects this as described above. Then, the driver control unit 12 reads the ID number (track number) at this time from the ID number detection unit 11 and stores it in the ID number storage unit 14 (step 51 in FIG. 2) 6 Then, the erasing or writing operation ends. (S2), and if it has been completed, proceed to the next step.

When the erase/write operation detection unit 15 detects the end of the above operation, this is transmitted to the driver control unit 12, and the driver control unit 12 reads the ID number (track number) at that time from the ID number detection unit 11 and (S3), and is compared with the ID number previously stored in the ID number storage unit 14 (ID number at the start of operation) (S4).

If both are the same, the optical head 3 is oriented at that position and waits for the next operation command.

On the other hand, if the two are different, the optical head 3 is moved to the track corresponding to the ID number at the start of operation and localized (S5).

By doing this, the disk controller
When making the disk drive device perform a write operation up to the last sector in a track or a continuous write operation of multiple sectors across a trunk, it is possible to do so without sending a request to move the optical head 3 from the disk controller to the disk drive device. Since the disk drive device itself detects the end of the erasing or writing operation and moves the optical head 3, no wasted time occurs.

Although the above embodiment describes a disk drive device for a rewritable magneto-optical disk, the present invention is not limited to this, but can also be applied to an additional recording type optical disk drive device.

(Effects of the Invention) As described above, according to the present invention, since the write operation detection means, track number detection means, storage means, etc. are provided, when performing a continuous write operation of a plurality of sectors spanning tracks of a disk, etc. It is possible to detect the end of an erasing or writing operation within the disk drive device and immediately move the optical head to the starting track without depending on a command from the disk controller, resulting in faster and more efficient processing. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a flow chart for explaining its operation, FIG. 3 is an explanatory diagram of an optical disk, FIG. 4 is an explanatory diagram of sectors, and FIG. 5 is an explanatory diagram of an optical disc. 1 is a configuration diagram of the entire system including a disk drive device. 1...Magneto-optical disk 3...Optical head 6...Optical head driver 10...Optical head driver control section 6-ET14...ID number storage section 15...Erasing/writing operation detection section

Claims (1)

[Scope of Claims] A disk drive apparatus in which an optical head is moved to follow a predetermined track on a disk according to a command sent from a host disk controller, and is orientated to enable random access to the track, the disk controller comprising: write operation detection means for detecting the start and end of a write operation instructed by the optical head; track number detection means for detecting a track number followed by the optical head; and track number storage means for storing the track number. The starting track number at the start of the write operation is stored in the track number storage means, and the end track number detected by the track number detecting means at the end of the write operation is compared with the start track number, and both tracks are stored. A disk drive device characterized in that, if the numbers are different, the optical head is moved to the track corresponding to the start track number.