JP2002015518A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that conventionally reproduction is interrupted in the access period extending over a plurality of bands, when reproduction is performed extending the plurality of bands in a disk device whose data zone is divided with the plurality of bands for recording data, and whose rotational speed is controlled so that the angular velocity is kept constant by a band unit. SOLUTION: When it is decided that data whose read is required are recorded, extending over another band and it is judged that the location of the data for starting read is in a prescribed region just before access to another band starts, reproduced data from the band, on which the data for starting read are recorded, are stored in a buffer memory 13. The reproduced data stored in the buffer memory 13 are outputted, after the access to another band is completed. Thereby, even when reproduced extending over a different band, the reproduced data from the different band are not interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device in which data is recorded by dividing a data zone provided on a disk by a plurality of bands, and the rotational speed of the disk is controlled at a constant angular speed for each band.

[0002]

2. Description of the Related Art In a disk drive, data is recorded by dividing a data zone provided on the disk by a plurality of bands, and the rotational speed of the disk is controlled at a constant angular speed in band units.
(Zone Constant Angular Velocity) method exists.

In a disk drive employing the ZCAV system, the polarity of a magnetic field applied by a magnetic head is changed according to data to be recorded while irradiating a laser beam emitted from an optical head to record data on a magneto-optical disk. There is known a magneto-optical disk drive of a magnetic field modulation recording system for performing the following.

[0004]

By the way, in a disk device adopting the ZCAV system, data required to be read spans two bands, and when performing reproduction across the boundary between the two bands, the previous data is read. After the data is read to the end of the band, the start of the next band is accessed, and the data read is resumed from the start.

[0005] Therefore, when reproduction is performed across the boundary between two bands, track jump of the read position by the head and rotation speed adjustment of the disk are performed at the boundary portion, and the end of the band is reached. During the period from the end of data reading to the start of data reading of the next band, data reading from the disc is discontinuous, and a situation occurs in which reproduction is interrupted during an access period across bands.

Further, depending on the arrangement of the data recorded on the disc, the data required to be read may straddle another band other than the adjacent band. Is performed, and a situation occurs in which reproduction is interrupted during this access period.

[0007] If the reproduction is interrupted, moving images and audio are interrupted in the case of data requiring continuity such as video data and audio data, which is a problem.

[0008] Further, during recording on the disk, data required to be written to the disk may span a plurality of different bands. In such a case, access across the bands is performed. Since the writing to the disk is interrupted, the amount of data stored in the buffer memory for temporarily storing the data requested to be written transmitted from the host device such as a personal computer increases during the access period, and the writing is requested. There is a concern that a memory area in the buffer memory for storing data may overflow.

Japanese Patent Laid-Open Publication No. H8-63877 discloses a disk drive which shortens the processing time at the boundary between bands. In this disk device, the data recorded at the end of the band is stored in the buffer memory in advance, and when the reproduction is performed across the boundary between the bands, the reproduction of the end of the band to be reproduced first is performed. Without
The data stored in the buffer memory in advance is reproduced instead of the reproduced data. This eliminates the need to reproduce the end of the band, eliminates the need for an access operation of the pickup, and reduces the processing time at the boundary.

[0010] However, the above-mentioned Japanese Patent Application Laid-Open No. 8-6387.
In the disk device disclosed in Japanese Patent Laid-Open Publication No. 7-107, it is necessary to store data recorded at the end of the band in a buffer memory in advance, which requires preparation before reproduction and a buffer memory used. There is a problem that the storage capacity increases.

Further, in the disk device disclosed in the above-mentioned publication, only the last end and the beginning end of the band are supported, and data reading or writing from the center of the band to another band is not supported. Also, it is intended only for the case of straddling an adjacent band, and does not correspond to the case of straddling a distant band.

[0012]

According to the first aspect of the present invention, it is determined that the data required to be read is recorded on the disk over another band, and the position of the read start data is shifted to another band. When it is determined that the read start data is within the predetermined area immediately before the start of access, data reproduced from the band in which the read start data is recorded is stored in the buffer memory, and the data stored in the buffer memory is stored in another band. Output after access is completed. In this way, even when the data is reproduced across different bands, the reproduction data reproduced from the crossed bands is made continuous.

According to a second aspect of the present invention, the capacity occupied by each area of a write memory area used at the time of recording in the buffer memory and a read memory area used at the time of reproduction is variably controlled. It is determined whether or not the data to be recorded is recorded on the disk across another band, and when accessing another band, it is detected that the reading position of the disk has reached a predetermined area immediately before the access, When it is detected that the read position of the disk has reached a predetermined area immediately before access, the read memory area of the buffer memory is expanded. As a result, the amount of reproduced data that can be stored in the buffer memory is increased until the next band access is started.

According to a third aspect of the present invention, the capacity occupied by each area of a write memory area used for recording in a buffer memory and a read memory area used for reproduction is variably controlled, and a request for writing is controlled. It is determined whether or not the data to be recorded is recorded on the disk over another band, and when accessing another band, it is detected that the writing position of the disk has reached a predetermined area immediately before the access, When it is detected that the write position of the disk has reached a predetermined area immediately before access, the write memory area of the buffer memory is expanded. This prevents the data of the write request cached in the buffer memory from overflowing until the write start point of the next band is accessed.

[0015]

FIG. 1 is a circuit block diagram showing an embodiment of an optical disk recording / reproducing apparatus which performs disk recording by optical modulation as an example of a disk apparatus according to the present invention.

In this optical disk recording / reproducing apparatus, a disk corresponding to the ZCAV system is used,
The AV system is adopted.

In FIG. 1, reference numeral 1 denotes an optical head which emits a laser beam for tracing a signal track of a disk and writes and reads recording data on the disk.

Reference numeral 2 denotes an R for amplifying the RF signal of the received light output obtained by the optical head 1 and binarizing the RF signal.
The F-amplifier 3 feeds back various light-receiving outputs obtained by the optical head 1, focuses the laser beam emitted from the optical head 1 on the signal surface of the disk, and causes the laser beam to follow the signal track of the disk. A head servo circuit that performs tracking control and performs thread feed control for sending the optical head 1 itself in the radial direction of the disk.

Reference numeral 4 denotes a decoder which performs a demodulation process on the binary data of the RF signal output from the RF amplifier 2 in synchronization with the bit clock. The decoder 4 receives the input RF signal.
It demodulates from the binary data of the signal according to the modulation code according to the disc standard, and demodulates various data according to the data structure.

Reference numeral 5 denotes an upper device such as a personal computer having an interface 7 for controlling data transfer via the connection terminal 6, 8 an interface for controlling data transfer with the upper device 5, and 9, an interface 8 via the interface 8. The encoder encodes input data into a data structure to be recorded on a disc and modulates the data into data corresponding to a modulation code of a disc standard.

Reference numeral 10 modulates the output intensity of the laser light generated from the optical head 1 based on the recording data output from the encoder 9, generates a write pulse corresponding to the recording data, and drives the laser light source of the optical head 1. Laser drive circuit.

Reference numeral 11 denotes an RF amplifier 2 by a push-pull method.
Demodulates a 22.05 kHz wobble signal included in the pre-groove of the disk from the push-pull signal generated by the above, generates a clock necessary for controlling the rotation of the disk, and generates an ATIP from the wobble signal.
ATIP that demodulates (Absolute Time In Pre-groove)
This is a wobble decoder including a demodulation circuit 12.

Reference numeral 13 denotes a buffer RAM which is shared during recording and reproduction of the disk. As shown in FIG. 2, the buffer RAM 13 has a write memory area R used during recording and a read memory area L used during reproduction. And

The write memory area R is used as a write cache for temporarily storing input data requested to be recorded and input via the interface 8, and is encoded by the encoder 9 into recording data to be recorded on the disk. Used when doing.

On the other hand, the read memory area L is used as a read cache for temporarily storing reproduced data decoded and reproduced by the decoder 4 and used for decoding data read from a disk by the decoder 4. used.

Reference numeral 14 denotes a system control circuit for performing system control relating to recording and reproduction of a disk. The system control circuit 14 controls writing and reading of data to and from the buffer
13, a buffer control means 15 for variably controlling the capacity occupied by each area, a command interpretation means 16 for interpreting a command from the host device 5, and a zone for each zone of the disk and a data zone for recording user data therein. Zone management means 17 for managing each band according to a management table;
The latest ATIP demodulated by the ATIP demodulation circuit 12
An address memory 1 for storing an address and the latest subcode address separated and demodulated by a decoder 4
8 and the remaining frames in the same band at the reading position or the writing position of the disk by the optical head 1 are calculated, and it is detected that the remaining frames are equal to or smaller than a predetermined number. It comprises a remaining frame calculating means 19 for detecting, and an access control means 20 for performing control for accessing a target track by skipping a reading position or a writing position of the disk by the optical head 1.

Next, the reproducing operation of the optical disk recording / reproducing apparatus thus configured will be described.

When a command for a disk read request is input from the host device 5 via the interface 8, the command is interpreted by the command interpreting means 16, and each circuit is controlled so that a reproducing operation is performed in accordance with the command. Is done.

When reading from the disk, a reading position is set by referring to each information of the file system recorded on the disk, and the access control means 2 accesses the address corresponding to the reading position.
0, an access operation is performed, and the read position of the disk is accessed.

The accessed digital recording signal is read by the optical head 1, amplified by the RF amplifier 2, and binarized digital data is decoded by the decoder 4 and reproduced.

In this case, the digital data decoded by the decoder 4 has a data transfer rate which changes according to the reading speed at which a digital recording signal is read from a disk driven by the ZCAV system.
Performs signal processing including error correction using a bit clock reproduced from digital data as an operation clock to reproduce data.

The reproduced data output from the decoder 4 is temporarily stored in the buffer RAM 13 and then transferred to the host device 5 via the interface 8.

When the recording data is read by the optical head 1, address data to be separated from the recording data and decoded by the decoder 4 is stored in the address memory 18 corresponding to the latest frame of the recording data to be read. It is memorized. Therefore, the address data stored in the address memory 18 corresponds to the frame read by the optical head 1.

Using the address data stored in the address memory 18, the remaining frame calculating means 19
Referring to the management table by the zone management means 17, the remaining frames of the same band of the recording data being read are calculated.

If the zone management unit 17 determines that the data required to be reproduced spans another band on the disk, the remaining frame calculation unit 19 determines the number of remaining frames of the same band by a predetermined number. (Set in consideration of the capacity of the read memory area L in the case where the read memory area L in the buffer RAM 13 is set to the maximum). When it is determined that the data has arrived, the buffer control means 15
13, the write memory area R and the read memory area L
In this case, the capacity occupied by each area is variably controlled so that the boundary b is displaced. In this case, the write memory area R is secured at a minimum and the read memory area L is set to the maximum.

When the read memory area L in the buffer RAM 13 is set to the maximum, the buffer RAM 13 for storing the reproduction data decoded by the decoder 4
, The data amount increases.

For this reason, in the case where an access operation occurs when data to be read crosses another band, the reproduced data that can be stored in the buffer RAM 13 until the start of access to the next band. Is increased.

Here, the reproduced data stored in the buffer RAM 13 is read out immediately after the access to another band is completed by the buffer control means 15.

When it is determined that the data amount of the reproduction data read and reproduced in the same band is the data amount that can be stored in the buffer RAM 13 and is within a predetermined area immediately before access to another band, The buffer control means 15 causes the buffer control unit 15 to wait until reading of the reproduction data stored in the buffer RAM 13 is completed until the access of the other band is completed. The reproduced data read from another band can be sent to the host device 5 continuously, the continuity of the reproduction is ensured, and video data, audio data, etc. In this case, it is possible to prevent the video and audio from being interrupted.

In this case, since the data to be read crosses another band, the read memory area of the buffer RAM 13 is expanded, and the amount of reproduced data that can be stored in the buffer RAM 13 is increased. The predetermined area immediately before the access to another band determined by the means 17 is expanded.

On the other hand, when it is determined that the data amount of the reproduction data read and reproduced in the same band is larger than the data amount that can be stored in the buffer RAM 13, the buffer control unit 15 starts before the access to another band is started. In this case, the transfer rate of reading from the disk is set higher than the transfer rate of reading the play data stored in the buffer RAM 13.
The amount of reproduction data stored in the storage device is increased within the storage capacity that can be stored.

When the data reading in the same band is completed and an access operation to another band is performed, the buffer RAM 1 is not used until the access is completed.
3 is read out and sent to the higher-level device 5 to ensure continuity of reproduction, and it is possible to prevent interruption of moving images and audio in the case of data requiring continuity such as video data and audio data. To prevent.

In this case, since the data to be read crosses another band, the read memory area R of the buffer RAM 13 is expanded, and the amount of reproduced data that can be stored in the buffer RAM 13 is increased. Thus, the reproduction data to be transmitted to the host device 5 during the period in which data cannot be read from the disk can be sufficiently secured in the buffer RAM 13.

Therefore, reproduction data to be transmitted to the host device 5 can be sufficiently secured in the buffer RAM 13 during a period in which data cannot be read from the disk due to access, and reproduction data stored in the buffer RAM 13 until the next band is accessed. Data can be prevented from becoming empty, and reproduction data can be prevented from being interrupted.

Therefore, the reproduction data is continuously transmitted to the host device 5, the continuity of the reproduction is ensured, and in the case of data requiring continuity such as video data and audio data, the moving image and the audio are interrupted. Is prevented.

Next, the recording operation will be described.

When a disk write request command is input from the host device 5 through the interface 8, the command is interpreted by the command interpreting means 16, and each circuit is controlled so that a recording operation is performed in accordance with the command. Is done.

In the case of disk recording, file data of a write request file sent from the host device 5 is stored in a buffer RA.
The data is written to M13, and the data is recorded by an encoder 9 with an error detection code, an error correction code and an address code added thereto, subjected to a modulation process according to the disc standard, added with a synchronization signal, and recorded on the disc. Is encoded to

On the other hand, when writing to a disc,
The write position of the disc is searched.

The write position of the disk is set in accordance with the management table managed by the zone management means 17 by referring to each information of the file system recorded on the disk so far, and the write position of the disk is set. Once set, an access operation is performed by the access control means 20 to access an address corresponding to the write position, and the write position on the disk is accessed.

When the write position of the disk is accessed, the recording data generated by the encoder 9 is sequentially supplied to the laser drive circuit 10 in sector units, and the recording data is written to the disk via the optical head 1.

If the zone management means 17 determines that the data to be written is recorded on the disk over another band, the remaining frame calculation means 19 presets the remaining frames of the same band. A predetermined number (the write memory area R when the write memory area R in the buffer RAM 13 is set to the maximum)
When the zone management unit 17 determines that a predetermined area immediately before access to another band has been reached, the buffer control unit 15 sets the write memory area R in the buffer RAM 13. The capacity occupied by each area is variably controlled in order to displace the boundary b between the read memory area L and the read memory area L. In this case, the read memory area L is secured at a minimum and the write memory area R is set to the maximum.

When the write memory area R in the buffer RAM 13 is set to the maximum, the amount of data in the buffer RAM 13 for storing received data which is requested by the host device 5 to be written to the disk and received is increased.

Therefore, in the case where an access operation occurs due to the data required to be written straddling another band, the reception data which can be stored in the buffer RAM 13 until the start of the access of the next band. Is increased.

Therefore, when the data writing in the same band is completed and an access operation to another band is performed, the host device 5 is not connected until the access is completed.
Is received in the buffer RAM 13, the storage capacity for storing the received data can be sufficiently secured in the buffer RAM 13, and the buffer RAM 13 is prevented from overflowing during the access period.

The disk device shown in FIG. 1 is an optical disk recording device that performs disk recording by optical modulation. However, the present invention is not limited to this, and the present invention applies a laser beam emitted from an optical head to a magneto-optical disk. In addition, the present invention can also be applied to a magneto-optical disk recording device that performs data recording by applying a magnetic field generated by a magnetic head. The recording head is configured to generate a recording magnetic field in accordance with the modulated recording data, and at the same time, to generate a pulsed laser beam from the optical head to perform recording on a disk. .

[0057]

As described above, according to the first aspect of the present invention, immediately after the access of another band is completed, the read data is read from another band continuously to the reproduction data of the band read so far. Since the reproduced data is output, continuity of reproduction can be ensured, and data required for continuity can be prevented from being interrupted by straddling a band.

According to the second aspect of the present invention, the data required to be read crosses another band, so that the read memory area of the buffer memory is expanded, and the data amount of the reproduced data that can be stored in the buffer memory. Therefore, reproduced data to be output during a period in which data cannot be read from the disk due to access can be sufficiently secured in the buffer memory.

According to the third aspect of the present invention, in a case where an access operation occurs when data requested to be written crosses another band, the data is received during a period until the access to the other band is completed. A sufficient storage capacity for storing the received data can be ensured in the buffer memory, and it is possible to prevent the buffer memory from overflowing during the access period.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing one embodiment of an optical disc recording / reproducing apparatus that performs disc recording by optical modulation as an example of a disc apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing a write memory area R and a read memory area L in a buffer RAM 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical head 4 Decoder 5 Host device 9 Encoder 13 Buffer RAM 14 System control circuit 15 Buffer control means 17 Zone management means 19 Remaining frame calculation means 20 Access control means

Claims (4)

[Claims] 1. A disk device in which data is recorded by dividing a data zone provided on a disk by a plurality of bands, and the rotational speed of the disk is controlled at a constant angular velocity in band units, and a read is required. Is determined to be recorded on the disc over another band, and the position of the read start data is determined to be within a predetermined area immediately before the start of access to another band, the read start data is A disk device wherein data reproduced from a recorded band is stored in a buffer memory, and the data stored in the buffer memory is output after access to another band is completed. 2. Data is recorded by dividing a data zone provided on a disk by a plurality of bands, the rotation speed of the disk is controlled to a constant angular velocity in band units, and the same buffer memory is used during recording and reproduction. Is a shared disk device, wherein the capacity occupied by each area of a write memory area used for recording in the buffer memory and a read memory area used for reproduction is variably controlled, and reading is performed. Determines whether the requested data is recorded on the disk across another band, and detects that the disk reading position has reached a predetermined area immediately before the access when accessing another band. When it is detected that the read position of the disk has reached a predetermined area immediately before the access, the buffer memory of the buffer memory is detected. A disk device characterized in that a read memory area is expanded. 3. Data is recorded by dividing a data zone provided on a disk by a plurality of bands, the rotation speed of the disk is controlled to a constant angular velocity in band units, and the same buffer memory is used during recording and reproduction. Is a shared disk device, wherein the capacity occupied by each area of a write memory area used for recording in the buffer memory and a read memory area used for reproduction is variably controlled, and writing is performed. Determines whether the requested data is recorded on the disk across another band, and detects that the writing position of the disk has reached a predetermined area immediately before the access when accessing another band. When it is detected that the write position of the disk has reached a predetermined area immediately before the access, the write of the buffer memory is performed. A disk device characterized in that the memory area is expanded. 4. Calculating a remaining frame in the same band at a read position or a write position of the disk,
4. The disk drive according to claim 2, wherein the remaining frames are detected to be equal to or less than a predetermined number, and the arrival to a predetermined area immediately before accessing another band is detected.