JPH06139736A - Head standby position controller for disk device - Google Patents

Abstract

PURPOSE:To prevent the wear and deterioration of a disk and to realize an efficient accessing by obtaining the average value of the address numbers of a seak track as a standby track from the sum of the address numbers of the seak track and the seeking number of times and seeking the track. CONSTITUTION:The loading of a disk 1 is discriminated by a CPU 9 and when it is discriminated to be YES, the seeking number of times and a total track are initialized to 0. A standby track=total track/seeking number of times is obtained to instruct a seeking to the standby track by a standby track control means 91. When a seek command is given, the seeking number of times(= seeking number of times +1) and the total track(=total track) (=total track- address number of seet track) are obtained and stored in a RAM 11. Control commands are given to a VCM controlling section 6 and a tracking control section 8 by a seek control means 92, the seeking of a head 3 for the disk 1 is carried out, a control command is given to a recording/reproducing control section 7 by a recording/reproducing controlling means 93 and data is recorded/ reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head standby position control device for a disk device which controls a head standby position with respect to a disk track.

[0002]

2. Description of the Related Art Recently, information is recorded by focusing and irradiating a recording medium with a laser beam modulated by external information, and irradiating the recording medium with a focused laser beam of a certain intensity. An optical disk device is used that is capable of reading the.

By the way, in such an optical disk device, when the optical disk is loaded in the device, the optical head emits a laser beam at a standby emission level (usually the same as the emission level during reproduction), and the emission beam is emitted at a predetermined level. Tracking at this position by accessing the waiting track,
It is a so-called head standby position in which a focusing servo is inserted, and it waits for the next recording, reproducing or erasing operation command from the host. in this case,
Whether the standby position of the head is appropriate or not is important in order to obtain a quick track access to the operation command given next.

Therefore, as a conventional method for determining the head standby position, the standby track of the head is set to the most frequently accessed track (area), as disclosed in JP-A-62-223866. In this way, as disclosed in Japanese Patent Laid-Open No. 62-243182, the standby track of the head is set in the central portion in the radial direction of the disk or near the file management area.
As disclosed in JP-A-63-247980,
For example, there is one in which the standby track of the head is set to the directory track at the center in the radial direction of the disk.

[0005]

However, in the case where the head is on standby in the track (area) that is accessed the most, the same track portion is always irradiated with the laser light of the standby emission level at the head standby position. At this portion, the material characteristics are likely to change, which causes the wear and deterioration of the disc to be accelerated. Also, in the case where the head is on standby in the central portion in the radial direction of the disk or near the file management area, if the track access is biased to the opposite side of the central portion in the radial direction of the disk or the file management area, the access time is rather slow. turn into.
Also in this case, since the head standby position is fixed, it is a cause of hastening wear and deterioration of the disk as described above. Furthermore, in the case where the head is put on standby in the directory track in the central portion in the disk radial direction, not only can it be applied only to a disk of a specific format, but in this case also, if the track access is biased to the opposite side to the directory track, The access time is delayed, and the head standby position is fixed, which is a cause of hastening wear and deterioration of the disk as described above.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a head standby position control device for an optical disk device which can prevent wear and deterioration of the optical disk and can realize efficient access.

[0007]

According to the present invention, there is provided an optical disk device in which a head is provided so as to face an optical disk, and the head can be sought in a direction orthogonal to a track of the optical disk. Means for seeking to the seek track, the sum of the address numbers of the seek tracks up to the present time which is sought by this means, and the average value of the address numbers of the seek tracks from the number of seeks, and the head track And means for seeking.

Further, according to the present invention, in an optical disc apparatus in which a head is provided so as to face the optical disc, and the head can be sought in a direction orthogonal to a track of the optical disc, an area in which effective information of the optical disc is recorded is recorded. Means for storing the respective addresses of the innermost track and the outermost track, means for seeking the head to a predetermined seek track on the optical disk, and the address of the seek track seeked by this means is the innermost track. If it is smaller than the address of the track, the address of the innermost track in the stored area is updated, and if the address of the seek track seeked by the means is larger than the address of the outermost track, the maximum address of the stored area is updated. A method to update the address of the outer track and this method The centers of the address of the innermost track and the outermost track is constituted by means for seeking the head to 該待 machine track as a standby tracks.

[0009]

As a result, according to the present invention, the sum of the seek track address numbers up to the present of the head seeking on a predetermined seek track on the optical disk and the average value of the seek track address numbers are waited from the number of seeks. Since the head is sought as the track and the head is sought to the standby track, the standby track can be constantly updated to set the head standby at a different position each time. Moreover, the value of the standby track can be made to converge near the frequently accessed track, so that the access time can be shortened when the track access is concentrated in a predetermined range.

Further, according to the present invention, the seek track address which is sought for each of the innermost track and the outermost track of the area in which the valid information of the optical disc is recorded is the innermost track. If it is smaller than the address, the address of the innermost track of the area is updated, and if the address of the seek seek track is larger than the address of the outermost track, the address of the outermost track of the area is updated to Since the center of each address of the updated innermost track and outermost track is used as a standby track and the head is sought to the standby track, when access is performed randomly without concentrating in a predetermined range. Can also shorten the access time on average for any access. Further, according to such random access, it is possible to update the standby track frequently and set the head standby at a different position.

[0011]

【Example】

 (First embodiment)

FIG. 1 shows a schematic configuration of the first embodiment. In the figure, reference numeral 1 denotes an optical disc, and this optical disc 1
Are rotated by the spindle motor 2. Further, a head 3 composed of an optical head is provided facing the optical disc 1, and the head 3 can be sought by a voice coil motor (VCM) 4 in the radial direction of the optical disc 1, that is, in the direction orthogonal to the track.

In this case, the spindle motor 2 is controlled by the spindle motor controller 5, and the VCM 4 is controlled by the VCM controller 6. A recording / reproducing control unit 7 and a tracking servo control unit 8 are connected to the head 3. The recording / reproduction control unit 7 controls recording / reproduction of data from the head 3 to the optical disc 1, and the tracking servo control unit 8 controls a tracking state of the head 3 with respect to the optical disc 1.

The control commands for the spindle motor control unit 5, VCM control unit 6, recording / reproduction control unit 7 and tracking servo control unit 8 are CP.
Given by U9. The CPU 9 has a standby track control means 91, a seek control means 92, and a recording / playback control means 93, which are operated by a command from a host (not shown).
Performs seek and recording / playback control, and executes standby track control for determining the head standby position.

A ROM 10 and a RAM 11 are connected to the CPU 9. Here, the ROM 10 stores a control program for the CPU 9. Further, the RAM 11 stores various data during operation. Next, in FIG.
6 shows a flowchart illustrating the operation of the first embodiment. First, the loading of the optical disc 1 is determined (step 201). Here, while the determination is NO, step 20
The state of 1 is retained.

Next, if YES is determined in step 201, the number of seeks is initialized to 0 in step 202, and then the total track is also initialized to 0 in step 203. The number of seeks here is the number of times the seek command is executed, and the total track is the sum of the address numbers of the track that was sought. The values of the seek count and total track are stored in the RAM.
11 is stored.

Next, in step 204, the standby track = total track / the number of seeks is calculated, and in step 205, the standby track control means 91 instructs the seek to the standby track.

Next, the ejection of the optical disc 1 is determined (step 206). If YES is determined here,
Return to the start. On the other hand, if NO is determined, it is determined whether there is a seek command (step 207). In this case, while it is determined to be NO, step 206, step 2
The state of 07 is retained.

From this state, a seek command is given, and if YES is determined in step 207, seek count = seek count + 1 (step 208), total track = total track + seek track address number (step 209) is obtained. , Are respectively stored in the RAM 11.

Then, the process proceeds to step 210, where the seek track is sought by the seek command. In this case, the seek controller 92 gives a control command to the VCM controller 6 and the tracking servo controller 8.
The seek of the head 3 with respect to the optical disk 1 is performed. Next, in step 211, data recording / reproduction is performed. In this case, a control command is given to the recording / reproducing control section 7 by the recording / reproducing control means 93 to record / record data.
Playback is performed.

Then, returning to step 204, the standby track = total track / the number of seeks is obtained, the seek to the standby track is executed in step 205, and the new seek track waits for the next seek command.

Thereafter, the operations of the above-described steps are repeated until YES is determined by the ejection of the optical disc 1 in step 206, and the standby track is updated along with the number of seeks.

The above operation will be described with reference to specific numerical values shown in FIG. 3. Initially, the initial values of the seek count, seek track, and total track are all 0, so the standby track is also 0. Next, when the first seek command is given, the number of seeks becomes 1, and if the seek track address number at this time is 1000, the total track (= total track + seek track address number) becomes 0 + 1000 = 1000. ,
The standby track (= total track / number of seeks) is
1000/1 = 1000. Next, when the seek command is given again, the number of seeks becomes 2, and when the address number of the seek track at this time is 5000, the total track is 1000 + 5000 = 6000.
Therefore, the number of waiting trucks is 6000/2 = 3000. Next, if the seek command is given again, the number of seeks becomes 3, and if the address number of the seek track at this time is 6000, the total track becomes 60.
00 + 6000 = 12000, and the waiting truck is
When the seek command is given, the number of seeks becomes 4, and when the address number of the seek track at this time is 2500, the total track is 12000 + 2500 = 145.
00, the standby truck is 14500/4 = 362
It becomes 5.

Therefore, in this way, when the address number of a predetermined seek track is given together with the seek command, the standby track is updated according to this and the head standby is set to a different position every time. The wear and deterioration of the disk can be prevented as compared with the conventional head standby position which is fixed. Further, in such a configuration, since the value of the standby track converges near the track with the highest access frequency, for example, track accesses are concentrated in a predetermined range so as to execute a specific application. In this case, the effect of significantly shortening the access time can be expected. (Second embodiment)

In the second embodiment, for example, an area for storing a history of 128 seeks, that is, a history of address numbers of seek tracks corresponding to each seek is prepared in the RAM 11, and the address numbers of the stored seek tracks are stored. The waiting track is calculated from the average of the sum of the above. In this case, the memory address for storing these histories is from 8000h indicated by the pointer to 80FFh,
Each seek track address number is stored in 2 bytes. Therefore, the configuration of the second embodiment is similar to that of FIG. 1 described above, and its operation is as shown in the flowchart of FIG. In this case, the seek count is initialized to 0 in step 401, and then the total track is also initialized to 0 in step 402. next,
The pointer is set to 8000h (step 403), and the standby track is also set to 0 (step 404). Then, in step 405, the standby track control means 91 instructs the standby track to seek. In this state, it is determined whether there is a seek command (step 406). in this case,
The state of step 406 is maintained while the determination is NO.

Thereafter, a seek command is given, and if YES is determined in step 406, the process proceeds to step 407, and it is determined whether or not seek count = 128. Here, NO
Therefore, the number of seeks = the number of seeks + 1 (step 408) and the total track = total track + address number of the seek track (step 409) are respectively obtained.

Then, the seek track address number is stored in the address indicated by the pointer (8000h in this case) (step 410), and the pointer is updated to pointer = (pointer + 2) and 80FFh (step 41).
1).

Next, in step 412, a seek command is used to seek the seek track. In this case, the seek control means 92 gives a control command to the VCM control section 6 and the tracking servo control section 8 to perform the seek of the head 3 with respect to the optical disk 1. Next, in step 413, data recording / reproduction is performed. In this case, recording / reproduction control means 93
A control command is given to the reproduction control unit 7 to record / reproduce data.

Then, in step 414, the standby track = total track / the number of seeks is obtained, and the seek to the standby track is executed in step 405 to wait for the next seek command in the new standby track. Thereafter, in the same manner, the operation of each step described above is repeated, and the standby track is updated along with the number of seeks.

In this case, the pointer is updated together with the number of seeks (step 411), and the address number of the seek track is sequentially stored at the address indicated by the updated pointer (step 410), but the number of seeks is 128. This operation is repeated until the number of times reaches, and the total track is also obtained as the sum of the address numbers of the seeked tracks.

When the number of seeks exceeds 128 and YES is determined in step 407, first, the seek track address number of the address indicated by the pointer (the seek track address number in this case is the oldest before 128 times). No.) from the total track (step 415), and then the address number of the latest seek track this time is added to the total track (step 40).
9) The address number of the seek track is stored in the address indicated by the pointer (step 410), and the history is updated. And the pointer is also pointer = (pointer + 2)
and 80FFh (step 41
1), and the above operation is repeated.

Therefore, in this way, the standby track is obtained from the average of the sum of the history of the address numbers of 128 seek tracks, so that even if the disk is used for a long time, the old history is affected. Without
The history of a relatively new period allows the waiting track to be determined. This makes it possible to obtain a standby track affected by the area of the disc currently being used, so that the access time can be shortened. Of course, the same effect as that of the above-described first embodiment can be expected. (Third embodiment)

In the third embodiment, the innermost track (address) and the outermost track (address) of the area in which the valid information of the disc is recorded can be updated by the address of the seek track, and the innermost track (address) is updated. The standby track is obtained from the center of the (address) and the outermost track (address). Thus, the configuration of the third embodiment is similar to that of FIG. 1 described above, and its operation is as shown in the flowchart of FIG.

First, the outermost track (address) is set to the address 0 of the innermost track of the usable area of the disk.
h (step 501), and then the innermost track (address) is set to the address 7FFFh of the outermost track in the available area of the disc (step 50).
2).

Then, in step 503, the standby track = (innermost track (address) + outermost track (address)) / 2 is obtained, and in step 504, the standby track control means 91 instructs the seek to the standby track. To be done. In this case, the address 7FFF of the innermost track
The standby rack is updated at the center of h and the address 0h of the outermost track. In this state, it is determined whether there is a seek command (step 505). In this case, the state of step 505 is maintained while the determination is NO.

After that, a seek command is given, and if YES is determined in the step 505, the process proceeds to a step 506, and the seek track is sought by the seek command. In this case, the seek control means 92 causes VC
A control command is given to the M control unit 6 and the tracking servo control unit 8 to seek the head 3 with respect to the optical disc 1.

Next, it is judged whether the track address sought in step 506 is larger than the address (= 0h) of the outermost track (step 507). Where YE
If S, the address of the outermost track is rewritten to the address of the seek track (step 508), step 509.
On the other hand, if NO, the process proceeds to step 509 without passing through step 508.

In step 509, it is determined whether the track address sought in step 506 is smaller than the innermost track address (= 7FFFh).
Here, if YES, the address of the innermost track is rewritten to the address of the seek track (step 510), and the process proceeds to step 511. If NO, step 510.
And goes to step 511.

In step 511, data recording / reproduction is performed. In this case, the recording / reproducing control unit 93 gives a control command to the recording / reproducing control unit 7 to record / reproduce data.

Then, the process returns to step 503 to obtain standby track = (innermost track (address) + outermost track (address)) / 2 again, and the following step 504.
Then, the standby rack is updated to the center of the address of the innermost track and the address of the outermost track rewritten in steps 508 and 510.

Similarly, if the track address sought in step 506 is larger than the address of the outermost track at that time, the address of the outermost track is rewritten to the address of the seek track (step 508). Alternatively, if it is smaller than the address of the innermost track at that time, the address of this innermost track is rewritten to the address of the seek track (step 5).
10) The addresses of the latest innermost track and outermost track are obtained, and the standby track is updated at the center of these addresses (step 503,
504).

Therefore, in this way, the standby track can be obtained from the center of the address of the innermost track and the address of the outermost track of the area where the valid information of the disk is recorded. If only a part of the area is used (usually this is the case), and when access is performed randomly without concentrating on a predetermined range, such as when executing multiple applications at the same time, An average access time can be shortened for any access. Also, with such random access, it is possible to update the standby track frequently and set the head standby to a different position. Therefore, compared to the conventional head standby position which is fixed, the disk Wear and deterioration can be prevented. (Fourth embodiment)

The fourth embodiment is a case where a fixed medium such as a hard disk is used as the disk. In this case, the disk will not be replaced, so remember the latest area information so that it will not be lost even when the power is turned off, and read the area information that was stored when the power was turned on. I try to get the best waiting truck.

In this case, the CPU 9 of FIG.
The EPROM 12 is connected. The other construction of the fourth embodiment is similar to that of FIG. 1, and its operation is as shown in the flowchart of FIG.

First, the addresses of the outermost track and the innermost track of the disk used area up to the previous time are read from the EEPROM 12 (steps 601 and 602).

Then, in step 603, the standby track = (innermost track (address) + outermost track (address)) / 2 is obtained, and in step 604, the standby track control means 91 instructs the seek to the standby track. To be done. In this case, the standby rack is updated at the center of the addresses of the innermost track and the outermost track read from the EEPROM 12.

Next, it is judged whether or not there is a format command (disk initialization command) (step 60).
5). If NO here, then it is determined whether or not there is a seek command (step 606). In this case, the states of step 605 and step 606 are maintained while the determination is NO.

Thereafter, a seek command is given, and if YES is determined in step 606, the operations of steps 6061, 607 to 611 are executed in the same manner as in FIG. 5 described above, and the track seeked in step 6061 is executed. If the address is larger than the address of the outermost track at that time, the address of this outermost track is rewritten to the address of the seek track (step 608), or if it is smaller than the address of the innermost track at that time, this address is written. The address of the innermost track is rewritten to the address of the seek track (step 61).
0), the addresses of the latest innermost track and outermost track are obtained, and the standby track is updated at the center of these addresses (steps 603, 6).
04). In this case, in the update of the address of the outermost track in step 608 and the update of the address of the innermost track in step 610, the contents stored in the EEPROM 12 are rewritten.

On the other hand, in step 605, a format command (disk initialization command) is given and YE
If it is determined to be S, the contents stored in the EEPROM 12 are rewritten to the outermost track address of the disk = 0h and the innermost track address = 7FFF (steps 612 and 613), and then the format command is executed (step 614). .

In the above description, when updating the address of the outermost track, when updating the address of the innermost track and when executing the format command, EEPRO, respectively.
Although the contents stored in M12 are rewritten, they may be collectively executed when the power is turned off. In addition, even if the address of the outermost track or the address of the innermost track is changed by erasing the data, the EEPR
The contents stored in the OM 12 are updated.

Therefore, in this way, when using a hard disk or the like without disk replacement, the latest area information is stored in the EEPROM 12 even when the power is turned off, and is stored in the EEPROM 12 when the power is turned on. Since the area information that has been read is used, the optimum standby track can be set from the beginning. Also in this case, the standby track is obtained from the center of the address of the innermost track and the address of the outermost track of the area in which the valid information of the disc is recorded, so that the same effect as that of the third embodiment can be obtained. Of course, you can expect it. Besides, the present invention is not limited to the above-mentioned embodiments, and can be carried out by appropriately modifying without departing from the scope of the invention.

[0052]

According to the present invention, the average value of the seek track address numbers is the sum of the seek track address numbers up to the present of the head seeking a predetermined seek track on the disk and the average value of the seek track address numbers. Since the head seeks to the stand-by track, the stand-by track can always be updated to set the head stand-by at a different position each time. It is possible to prevent wear and deterioration of the disc. Further, since the value of the standby track can be made to converge near the frequently accessed track, the access time can be greatly shortened when the track access is concentrated in a predetermined range.

Further, according to the present invention, the seek track addresses sought with respect to the respective addresses of the innermost track and the outermost track of the area where the valid information of the disc is recorded are the innermost track. If it is smaller than the address, the address of the innermost track of the area is updated, and if the address of the seek seek track is larger than the address of the outermost track, the address of the outermost track of the area is updated to Since the center of each address of the updated innermost track and outermost track is used as a standby track and the head is sought to the standby track, when access is performed randomly without concentrating in a predetermined range. Can also significantly reduce access time on average for any access. Also, with such random access, it is possible to frequently update the standby track and set the head standby to a different position, and wear and deterioration of the disk compared to the conventional head standby position is fixed. Can also be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the first embodiment.

FIG. 3 is a diagram for explaining the operation of the first embodiment.

FIG. 4 is a flowchart for explaining the operation of the second embodiment of the present invention.

FIG. 5 is a flowchart for explaining the operation of the third embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of the fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Optical disc, 2 ... Spindle motor, 3 ... Head,
4 ... Voice coil motor (VCM), 5 ... Spindle motor control section, 6 ... VCM control section, 7 ... Recording / playback control section, 9 ... CPU, 91 ... Standby track control means, 92 ...
Seek control means, 93 ... Recording / reproduction control means, 10 ... R
OM, 11 ... RAM12 ... EEPROM.

Claims (2)

[Claims] 1. A disk device comprising a head facing a disk, the head being capable of seeking in a direction intersecting a track of the disk, and means for seeking the head to a predetermined seek track on the disk, A means for seeking the head to the standby track while obtaining the average value of the address numbers of the seek tracks from the sum of the address numbers of the seek tracks up to the present time and the number of seeks by this means A head standby position control device. 2. A disk device, wherein a head is provided so as to face the disk, and the head can be sought in a direction intersecting with a track of the disk, and an innermost track of an area in which valid information of the disk is recorded. Means for storing each address of the outermost track, means for seeking the head to a predetermined seek track on the disk, and the address of the seek track seeked by this means is smaller than the address of the innermost track And the address of the innermost track of the stored area is updated, and if the address of the seek track seeked by the means is larger than the address of the outermost track, the address of the outermost track of the stored area is updated. The means for updating, the innermost track and the Head waiting position control apparatus characterized by the respective centers of the addresses of peripheral tracks and means for seeking the head to 該待 machine track as the standby tracks.