JPH04186562A - Information recording and replay apparatus - Google Patents

Abstract

PURPOSE:To replay information extended over a plurality of zones at high speed by a method wherein, at an MCAV system, the information in the boundary part of zones where a recording and replay frequency is changed is stored and, when the readout position of the information reaches the part, the stored information is read out. CONSTITUTION:At a recording operation, a recording and replay frequency in the position of a magnetic disk is set in a disk read/write part. When a sector being recorded reaches the boundary of a zone, a frequency for a next zone is set on the disk. A data having the prescribed number of sectors is stored in a buffer RAM 37. When, during a replay operation, an MPU 32 judges that a sector being read out exists at the boundary of a zone, a next recording and replay frequency is set on the disk; the data is transferred to a host computer 22 from the RAM 37. At this time, a data changeover signal is sent to the disk and the data in the buffer 37 is changed over to its transfer operation. Thereby, the data extended over the zones can be replayed at high speed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an information recording/reproducing device, and in particular, an information recording/reproducing device divided in the radial direction into a plurality of zones (hereinafter referred to as MCAV).
The present invention relates to an information recording/reproducing device using a storage medium.

[Conventional technology]

Conventionally, as one of the representative methods for recording and reproducing information from a recording medium such as a disk, CAV (Constant
Angular Velocity) method and changes the rotational speed of the disk to keep the linear velocity constant. C.L.
V (Constant Linear Velocity)
ty) method. Since the CAV method records and plays at a constant angular velocity,
The recording density at the outer circumference of the disk was lower than that at the inner circumference, and it was inferior to the CLV method in terms of efficient use of recording capacity. However, in the case of the CLV method, although the recording density can be kept high, the sectors are not arranged radially, and the disk rotation speed varies depending on the recording/playback position, so the disk rotation speed when accessing data is very high. This has the disadvantage that data cannot be recorded or reproduced until the specified value is reached, resulting in a long access time. Therefore, MCA, which has both the easy access of the CAV method and the superior recording density of the CLV method, was developed.
The V method, ie, a method in which the disk is divided radially into a plurality of zones and recording and reproduction are performed by increasing the recording and reproduction frequency toward the outer circumference, has come into use.

[Problem to be solved by the invention] However, in the conventional example described above, especially in the information recording and reproducing apparatus using the MCAV method, when moving from one zone to another zone where the recording/reproducing frequency changes, the predetermined recording/reproducing frequency is reached near the boundary of the zone. Recording/playback operations cannot be performed until For this reason, when inputting and outputting information across zones on a MCAV format disc, it is not possible to perform continuous recording and reproducing operations using the same recording and reproducing frequency, and when the zone changes. However, data cannot be accessed until the recording/reproducing frequency that has changed accordingly becomes stable, resulting in a long data input/output time. The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide an information recording/reproducing apparatus that can reproduce information spanning multiple zones at high speed. [Means to solve the problem]

In order to achieve the above object, the information recording/reproducing apparatus of the present invention has the following configuration. That is, in an information recording and reproducing apparatus that employs the MCAV method of reproducing and recording, in which a storage medium is divided into a plurality of areas and the reproduction and recording frequencies are changed according to the plurality of areas, the information recording and reproducing apparatus includes the storage medium and the M
a first storage means for storing information according to the CAV method; a second storage means for storing a part of the information and capable of inputting and outputting information at a higher speed than the first storage means; When information is read from the first storage means and the read position of the information on the storage medium reaches the boundary of the area, the information is read from the first storage means to the second storage means. The information recording and reproducing apparatus is provided with a control means for controlling the switching so that after reading out a predetermined amount of information, reading is continued from the first storage means again.

[Effect]

With the above configuration, the present invention stores information on the boundary of the area where the recording and reproduction frequency of the first storage means having a recording medium employing the MCAV system changes in the second storage means, so that the first storage means When reproducing information across areas with different reproduction frequencies from the means, when the information reading position reaches the boundary between the areas, the information reading is switched from the first storage means to the second storage means and a predetermined amount of information is reproduced. , and then operates to read information from the first storage means again.

【Example】

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of an information recording/reproducing apparatus which is a typical embodiment of the present invention. In FIG. 1, an information recording/reproducing device 21 uses a magneto-optical disk as a recording medium, and a host computer 22 (hereinafter referred to as
A recording/playback command (hereinafter referred to as READ) from a host)
A host I/F control unit 31 that sends and receives (referred to as -WRI TE commands) and data, an MPU 32 that controls the entire operation of this information recording and reproducing device, a ROM 33 that stores programs to be executed by the MPU 32, and a work memory for the MPtJ 32. A RAM 34, an ECC circuit 35 having a modulation or demodulation function and a verify check function for adding or deleting an error correction code (hereinafter referred to as ECC) to data, and an ECC'-- which is a work area of the ECC circuit 35.
To control the RAM 36, a read/write buffer 37 (hereinafter referred to as buffer RAM) having a capacity of 64 KB for storing recording/reproducing data, and a disk R/W unit 39 for recording or reproducing data on the magneto-optical disk. It has a disk control section 38 of. In this embodiment, the recording/reproducing area of the magneto-optical disk is divided in the radial direction to form a plurality of annular zones, and the recording/reproducing frequency is increased from the inner zone to the outer zone. Adopts the MCAV method for recording and playing back speeches. The recording/playback operation using this MCAV method is as follows:
The MPU 32 identifies which zone the head will move to based on the reproduction signal from the disk R/W section 39, and sends a predetermined recording/reproduction frequency control signal to the disk R/W section 39 according to the identification result. This is done by supplying. In addition, the buffer RAM 37 is used to buffer the difference between the transfer speed of recording/reproducing data to the host 22 and the recording/reproducing speed of the magneto-optical disk in the disk R/W section 39, and to buffer the difference in the transfer speed of recording/reproducing data to the host 22 and the recording/reproducing speed of the magneto-optical disk in the disk R/W section 39, and to modulate/demodulate data in the ECC circuit 35. It is provided for temporary storage of data for processing. FIG. 2 is a diagram showing the zone structure of the access area of the magneto-optical disk employed in the information recording/reproducing apparatus of this embodiment. In the second section, the access area of the magneto-optical disk is divided into six zones 20-25 from the inner circumference to the outer circumference. The number of sectors per track in each zone 20 to z5 is configured to increase in the outer radial direction, and the number of sectors is 11 in the innermost zone ZO, and increases one by one toward the outer periphery. In addition, there are 16 pieces in the outermost zone z5. In Figure 3, information is recorded across two zones.
FIG. 6 is a diagram showing switching timing of recording/reproducing frequencies when performing continuous reproduction. In Figure 3, "' I A n-3+ A n-3, A
n-1+ A n represents each sector of zone A, B , , B
2. B m, B , . . . represent each sector of zone B. Further, A7 indicates the last sector of zone A, and B+ indicates the first sector of zone B. In this embodiment, it is assumed that data is continuously reproduced from zone A to zone B. The timing at which the recording/playback frequency is switched from zone A to zone B is indicated by T1 and T2, furthermore, T1 is the time at which access to disk data is switched to access to buffer data, and T3 is the reverse buffer data. Indicates the time when access switches from access to disk data to access to disk data. Here, disk data refers to data that accesses the disk RZW unit 39, and buffer data refers to data that accesses the disk RZW section 39.
7 refers to the data accessed. Now, assuming that 2 to 3 sectors pass through the disk rotation during the recording/reproduction frequency switching time (Tl to T2>), the MPU 32 detects the ID of sector A at the time (T
At the same time as supplying the frequency switching signal to the disk R/W unit 39 in step 1), the disk data is read out at the beginning of the next sector (in this case, the beginning of sector B1) from B1 to B3, which have been previously read into the buffer RAM 37. A data switching enable signal is supplied to switch data transfer from the buffer data to data transfer from the buffer data. This signal allows data transfer switching from the beginning of sector B of zone B. Through the above processing, data up to the An sector of zone A is transferred to the host 22 as playback data from the disk, and zone B
In the area where the recording/reproducing frequency is unstable up to sector B, ~B, the reproduced data from the buffer RAM 37 is transferred to the host 22. Further, after this, when a stable recording/reproducing frequency usable in zone B is reached at T2, that is, from sector B4 of zone B, disc data can be reproduced again. That is, at T3, the process of switching the transfer data to disk data is performed again. That is, in order to transfer data from the beginning of sector B4 of zone B to the host 22 from playback data from the buffer RAM 37 to playback data from the disk, the MPU 32 uses the disk R/W unit 3.
A data switching permission signal is supplied to 9. This signal causes data transfer to be switched to sector B of zone B.
Permission is granted from the beginning of 4. Next, the data diary processing procedure and the data reproduction processing procedure in this embodiment will be explained with reference to the flowcharts shown in FIGS. 4 and 5, respectively. First, the data recording processing procedure will be described. First, in step Sl, when a WRITE command is issued from the host 22, the recording/reproducing frequency of the magneto-optical disk position where the recording operation is to be performed is set in the disk R/W section 39. Next, in step S2, a seek operation is performed to move the optical head to the track where this recording position exists. Subsequently, in step S3, it is determined whether the actual recording start address has been reached by the seek operation. because,
Normal seek operation is performed on the track (n) containing the recording start sector.
Since the optical head is moved to the immediately preceding track (n-1), after the seek operation is completed, there is a rotation wait until the specified sector corresponding to the recording position is searched, so the optical head is moved to the recording start sector immediately after the seek operation is completed. This is because it is not set. Here, if it is determined that the optical head has not reached the start sector, this step is repeated, and if it is determined that the start address has been reached, the process proceeds to step S4. Step S4 is execution of a recording mode operation, and in this step, three operations are executed on the same area in the order of (1) erasure operation, (2) recording operation, and (3) verify operation. Each time one of these operations is completed, the process proceeds to step S5.
Proceed to. In step S5, it is determined whether the sector in which the recording operation is currently being performed is at the zone boundary (last sector). Here, if it is determined that it is not a zone boundary, the process proceeds to step S8, and if it is determined that it is a zone boundary, the process proceeds to step S6. In step S6, the recording/reproducing frequency of the next zone is set in the disc R/W unit 39, and furthermore, only during recording operation, data of a predetermined number of sectors from the beginning of the zone to be switched (in this embodiment, sectors B1 to B, three sectors worth of data) are stored in a predetermined area of the buffer RAM 37. Subsequently, in step S7, it is determined whether the set recording/reproducing frequency has become stable. Here, if it is determined that it is not stable, this step is repeated, and if it is determined that it is stable, the process returns to step S2 (however, the position to be moved in step S2 is determined by the g diary/playback frequency in step S7). (the first sector of the configured zone). Next, step S8 is a single mode (recording mode operation (1)).
It is determined whether the erase operation, (2) recording operation, or (3) verify operation has been completed. Here, if it is determined that the single mode has not ended, the process returns to step S4 to repeat the same mode, and if it is determined that the single mode has ended, the process advances to step S9. Step S9 is a recording mode operation ((1) erasing operation, (2)
) Recording operation, (3) Verifying operation) Completion of all operations is determined. Here, if it is determined that the recording mode operation has not ended, the process returns to step S2. Then, if only the erasing operation is completed, the process moves to the recording operation, and if the recording operation is also completed, the process moves to the verify operation and executes the next operation in the same area. On the other hand, if it is determined that all the operations in the distribution mode have been completed, all processing in the recording mode is ended. Next, the data reproduction processing procedure will be explained. This data reproduction process is based on the premise that when the apparatus of this embodiment is started up, a predetermined number of sectors of data from the beginning of each zone of the magneto-optical disk are read out and stored as buffer data in a predetermined area of the buffer RAM 37 in preparation for transfer to the host 22. shall be. First, in step Sll, the recording/reproducing frequency at the position where the data reproducing operation is to be performed is set in the disc R/W section 39. Next, in step S12, a seek operation is performed to move the optical head to the track where this reproduction position exists. Subsequently, in step S13, after the end of the seek operation, it is determined whether the optical head has reached the data reproduction start address. This is because the normal seek operation moves to the track (n-1) immediately before the track (n) containing the playback start sector.
After the seek operation is completed, there is a rotation wait until the optical head is moved to the recording position, so the optical head is not set to the recording start sector immediately after the seek operation is completed. be. If it is determined that the start sector has not been reached, this step is repeated, and if it is determined that the start address has been reached, the process proceeds to step 31.4. In step S14, the reproduction operation is sequentially executed one sector at a time. Next, in step S15, it is determined whether the sector in which data is currently being read is a zone boundary (last sector). If it is determined that it is not a zone boundary, the process proceeds to step S21. On the other hand, if it is determined that it is a zone boundary, the process proceeds to step S16. In step S16, the recording/reproducing frequency of the next zone is set in the disc R/W section 39. Next, step S17
Now, it is checked whether there is data to be transferred to the host 22 in the buffer RAM 37. If it is determined that data exists here, the process advances to step S19. On the other hand, if it is determined that no data exists, the process proceeds to step 818, and it is determined whether the set recording/reproducing frequency has become stable. If it is determined that the zone is not stable, this step is repeated, and if it is determined that the zone is stable, the process returns to step S12 and the data reproduction operation is executed from the next zone. However, the position to be moved in step S12 at this time is the first sector of the zone in which the recording/reproducing frequency was set in step S16). However, the situations in which it is determined that there is no data in the buffer RAM 37 are limited to cases where, for example, there is no data to be read when the device is started up (if it is an unrecorded area), or when reading fails due to some failure. It is something that occurs. In such a state, data is read from the disk, but the same data is not only transferred to the host 22 but also stored in the buffer R in preparation for the next READ command.
It is also transferred to AM37. In step S19, the data switching signal is transmitted to the disk R.
/W unit 39 to switch disk data transfer to buffer data transfer. Following this, step S2
If it is 0, it is determined whether the set recording/reproducing frequency is stable. If it is determined that the stability is not stable, the process repeats this step, and during this time, the buffer RAM 37
The buffer data is transferred from the host 22 to the host 22. On the other hand, if it is determined that the situation has stabilized, the disk R/W unit 3 sends a data switching signal to switch the transfer data from the next sector from buffer data to disk data again.
Set to 9. Finally, in step S21, it is determined whether the data reproduction processing operation is finished. Here, if it is determined that the playback mode operation has not ended, the process returns to step S14 to continue the playback operation, and if it is determined that the playback mode has ended, the playback mode operation is ended. Therefore, according to this embodiment, in an information recording/reproducing apparatus that employs an MCAV type optical disc, data for the first few sectors at the boundary of each zone is stored in the buffer RAM when the apparatus is started up or when the first READ command is executed. (Thus, when operating in playback mode, it is possible to perform high-speed playback of data that spans between zones, albeit in a pseudo manner. Also, when operating in record mode, the first number at the boundary of each zone can be read and stored.) Buffer sector data to RA
By writing to M and storing it, it is possible to prepare for the next data reproduction.

【Effect of the invention】

As described above, according to the present invention, by providing a buffer that can perform data access at high speed, data reproduction operations can be performed at high speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an information recording and reproducing apparatus that is a typical embodiment of the present invention, FIG. 2 is a diagram showing the zone configuration of the recording/playing area of a disk, and FIG. FIG. 4 is a flowchart showing the data recording processing procedure, and FIG. 5 is a flowchart showing the data reproduction processing procedure. In the figure, 21... Information recording/reproducing device, 22... Host computer, 31... Host I/F III control section, 32... MPtJ, 33... ROM, 34...
・RAM, 35...ECC circuit, 36...ECC-
RAM, 37... Read/write buffer section, 38.
. . . disk control unit, 39 . . . disk R/W unit. Figure 2 V-:/A, '/-:/B Figure 3

Claims (4)

[Claims] (1) An information recording and reproducing device that employs an MCAV method of reproducing and recording, in which a storage medium is divided into a plurality of areas and the reproduction and recording frequency is changed according to the plurality of areas, the information recording and reproducing device having the storage medium and the MCAV a first storage means for storing information according to a method; a second storage means for storing a part of the information and capable of inputting and outputting information at a higher speed than the first storage means; is read from the first storage means, and when the reading position of the information on the storage medium reaches the boundary of the area, the reading of the information is switched from the first storage means to the second storage means, 1. An information recording/reproducing apparatus comprising: a control means for controlling the readout from the first storage means again after reading out the amount of information of the first storage means. (2) The information recording and reproducing apparatus according to claim 1, wherein the storage medium is a magneto-optical disk. (3) The information recording/reproducing apparatus according to claim 1, wherein the second storage means includes a semiconductor storage element. (4) The control means includes a detection means for detecting a boundary of the area on the storage medium of the first storage means, and a detection means for detecting the boundary of the area on the storage medium, and a 2. The information recording and reproducing apparatus according to claim 1, further comprising frequency control means for controlling the recording frequency to be changed.