JPH0863877A - Disk apparatus - Google Patents

Abstract

PURPOSE: To obtain a disk apparatus whose processing time is shortened by a method wherein, regarding the tip part of a band to be reproduced later, information which has been stored in advance is used instead of reproducing information. CONSTITUTION: A laser beam BL which is emitted from a pickup 4 is controlled by a signal which is given to a laser drive circuit 8. A memory 9 and a nonvolatile memory 10 are used by the controller 8. Then, information (reproducing information) in the rear end part and that in the front end part of every band are stored in advance in the memory 9. A buffer track exists between the rear end part of a user region in a band (n) and the tip part of a user region in a next band (n+1). Then, a reproducing operation is performed in a disk apparatus of a ZCAV system. Thereby, even a reproducing operation which strides a boundary between two bands can be reproduced nearly in the same time as a reproducing operation inside one band.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ZCAV type disc device, and more particularly to a disc device which enables a quick spot movement even when reproducing an area which crosses a boundary between two bands.

[0002]

2. Description of the Related Art In recent years, in order to improve the recording density of a recording medium, the number of rotations on the inner and outer circumferences is constant, and recording and reproduction are performed at a recording and reproduction frequency that is higher toward the outer peripheral side. A recording method for increasing the recording density, a so-called ZCAV method has been proposed. This ZC
In an AV type disk device, there is a region called a buffer track where recording / reproduction is prohibited at the boundary between bands, so that when reproducing information in a region that crosses the boundary between two bands. Requires, for example, a seek operation of the pickup to reproduce the spot to the end of the previous band and then cross the spot to the end of the next band and the buffer track in the middle.

That is, in the case of a reproducing operation that crosses the boundary between two bands, a buffer track exists in the middle of the reproducing operation, so that a spot moving operation (seek operation) is required as compared with the case of reproducing only one band. However, there is a problem in that an extra processing time is required and the reproduction operation becomes slower as a result. As one conventional measure for solving such a problem, an information recording / reproducing apparatus has been proposed which is configured to perform a kick operation when the head moves to another zone beyond the present zone (Japanese Patent Laid-Open No. Hei 11 (1999) -264242). 2-199
666).

According to this device, it is possible to speed up the spot movement from one zone to another zone. However, simply increasing the moving speed of the spot between the zones cannot necessarily speed up the reproducing operation and the recording operation.

[0005]

SUMMARY OF THE INVENTION The present invention is a conventional Z
It is an object of the present invention to provide a CAV type disk device, particularly a disk device that enables a quick spot movement when reproducing an area that crosses a boundary between two bands (claims 1 to 12). Invention).

[0006]

According to the present invention, firstly,
A recording medium is divided into a plurality of bands each including a plurality of tracks, a pickup that records and reproduces information at different recording and reproduction frequencies that are constant in each band and different in different bands, and the pickup is moved to a target track. In a disc device having means, a storage means for storing in advance the information written in the tip portion of each band, and when the pickup reproduces across the band boundary, the reproduction is performed later. Is not performed, and instead, control means for controlling so that the information stored in advance in the storage means is reproduced instead of the reproduction information.

Secondly, the recording medium is divided into a plurality of bands each including a plurality of tracks, and within each band is constant,
In a disk device having a pickup for recording / reproducing information at different recording / reproducing frequencies in different bands and a means for moving the pickup to a target track, the information written at the rear end of each band is stored in advance. If the storage means to be stored and the pickup crosses a band-to-band boundary, the rear end portion of the band to be reproduced first is not reproduced, and instead is stored in the storage means in advance. A control means for controlling the stored information to be reproduced instead of the reproduced information.

Thirdly, the recording medium is divided into a plurality of bands each including a plurality of tracks, and within each band is constant,
In a disk device having a pickup for recording / reproducing information at different recording / reproducing frequencies in different bands, and a means for moving the pickup to a target track, information written in the front end portion and the rear end portion of each band is recorded. In the case where the pickup means stores in advance and the pickup crosses a band-to-band boundary, the rear end of the band to be reproduced first and the front end of the band to be reproduced later are reproduced. Instead, the control means controls the information stored in advance in the storage means to be reproduced instead of the reproduction information.

Fourthly, in the above-mentioned first to third disk devices, functions such as prefetch, LRU, and write cache, and a second storage means for the functions are used as a tip end portion and / or rear end of the band. A function of sharing a storage means for storing information written in the end portion in advance, and a distribution means for distributing the capacity of the shared storage means to the various functions such as the prefetch at an arbitrary ratio. It is a configuration provided.

Fifth, in the above-mentioned fourth disk device, a counting is performed to count the number of executions of each of the reproduction operation across the band boundary, the reproduction operation not across the band boundary, and the recording operation. And a distributed storage capacity calculating means for calculating the storage capacity of the storage means for each of the functions, the front end of the band, and the rear end of the band from the counting result of the counting means. It is a composition.

Sixth, in the above-mentioned first to fifth disk devices, the functions such as prefetch, LRU, and write cache, and the second storage means for these functions are used as the tip and / or rear end of the band. A function of sharing a storage means for storing information written in the end portion in advance, and a distribution means for distributing the capacity of the shared storage means to the various functions such as the prefetch at an arbitrary ratio. It is a configuration provided.

Seventh, in the fifth disk device, a non-volatile memory as a storage means for storing the counting result by the counting means, and an arithmetic means for adding the counting result to the contents of the nonvolatile memory. It is a configuration provided with.

Eighth, in the fifth disk device, there is provided recording means for recording the counting result by the counting means on the disk, and computing means for adding the counting result to the contents on the disk. It has a different structure.

Ninth, in the first to eighth disk devices, when the disk is inserted or when the power is turned on with the disk inserted, the tips of the respective bands,
Alternatively, there is provided a structure including a reproducing means for reproducing the rear end of each band, or the front end and rear end of each band, and a recording means for recording the reproduced information in the storage means.

Tenthly, in the ninth disk device, for the front end of each band, the rear end of each band, or the front end and the rear end of each band, in which information is stored in advance, When a new recording is performed, information update for updating the information of the front end of each band, the rear end of each band, or the front end and the rear end of each band, which is already stored in the storage means. This is a configuration including means.

Eleventh, in the first to tenth disk devices, the front end of each band, the rear end of each band, or the front and rear ends of each band in which information is stored in advance is stored. This is a configuration including means for changing the amount according to the rotation speed of the disk.

Twelfth, in the first to eleventh disk devices, the front end of each band, the rear end of each band, or the front end and the rear end of each band in which information is stored in advance is stored. This is a configuration including means for changing the amount according to the type of the disc.

[0018]

According to the present invention, in the ZCAV type disk device in which the recording density of the recording medium is improved, when reproducing the information between the two bands, the buffer track existing at the boundary between the bands is picked up. Since it requires a seek, the processing time is longer than that in the reproduction in one band. However, if the information existing between the bands is stored in the storage means in the device in advance, the presence or absence of the buffer track Focusing on the point that the reproducing operation can be performed quickly regardless of the above, the processing time of the ZCAV type disk device can be shortened (the inventions of claims 1 to 12).

[0019]

[Embodiment 1] Next, regarding the disk device of the present invention,
The embodiments will be described in detail with reference to the drawings. This embodiment corresponds to the inventions of claims 1 to 3, but is also related to the inventions of claims 4 to 12.

In the first embodiment, the front end (invention of claim 1) and the rear end (invention of claim 2) of each band, or the front end and the rear end of each band (in claim 3). invention)
The information written in the storage means is stored in advance in the storage means, and at the time of the reproduction operation that crosses the boundary between the two bands, the seek operation of the pickup is made unnecessary by reproducing the information stored in advance in the storage means, It has a feature in that it can be quickly reproduced.

FIG. 1 is a functional block diagram showing an embodiment of the main configuration of the disk device of the present invention. In the figure, 1 is a storage medium, 2 is a spindle motor, 3 is a rotation control system, 4 is a pickup, 5 is a laser drive circuit, 6 is a signal detection unit, 7 is an actuator control system,
Reference numeral 8 is a drive controller, 9 is a memory, 10 is a non-volatile memory, 11 is an external interface section, 12 is a switch section, LB is a laser beam, and SP is a light spot.

The disk device shown in FIG. 1 is different from the disk controller shown in FIG. 1 in that the drive controller 8 performs control according to the flow shown in FIGS. 4, 6, and 7 described later, and that a nonvolatile memory 10 is added. For example, it is basically the same as the conventional configuration. First, the outline of the configuration and operation common to the conventional one will be described.

The information recorded on the storage medium 1 such as a disk is based on the reflected light from the light spot SP formed on the storage medium 1 by the pickup 4 as shown by the thick line, and the signal detection unit 6 Played by. The reproduced information is transferred from the external interface unit 11 to a host device (not shown) or the like via the drive controller 8.

In this case, the light spot SP formed on the storage medium 1 is moved to an arbitrary position on the storage medium 1 by the drive controller 8 moving the pickup 4 via the actuator control system 7. It is a movable structure. In FIG. 1, the rotation control system 3 that controls the rotation of the storage medium 1 also has a function of changing the rotation speed, the rotation direction, and the like of the spindle motor 2 by a control signal that is also supplied via the drive controller 8. ing.

The laser beam LB emitted from the pickup 4 is controlled by the drive controller 8 by a control signal provided to the laser drive circuit 5. The memory 9 and the non-volatile memory 10 are storage means used by the drive controller 8 that controls the system, and in this embodiment, information stored in advance at the leading end and the trailing end of each band on the storage medium 1 is mainly used. Used to record.

Next, an example of the layout of the data area of the storage medium in the ZCAV system will be described.
Here, ECM of 230MB, 90mm optical disc
An example of the A standard (European standard) is shown.

FIG. 2 is a diagram showing an example of the layout of the data area of a ZCAV storage medium.

As shown in FIG. 2, in the ZCAV type storage medium, control areas (Inner Control Zone, Out) are provided on the inside and the outside, respectively.
erControl Zone), and a data area (Data Zone) is provided in the central portion. The data area is in bands 0 to 9 (Band 0 to Ba).
nd 9).

Each band is provided with buffer tracks on both ends thereof.
In the playback operation that crosses the boundary between two bands, it is necessary to move the pickup from the user area (User Area) of one band to the user area (User Area) of the next band, which is a disadvantage in that the seek operation takes time. was there.

In the disk device of the present invention, in order to save the seek operation time required in such a case, information (reproduction information) at the rear end and the front end of each band is previously stored in the memory 9 of FIG. It is stored in (storage means). This state will be described with reference to FIG.

FIG. 3 is a diagram conceptually showing the layout of the boundary between two bands in the disk device of the present invention. In the figure, the shaded area indicates an area in which information is stored in advance.

In FIG. 3, bands n and (n + 1) are shown, and the rear end of the user area of band n and
A buffer track exists between the end of the user area of the next band (n + 1). In the following description, the front end buffer means a memory in which the information on the front end of the band is stored in advance, and similarly, the rear end buffer means the memory in which the information on the rear end of the band is stored in advance. Is meant.

FIG. 4 is a flow chart showing the main processing flow at the time of reproduction in the disk device of the present invention. In the figure, # 1 to # 11 indicate steps.

At step # 1, it is judged whether or not the area to be reproduced extends over two bands. If it does not straddle the two bands, proceed to step # 10.

On the other hand, when the band is over two bands, the process proceeds to step # 2 to judge whether or not the reproduction start position is before the rear end buffer. If it is before the rear end buffer, in the next step # 3, reproduction is performed up to immediately before the rear end buffer, and the process proceeds to step # 4.

Further, as a result of the judgment made in the previous step # 2,
Even when it is not before the rear end buffer, the process proceeds to step # 4. In step # 4, the information in the rear end buffer is read and transferred.

In step # 5, it is determined whether the reproduction end position is after the leading end buffer. If it is after the front end buffer, in step # 6, seek is started after the front end buffer.

In step # 7, the information in the front end buffer is read and transferred. At step # 8, the process waits until the seek operation is completed.

In step # 9, the area to be reproduced is
It is judged whether or not the boundary of the next band will also be straddled. If it also crosses the boundary of the next band, the process returns to the previous step # 3 and the same processing is repeated.

When it is determined in step # 9 that the band does not cross the boundary of the next band, the next step # 10
Go to. In step # 10, the reproduction operation is performed to the reproduction end position, and the flow of FIG. 4 ends.

Further, as a result of the judgment in the previous step # 5,
If it is not after the front end buffer, the process proceeds to step # 11, the information in the front end buffer is read and transferred up to the reproduction end position, and the flow of FIG. 4 is ended.

By the processes of steps # 1 to # 11 described above, the reproducing operation in the ZCAV type disk device is performed. In the disk device of the present invention, by such control (algorithm), it is possible to process the reproducing operation across the boundary between two bands in substantially the same time as the reproducing operation in one band (claim). Invention of Item 1).

Further, similarly to the above-described processing, that is, not the leading end portion of the band to be played back later, but the trailing end portion of the band to be played back first, previously stored information is used instead of the playing information. It is also possible to use (the invention of claim 2). Also in this case, since it is not necessary to reproduce the portion where the original information is recorded, the processing time can be shortened.

Furthermore, it is also possible to use information stored in advance in place of the reproduction information for both the rear end of the band to be reproduced first and the front end of the band to be reproduced later (claim 3). Invention). Also in this case, since it is not necessary to reproduce the portion where the original information is recorded, the processing time can be shortened.

As described above, in the first embodiment, the front end of the band to be reproduced later (the invention of claim 1) or the rear end of the band to be reproduced first (the invention of claim 2), Alternatively, regarding the rear end of the band to be reproduced first and the front end of the band to be reproduced later (the invention of claim 3), the information stored in each of those parts is stored in the storage means of the device (the memory of FIG. 1). 9), the information stored in advance in the memory 9 serving as a storage means is used instead of the reproduction information when the information of that portion is reproduced. Therefore, even in the reproducing operation that crosses the boundary between the two bands, it is not necessary to reproduce that portion, and the processing time is shortened.

[0046]

Second Embodiment Next, a second embodiment will be described. This second
The embodiment corresponds to the invention of claim 4, but is also related to the inventions of claims 1 to 3.

In the first embodiment, the front end (the invention of claim 1) or the rear end (the invention of claim 2) of each band, or the front end and the rear end of the band (claim 3) is used. Invention)
The information written in the storage means is stored in advance in the storage means, and at the time of the reproduction operation that crosses the boundary between the two bands, the seek operation of the pickup is made unnecessary by reproducing the information stored in advance in the storage means, The case where the quick playback operation is enabled has been described. In the second embodiment, in the disk device according to any one of claims 1 to 3, functions such as prefetch, LRU, and write cache, and a second storage means for these functions are provided as a tip portion of a band and / or. It is intended for a device having a function of sharing a storage means for storing information written in the rear end portion in advance.

Since the storage capacity of the storage means is finite, in the case of such a disk device, prefetch, LRU,
It is necessary to allocate the storage capacity of the storage means with a predetermined distribution value for various functions such as a write cache and for storing the front end and the rear end of each band. By the way, for each of these functions, the larger the storage capacity allocated, the more advantageous it is to increase the speed of the reproducing or recording operation.

On the other hand, in the disk device, the frequency of use of the storage means differs for each function according to the type of usage (usage method) thereof, so fixing the distribution is not always optimal. It is not allocated. The second embodiment is characterized in that the capacity distribution of the storage means is appropriately determined in accordance with the difference in the frequency of use of each function.

FIG. 5 is a diagram showing the distribution status inside the memory in the second embodiment of the disk device of the present invention.

FIG. 5 shows the distribution status for each function in the memory 9 shown in FIG. The distribution ratio for each function is set by the drive controller 8 in FIG. 1. The ratio is a value preset in the drive controller 8 or a value given by a command via the external interface 11, Alternatively, the value set by the switch unit 12 or the like is used.

As described above, by allocating the capacity of the storage means according to the difference in the importance of each function, the processing speed of the reproducing or recording operation can be adjusted according to the method (usage form) in which the apparatus is used. Can be increased sufficiently. In summary, the above first embodiment (the inventions of claims 1 to 3)
In this case, since there is no function for arbitrarily setting the capacity distribution of the storage means, the processing speed of the disk device may not be sufficiently drawn out. However, in the second embodiment, the capacity distribution of the storage means is distributed. By adding the function of performing the above, it becomes possible to effectively bring out the processing speed of the reproducing or recording operation according to the usage method (the invention of claim 4).

[0053]

Third Embodiment Next, a third embodiment will be described. This third
This embodiment corresponds to the invention of claim 5, but is also related to the invention of claim 4.

In the above second embodiment, prefetch, L
Functions such as RU and write cache, and a function of sharing a storage means for pre-storing the information written in the leading end portion and / or the trailing end portion of the band as a second storage means for these functions The case where the distribution of the capacity of the storage means is appropriately set according to the difference in the frequency of use of each function has been described for the device provided with (invention of claim 4). In this case, in order to properly allocate the capacity, it is necessary to know the frequency of use of each function in the usage method and to allocate the capacity of the storage means according to the ratio.

Therefore, in the second embodiment, the user of the disk device separately obtains information on the frequency of use of each function and sets the distribution of the storage capacity. This third
In this embodiment, by obtaining information on the frequency of use of each function corresponding to the usage pattern of the apparatus, the optimal allocation of storage capacity for the usage pattern can be set.

More specifically, depending on the usage of the device, the prefetch, LRU, and
The storage capacity required for each function such as write cache, and the reproduction / recording operations that cross band boundaries and the playback / recording operations that do not cross band boundaries when performing playback and recording operations. The required storage capacity becomes a problem, so playback across band boundaries
For recording operations and playback / recording operations that do not cross band boundaries, the number of executions of each operation is counted to obtain information on the frequency of use of each function corresponding to the usage pattern, and the allocation of storage capacity Is set (the invention of claim 5).

Such an operation is performed every time the drive controller 8 shown in FIG. 1 executes a reproducing / recording operation across a band boundary and a reproducing / recording operation not across a band boundary. , The number of executions of each is counted, and the distribution of the memory 9 of FIG. 1 (storage capacity for each function as shown in FIG. 5) is set according to the result of the number of executions. Therefore,
The capacity of the storage means is optimally distributed to the usage mode (usage method) of the disk device, and the processing speed of the reproducing operation and the recording operation can be sufficiently increased.

[0058]

Fourth Embodiment Next, a fourth embodiment will be described. This fourth
This embodiment corresponds to the invention of claim 6, but is also related to the inventions of claims 1 to 5.

In the disk devices of the first to third embodiments described so far, since the bands have different recording densities, naturally, the amount of recorded information reproduced per unit time also differs. That is, the higher the recording density of the band, the higher the data transfer rate of the reproduction information.

However, since the number of buffer tracks existing at the boundary of each band is almost the same at any boundary, the time required for the spot movement to cross the buffer track is almost the same at any boundary. Is the length. As a result, when performing a reproducing operation across bands, there is a problem that the lower the transfer rate becomes, the larger the boundary between the bands having a higher recording density.

In the fourth embodiment, the amount of the front end portion of each band or the rear end portion of the band, or the front end portion and the rear end portion of the band, which are stored in advance in the memory 9 as the storage means,
It is characterized in that it is changed for each band according to the recording density. In this way, when the amount of the front end and / or the rear end of the band is changed for each band, the boundary between the bands having a higher recording density becomes closer to the front end of the band or the rear end of the band to be stored in advance. Since it is possible to increase the amount of the band, or the leading end and the trailing end of the band, it is possible to prevent the disadvantage of a large decrease in the transfer rate at the boundary of the band having a higher recording density.

[0062]

Fifth Embodiment Next, a fifth embodiment will be described. This fifth
This embodiment corresponds to the invention of claim 7, but is also related to the invention of claim 6 above.

In the case of the disk device described in the fourth embodiment, in order to perform the capacity distribution of the storage means most suitable for the usage of the disk device, the reproducing operation across the bands and the band operation are performed. It is necessary to retain the information obtained by counting the number of times each of the reproduction operation without recording and the recording operation is executed. For that purpose, it is necessary to actually operate the disk device for a certain period of time.

Therefore, immediately after the disk device is activated, the information necessary for allocation cannot be obtained.
There is a problem that an appropriate capacity allocation cannot be performed, and as a result, an operation at a sufficient processing speed cannot be performed. In the fifth embodiment, by including the non-volatile memory 10 shown in FIG. 1, information on the number of times of each operation performed before that is held, and the number of times of the subsequent operation is stored in the contents of the non-volatile memory 10. The feature is that the storage capacity can always be appropriately distributed in accordance with the usage mode by adding to.

Also in this fifth embodiment, the drive controller 8 of FIG. 1 performs the operation of storing the information of the counting result of each operation in the non-volatile memory 10. Therefore, the fourth
The inconvenience in the above embodiment is solved, and the capacity distribution of the storage means (memory 9 in FIG. 1) can be immediately set optimally according to the usage pattern.

[0066]

Sixth Embodiment Next, a sixth embodiment will be described. This 6th
This embodiment corresponds to the invention of claim 8 but is also related to the invention of claim 6 above.

In the case of the disk device described in the above fourth and fifth embodiments, the same device may be used in different usages. In this way, if the usage methods are different, even if the information of the counting result of each operation stored in the non-volatile memory 10 is read out, it is not always possible to perform the optimal capacity distribution.

In the sixth embodiment, paying attention to the fact that the discs are different depending on the method of use, the information of the counting result of the number of executions of each operation is recorded on each disc, and when it is inserted into the disc device. It is characterized in that the capacity can be optimally distributed according to the usage method by reading the information. Therefore, by reading the information from the inserted disc, the capacity distribution of the storage means (memory 9 in FIG. 1) can be optimally set immediately according to the usage pattern, and the fourth or fifth embodiment described above can be performed. The inconvenience in the example is solved.

Also in the sixth embodiment, the drive controller 8 of FIG. 1 performs the operation of storing the information of the counting result of each operation in the non-volatile memory 10. Therefore, the inconvenience in the fifth embodiment is similarly solved, and the capacity distribution of the storage means (memory 9 in FIG. 1) can be immediately set optimally according to the usage pattern.

[0070]

Seventh Embodiment Next, a seventh embodiment will be described. This 7th
The embodiment corresponds to the invention of claim 9 but is also related to the inventions of claims 1 to 8.

In the disk device described in the first embodiment, the front end portion (invention of claim 1) or the rear end portion (invention of claim 2) of each band, or the front end portion and the rear end of each band. By storing the information written in the end portion (invention of claim 3) in the storage means in advance and reproducing the information stored in the storage means at the time of the reproducing operation crossing the boundary between the two bands, The seek operation of the pickup is not required, and quick playback is possible.

As described above, the memory 9 shown in FIG. 1 which is a storage means stores the information written in the leading end portion and the trailing end portion of each band in advance, so that the reading can be performed quickly during the subsequent reproduction. However, the seventh embodiment is characterized in that it is stored in the memory 9 when the disc is inserted or when the power is turned on while the disc is inserted. Next, the algorithm executed by the drive controller 8 in the seventh embodiment will be described with reference to the flowchart of FIG.

FIG. 6 is a flow chart showing the main processing flow when the power is turned on in the disk device of the present invention. In the figure, # 21 to # 24 indicate steps.

When the power of the disk device is turned on, the flow of FIG. 6 starts, and it is checked in step # 21 whether a storage medium is inserted. Then, when it is detected that the storage medium is inserted, step # 2
At 2, the type of storage medium is determined.

In the next step # 23, the rotational speed corresponding to the type of the storage medium determined is set.
In step # 24, the storage capacity of the front end portion / rear end portion of each band to be stored in advance is determined, and the flow of FIG. 6 ends.

The flow of FIG. 6 is also executed by the drive controller 8 of FIG. Therefore, in the drive controller 8, distribution information of the storage means (memory 9) corresponding to the type of storage medium or the rotation speed is stored in advance.

[0077]

Eighth Embodiment Next, an eighth embodiment will be described. This 8th
This embodiment corresponds to the invention of claim 10 but is also related to the invention of claim 9 above. In the disk device described in the seventh embodiment, the information of the leading end portion or the trailing end portion, or the leading end portion and the trailing end portion of each band, which is stored in the storage means in advance, is recorded thereafter. Then, the information of both parties will not match.

In the eighth embodiment, in order to avoid such inconsistency of prestored information, the information recorded on the storage medium and the information prestored in the storage means are always matched. It has a feature in making it. Next, the algorithm executed by the drive controller 8 in the eighth embodiment will be described with reference to the flowchart of FIG.

FIG. 7 is a flow chart showing the main processing flow at the time of recording on the storage medium in the disk device of the present invention. In the figure, # 31 to # 34 indicate steps.

At step # 31, it is checked whether a recording command has been received. When the reception of the recording command is detected, it is determined in step # 32 whether or not the newly recorded area on the storage medium includes the front end / rear end buffer.

If the newly recorded area includes the front end / rear end buffer, the process proceeds to step # 33, and the contents of the corresponding front end / rear end buffer are newly recorded information. To update. In the next step # 34, the information (recorded information) instructed to be recorded is recorded in the storage medium, and the flow of FIG. 7 ends. Therefore, in the drive controller 8, distribution information of the storage means (memory 9) corresponding to the type of storage medium or the rotation speed is stored in advance.

[0082]

[Ninth Embodiment] Next, a ninth embodiment will be described. This 9th
The embodiment corresponds to the invention of claim 11, but is also related to the inventions of claims 1 to 10.

In the disk device described in the first to eighth embodiments, disks having different rotation speeds have different recording information amounts reproduced per unit time even if the recording density is the same. That is, the higher the rotation speed of the disc, the higher the data transfer rate of the reproduction information.

On the other hand, the distance to move the spot when straddling the buffer track existing at the boundary of each band is always constant regardless of the rotation speed of the disc. Therefore, in the case of reproducing across bands, there is a problem that the transfer rate decreases more when the disc has a higher rotation speed.

In the ninth embodiment, in order to prevent such a decrease in transfer rate, the front end of each band, the rear end of each band, or the front end and rear end of each band are stored in advance. It is characterized in that the amount of is changed according to the rotation speed of the disk. In this way, by changing the amount of the front end of each band or the rear end of each band, or the amount of the front end and the rear end of each band according to the rotation speed of the disk, it is possible to achieve Can increase the amount of the front end of each band, the rear end of each band, or the front end and the rear end of each band, which decreases the transfer rate when playing across bands. Can be suppressed.

Also in the ninth embodiment, the flow executed by the drive controller 8 is the same as that shown in FIG. 6 described in the seventh embodiment. Further, the distribution information of the storage means (memory 9) corresponding to the type of the storage medium or the rotation speed is stored in advance inside the drive controller 8 as in the seventh embodiment.

[0087]

Tenth Embodiment Next, a tenth embodiment will be described. The tenth embodiment corresponds to the invention of claim 12, but is also related to the inventions of claims 1 to 11.

In the disk device described in the first to ninth embodiments, in the case of a device capable of using a plurality of kinds of disks, the number of buffer tracks between bands, the recording density of each band, There are cases in which the rotation speed and the like differ. For example, the above-mentioned fourth embodiment (claim 6)
The invention) and the ninth embodiment (the invention of claim 11) have a problem that the difference in these conditions greatly decreases the transfer rate when crossing the band.

In the tenth embodiment, the amount of the front end of each band or the front end of each band or the amount of the front end and the rear end of each band to be stored in advance can be set according to the type of the disc. In addition, it is characterized in that the transfer rate is prevented from lowering when reproducing over bands. The configuration of the drive controller 8 and the flow executed by the drive controller 8 are the same as those in FIG. 6 described in the ninth embodiment.

[0090]

According to the disk device of the first aspect of the present invention, the information stored in advance is used instead of the reproduction information for the tip of the band to be reproduced later. Therefore, since it is not necessary to reproduce the information of that portion, the processing time can be shortened.

In the disk device of the second aspect, information stored in advance for the rear end of the band to be reproduced first is used instead of the reproduction information. Therefore, since it is not necessary to reproduce the information in that portion, the processing time can be shortened as in the disk device according to the first aspect.

In the disk device of the third aspect, information stored in advance is used instead of the reproduction information for the rear end of the band to be reproduced first and the front end of the band to be reproduced later. Therefore, since it is not necessary to reproduce that portion, the processing time can be shortened as in the disk device according to the first or second aspect.

In the disk device of claim 4, the storage means for each function such as prefetch, LRU, write cache, etc. is provided at the rear end of the band to be reproduced first in the disk device of claims 1 to 3 or / Also, when the information on the tip of the band to be reproduced later is shared with the storage means for storing it in advance, the capacity of the storage means is distributed to each function at an arbitrary ratio. Therefore, it is possible to distribute the capacity of the storage means according to the importance of each function, and it is possible to effectively derive the processing speed of the reproduction or recording operation according to the usage of the device.

In the disk device according to the fifth aspect, by obtaining information on the frequency of use of each function corresponding to the usage pattern of the device, it is possible to set the optimum allocation of storage capacity for the usage pattern. Therefore, even if the user does not set the capacity allocation of the storage means by obtaining information on the frequency of use of each function, the capacity allocation of the storage means most suitable for the usage method of the disk device can be achieved by the function of the device side. It can be performed.

In the disk device according to the sixth aspect, the amount of the front end portion of the band, the rear end portion of the band, or the front end portion and the rear end portion of the band to be stored in advance is increased as the boundary between the bands having higher recording density is increased. can do. Therefore, it is possible to prevent a large decrease in the transfer rate at the boundary between the bands with higher recording density.

In the disk device according to the seventh aspect, the capacity distribution of the storage means can be appropriately set by using the information of the counting result stored in advance in the non-volatile memory even at the time of starting. According to the disk device of claim 8, by properly using the disk according to the usage method, even if the disk is used by different usage methods, the information of the counting result recorded on the disk is used to appropriately allocate the capacity of the storage means. Can be set.

According to a ninth aspect of the present invention, when the disc is inserted or when the power is turned on while the disc is inserted, the rear end of the band to be reproduced first and / or the front end of the band to be reproduced later is previously recorded on the disc. The stored information is reproduced and stored in the storage means of the disk device. Therefore, after that, when these pieces of information stored in the storage means are needed, the information in the storage means can be used instead, and it is not necessary to reproduce that portion. The processing time can be shortened as in the disk device according to claim 1 or claim 2.

According to the disk device of claim 10, claim 9 is used.
In the disc device, when the recording operation is performed on the information stored in the disc with respect to the rear end of the band to be reproduced first and / or the front end of the band to be reproduced later, it is stored in advance in the storage means. I try to update the information. Therefore, the content of the information stored in the storage means and the content of the information stored in the disc can be always matched.

According to the disk device of claim 11, claim 1
Therefore, in the disk device according to the tenth aspect, the amount of the rear end portion of the band to be reproduced first and / or the front end portion of the band to be reproduced later is changed in accordance with the rotation speed of the disk. Therefore, in the case of a disc having a high rotation speed, the amount of the leading end and / or the trailing end of these bands can be increased, and it is possible to reduce the decrease in the transfer rate when playing across the bands. .

According to the disk device of claim 12, claim 1
According to the eleventh aspect of the present invention, the amount of the rear end portion of the band to be reproduced first and / or the front end portion of the band to be reproduced later is changed according to the type of the disc. Therefore, the amount of the leading end and / or the trailing end of these bands can be increased according to the type of disc (corresponding to the usage method), and the decrease in transfer rate when playing across bands can be reduced. It becomes possible to do.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a main part configuration of a disk device of the present invention.

FIG. 2 is a diagram showing an example of a layout of a data area of a ZCAV storage medium.

FIG. 3 is a diagram conceptually showing a layout of a boundary between two bands in the disc device of the present invention.

FIG. 4 is a flowchart showing a main processing flow at the time of reproduction in the disc device of the present invention.

FIG. 5 is a diagram showing the distribution status inside the memory in the second embodiment of the disk device of the present invention.

FIG. 6 is a flowchart showing the main processing flow when the power is turned on for the disk device of the present invention.

FIG. 7 is a flowchart showing a main processing flow when recording on a storage medium in the disk device of the present invention.

[Explanation of symbols]

 1 Storage Medium 2 Spindle Motor 3 Rotation Control System 4 Pickup 5 Laser Drive Circuit 6 Signal Detection Section 7 Actuator Control System 8 Drive Controller 9 Memory 10 Nonvolatile Memory 11 External Interface Section 12 Switch Section

Claims (12)

[Claims] 1. A pickup, which divides a recording medium into a plurality of bands each including a plurality of tracks, records and reproduces information at a constant recording within each band and different recording and reproduction frequencies in different bands, and a purpose of the pickup. In a disk device having a means for moving to a track, the storage means for storing in advance the information written in the front end of each band, and the case where the pickup reproduces across the boundary between the bands. Is not provided with the reproduction of the leading end of the band to be reproduced later, and is instead provided with control means for controlling so that the information previously stored in the storage means is reproduced instead of the reproduction information. A disk device characterized by the above. 2. A pickup which divides a recording medium into a plurality of bands each including a plurality of tracks, records and reproduces information at a constant recording within each band and at different recording and reproducing frequencies in different bands, and a purpose of the pickup. In a disk device having a means for moving to a track, a storage means for pre-storing information written at the rear end of each band, and a case where the pickup reproduces across a band-to-band boundary Is a control means for controlling so that the information stored in advance in the storage means is reproduced instead of the reproduction information without reproducing the rear end portion of the band which is reproduced first. A disk device characterized by being provided. 3. A pickup which divides a recording medium into a plurality of bands each including a plurality of tracks, records and reproduces information at a constant recording within each band and different recording and reproduction frequencies in different bands, and a purpose of the pickup. In a disk device having a means for moving to a track, the storage means for pre-storing the information written at the leading end and the trailing end of each band, and the pickup playing across the boundary between the bands. In this case, the rear end of the band to be reproduced first and the front end of the band to be reproduced later are not reproduced. Instead, the information stored in advance in the storage means is reproduced. Control means for controlling to reproduce instead of information,
A disk device comprising: 4. The disk device according to any one of claims 1 to 3, wherein functions such as prefetch, LRU, and write cache, and a second storage means for the functions serve as a front end portion and / or a rear end portion of the band. A function of sharing a storage unit that stores information written in a unit in advance, and a distribution unit that distributes the capacity of the shared storage unit to each function such as the prefetch at an arbitrary ratio. A disk device characterized by that. 5. The disk device according to claim 4, further comprising: counting means for counting the number of executions of each of the reproduction operation across the band boundary, the reproduction operation not across the band boundary, and the recording operation. A distribution storage capacity calculating means for calculating a storage capacity of the storage means to be distributed to each of the functions, the front end portion of the band, and the rear end portion of the band from the counting result by the counting means. Characteristic disk device. 6. The disk device according to any one of claims 1 to 5, wherein a function such as prefetch, LRU, and write cache, and a second storage means for the function serves as a front end portion and / or a rear end portion of the band. A function of sharing a storage unit that stores information written in a unit in advance, and a distribution unit that distributes the capacity of the shared storage unit to each function such as the prefetch at an arbitrary ratio. A disk device characterized by that. 7. The disk device according to claim 5, further comprising: a non-volatile memory as a storage means for storing the counting result of the counting means; and an arithmetic means for adding the counting result to the content of the non-volatile memory. A disk device characterized by that. 8. The disk device according to claim 5, further comprising: recording means for recording the counting result by the counting means on the disk; and computing means for adding the counting result to the contents on the disk. Disk device characterized by. 9. The disk device according to any one of claims 1 to 8, wherein when the disk is inserted, or when the power is turned on while the disk is inserted, the front end of each band, the rear end of each band, or each band. A disk device comprising a reproducing means for reproducing the front end portion and the rear end portion of a band, and a recording means for recording the reproduced information in the storage means. 10. The disk device according to claim 9, wherein new information is added to the front end of each band, the rear end of each band, or the front end and the rear end of each band in which information is stored in advance. When recording is performed, an information updating means for updating the information of the front end of each band, the rear end of each band, or the front end and the rear end of each band, which has already been stored in the storage means, is recorded. A disk device characterized by being provided. 11. The disk device according to any one of claims 1 to 10, wherein the front end portion of each band, the rear end portion of each band, or the front end portion and the rear end portion of each band in which information is stored in advance is stored. A disk device, characterized in that it is provided with a means for changing the rotation speed according to the rotation speed of the disk. 12. The disk device according to any one of claims 1 to 11, wherein the front end portion of each band, the rear end portion of each band, or the front end portion and the rear end portion of each band in which information is stored in advance is stored. A disk device, characterized in that it is provided with means for changing the above according to the type of disk.