JPH06282972A - Disc recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a disk recording / reproducing apparatus for recording / reproducing a disk in which tracks are formed in a spiral shape, and shortens access time and rotation waiting time to achieve high-speed data recording operation. The purpose is to achieve [Structure] When recording new data on the magneto-optical disk 11, the optical head 2 at the time of transition to a state of erasing, recording, and confirmation.
The data amount corresponding to the access time of 6 is set in the host computer 22 as the subtracted data amount. Then, the control unit 23 sets the capacity obtained by subtracting the subtracted data amount from the storage capacity of the memory 24 as the maximum stored data amount.
Is configured to fetch the data from the host computer 22 into the memory 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording / reproducing a disk having tracks formed in a spiral shape.

[0002]

2. Description of the Related Art In recent years, a recording / reproducing apparatus such as a computer using a recording medium such as a magneto-optical disk has been widely used as a large-capacity recording. High-speed processing is required.

A conventional recording of data by a recording / reproducing apparatus using, for example, a magneto-optical disk in which recording / reproducing tracks are spirally formed will be briefly described. Is stored in a temporary memory, the old data of the magneto-optical disk corresponding to the data of this memory is erased, the new data is recorded, and the verify operation for confirming the recorded data is performed.

In this case, when the recording data amount is larger than the memory capacity, a series of operations of erasing, recording, and verifying on the magneto-optical disk are performed in memory capacity units, and when the recording data amount is smaller than the memory capacity, the recording data amount is smaller. The operations of erasing, recording and verifying are performed collectively.

For example, if the memory capacity is 128 KB,
Using a disk (ISO standard: 3.5 inch MO) with a recording capacity of 12.8 KB for one rotation of the magneto-optical disk,
Suppose that data of 640 KB is recorded on the magneto-optical disk.

First, after fetching 128 KB of data from the data sent from the host computer into the memory, the 128 KB of old data in the area for recording the data is erased. At this time, 12.8K per rotation of the disc
128KB / 1 because B data processing is performed
It takes 2.8 KB = 10 rotations. Next, when accessing the top address of the erased portion and recording the data in the memory as new data, it takes time for one rotation of the disk for the access and the rotation waiting time. Takes time.

Then, the recorded portion is accessed again, and a verify operation for confirming whether or not there is a defect in the recorded data is performed. Even at this time, the time required for one rotation of the disk is required for the access and the rotation waiting time, and the time required for the verification is required for 10 rotations. Therefore, 128 KB
When recording the recorded data of the above on an optical disc, 10 rotations +
1 rotation + 10 rotations + 1 rotation + 10 rotations = time required for 32 rotations of the disk.

That is, since the data of 640 KB is recorded, the processing is executed 5 times for each 128 KB, and 32 data is required for recording all the data of 640 KB.
Rotation × 5 = 160 rotations will be required.

[0009]

FIG. 5 is a diagram for explaining the access operation of the conventional disc recording / reproducing apparatus. FIG. 5 is a schematic view of the magneto-optical disk 11 in which the recording / reproducing track 11a is formed in a spiral shape.

Now, from the point A to the point B on the spiral track 11a of the magneto-optical disk 11, 128K
Assuming that the recording area is B, first, erasing from point A to point B is performed, and then data recording is performed. However, if it is possible to jump from the point B to the point A as shown by the solid line, there is no problem, but since the magneto-optical disk 11 is rotating, the point actually jumps to the point C. Therefore, when the jump destination is the point D, a waiting time is generated until the point A is reached, and the rise of each operation is delayed.

That is, in the case of the magneto-optical disk 11 having spiral tracks, access from the erasing operation end address to the recording operation start address, or
When the verify operation start address is accessed from the recording end address, the rotation waiting state of the magneto-optical disk 11 occurs, so that there is a problem that the rise of each operation is delayed and the data recording execution operation is delayed.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a disk recording / reproducing apparatus which shortens the access time and the rotation waiting time to speed up the data recording operation.

[0013]

SUMMARY OF THE INVENTION The above problem is that when new data is recorded by a head on a recording medium having recording / reproducing tracks formed in a spiral shape, the new data is temporarily stored and a recording area on the recording medium is recorded. In the disk recording / reproducing apparatus for confirming the recording after erasing the old data and recording the new data, the data amount corresponding to the access time of the head at the time of the state transition of the erasing, recording and confirming is changed from the storage capacity. And a storage unit for maximizing the stored data amount by the reduced capacity, and a control unit for causing the storage unit to fetch the new data within the maximum stored data amount range. Will be solved by.

[0014]

The amount of data to be stored in the storage means as described above
The maximum amount of data obtained by subtracting the data amount corresponding to the access time from the storage amount is set.

Therefore, FIG. 1 shows an explanatory view of the principle of the present invention. In FIG. 1, the recording medium 11 is shown as a schematic recording / reproducing track 11a formed in a spiral shape. Now, when recording is performed from the point A, a series of operations of erasing, recording, and confirming is performed. At the time of transition to the operating state, the amount of data EB corresponding to the access time is subtracted from the amount of storage AB of the conventional storage means. However, the head is accessed from the point E to the starting point A of each of the erasing, recording, and confirming points.
As a result, the waiting time to each head position after access is shortened, and the speed of data recording operation can be increased.

[0016]

FIG. 2 shows a block diagram of an embodiment of the present invention. FIG. 2 is a schematic block diagram of a magneto-optical recording / reproducing apparatus 21 as a disk recording / reproducing apparatus using a magneto-optical disk as a recording medium.

The magneto-optical recording / reproducing apparatus 21 of FIG. 2 is roughly classified into a host computer 22 and a control unit 2 which is a control means.
3, memory 24 as storage means, information recording / erasing unit 2
5, optical head 26, information reproducing section 27 and servo circuit 28
It is composed of

Deletion of information from the host computer 22,
A signal for instructing recording and reproduction (verification) for recording confirmation and a signal for information to be recorded are input to a control unit 23 including a CPU (central processing unit). At this time, in the host computer 22, a data amount corresponding to the access time when the operating state of the optical head 26 is moved in a series of operations of erasing, recording, and verifying during a data recording operation is set as a subtraction data amount. It

Then, the control section 23 fetches the information from the host computer 22 into the temporary memory 24. The memory 24 subtracts from the storage capacity the capacity for the time required for access, magnet reversal, etc., which is required when shifting from erasing to recording operation or recording to verify operation without taking in the data of storage capacity. The remaining capacity is treated as the amount of data to be acquired. That is, the memory 24 processes a smaller amount of data than the conventional storage capacity indicated by the broken line.

The information to be recorded and the signal for erasing the information output from the control unit 23 are input to the information recording / erasing unit 25, and the output thereof is given to the optical head 26. The optical head 26 projects the light beam LB onto the magneto-optical disk 11 for recording and reproducing information. The light amount of the projected light beam LB changes according to the output from the information recording / erasing unit 25 given thereto.

On the other hand, the optical head 26 is used for the magneto-optical disk 11
The reflected light from is received and sent to the information reproducing section 27 as a signal related to the recorded information, and its output is input to the control section 23. A signal output by the optical head 26 in relation to the amount of light received from the magneto-optical disk 11 is input to the servo circuit 28, and the output control signal controls focus and tracking of the optical head 26. Is sent to a driving unit (not shown) that is driven as described above.

Therefore, FIG. 3 shows a flowchart of the erasing, recording, and verifying operation of FIG. In FIG. 3, similarly to the above, the capacity of the memory 24 is set to 128 KB,
It is assumed that the magneto-optical disk 11 having a recording capacity of 12.8 KB for one rotation of the disk is used to record data of 640 KB. First, in the host computer 22, the memory 2
The subtracted data amount (described later) that determines the captured data amount in 4 is set (step (ST) 1).

Then, the data to be recorded is fetched into the memory 24 with the fetched data amount obtained by subtracting the subtracted data amount as an upper limit (ST2), and the equivalent old data in the data recording region is erased (ST3). Then, the head address of the erased portion is accessed by the optical head 26 (SR4), and the data in the memory 24 is recorded as new data (ST5).
The optical head 26 is accessed to the recorded portion again (ST
6) Then, a verify operation is performed to confirm whether the recorded data has a defect (ST7).

When one data recording is completed,
Whether or not there is unrecorded data is determined (ST8), and if unrecorded data exists, the process returns to ST2, and if there is no unrecorded data, the process ends.

FIG. 4 is a diagram for explaining the access operation of FIG. In FIG. 4, similarly to FIG. 5, the area from the point A to the point B of the track 11 a in the magneto-optical disk 11 is an area for the storage capacity of the memory 24.

Then, in order to eliminate the rotation waiting time after the access, the data from the points A to B is not recorded,
The data for the capacity from the point A to the point E is processed, and the point A to the point A is accessed. The distance from point E to point B is the distance that the disk advances in the time required for access. The rotation waiting time at the time of access can be eliminated by taking in and recording the amount of data obtained by subtracting the capacity for this BE from the capacity of the memory 24.

More specifically, the storage capacity of the memory 24 is 128 KB, the recording capacity for one rotation of the disk is 12.8 KB, and the access-only time is 4 KB as described above.
Sectors (4/25 rotations) are required. In this case, the recording capacity for 4 sectors is (12.8 KB / 2
5) x4 = 0.512 KB x 4 = 2.048 KB. Therefore, the amount of data taken into the memory 24 is 128 KB
It becomes −2.048 KB = 125.952 KB. That is, this data amount becomes the maximum fetch amount of the memory 24.

When recording this amount of data on a disc,
(125.952KB / 128 for one data processing
KB) × 10 rotations = 9.84 rotations are required. Since three operations of erasing, recording, and verifying are required for recording data once, time of 9.84 rotations × 3 = 29.52 rotations is required. Access time (4/25
= 0.16 rotations) is required twice, so 125.952
2 to record KB data on the magneto-optical disk 11.
9.52 rotations + (0.16 rotations × 2) = 29.84 rotations are required.

Here, if it is attempted to record data of 640 KB, the recording of data of 125.952 KB is 5 each.
And one recording with the remaining data capacity of 10.24 KB is required. 10.24KB is 10.24KB / 0.5
The capacity is 12 KB (1 sector) = 20 sectors. Since there is an area of 25 sectors per one rotation of the disk, 20/25 (0.8) rotations are performed for one data processing, 0.8 rotations × 3 = 2.4 rotations for one data recording, and 0 for access. ．
16 rotations × 2 = 0.32 rotations are required.

However, when one-time data processing and access time are examined, it becomes 0.8 rotation + 0.16 rotation = 0.96 rotation, which is less than one rotation of the disk. Therefore, one revolution-
A waiting time of 0.96 rotations = 0.04 rotations will occur.

As shown in FIG. 4, from point F to point G is 10.
Attempting to access from point G to point F at 24 KB, the actual access point becomes point H. This is a phenomenon that occurs because the access time is set within a certain range. Therefore, the rotation waiting time is from point H to point F. The time required to record 10.24 KB of data including this rotation waiting time is 2.4 rotations + 0.32 rotations + (0.
04 × 2) rotation = 2.8 rotations.

Therefore, in order to record data of 640 KB, it takes 29.84 rotations × 5 + 2.8 rotations = 152 rotations. That is, in the past, 64
In contrast to the time required for recording 0 KB of data for 160 revolutions, the present invention can shorten the time for 8 revolutions and speed up the data recording operation. Is.

In the above embodiments, the case where a magneto-optical disk is used as the recording medium has been described, but any recording medium having spiral tracks can be applied to a hard disk, a floppy disk or the like. is there.

[0034]

As described above, according to the present invention, the capacity obtained by subtracting the data amount corresponding to the access time of the head at the time of transition to the erasing, recording, and checking states from the storage capacity at the time of recording on the recording medium. By taking in the new data as the maximum amount of data stored in the storage means, it is possible to shorten the access time of the head and speed up the data recording operation.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a flowchart of the erasing, recording and verifying operations of FIG.

FIG. 4 is a diagram for explaining the access operation of FIG.

FIG. 5 is a diagram for explaining an access operation of a conventional disc recording / reproducing apparatus.

[Explanation of symbols]

 11 magneto-optical disk 11a track 21 magneto-optical recording / reproducing device 22 host computer 23 control unit 24 memory 25 information recording / erasing unit 26 optical head 27 information reproducing unit 28 servo circuit

Claims (1)

[Claims] 1. When recording new data by a head on a recording medium having recording / reproducing tracks formed in a spiral shape, the new data is temporarily stored, and old data in a recording area of the recording medium is erased. In a disc recording / reproducing apparatus for confirming recording after recording new data, a capacity obtained by subtracting a data amount corresponding to the access time of the head from the storage capacity at the time of the state transition of the erasing, recording and confirming is stored. A disk recording / reproducing apparatus comprising: a storage unit that maximizes a data amount; and a control unit that causes the storage unit to capture the new data within a maximum stored data amount range.