JPH06267191A - Storage - Google Patents

Abstract

PURPOSE:To effectively transfer reproducing data by deciding whether an objective area is an area where no data exists or the area where the data are erased from the read data and prohibiting the transfer of the data. CONSTITUTION:The reading of a specified area on a disk 23 is instructed to a read aprt 22 by a CPU 17 in a magneto-optical disk driver device 14 according to a command transferring the read data from a host computer 12 to a scanner 13. Then, the read data are transferred to an interface 15. On the other hand, when no data are read, whether a read area is an erased area or the area no data exists is decided with a decision part 19 by the CPU 17. Then, when the erased area, the area is skiped, and when no erased area, the area is processed as an error, and the data transfer is prohibited. Thus, no error occurs while reading the erased area, and the regenerative data are transferred continuously and effectively. Further, the transfer of a dummy signal instead of the transfer prohibition occurs a similar state also.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device using a disk-shaped storage medium such as a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, a disk-shaped medium such as a magneto-optical disk is generally divided into a plurality of tracks (1, 2, ... L) as shown in a schematic map in FIG. Each track is divided into multiple blocks or sectors- (1,
2, ... M) are divided and used, and the blocks in one track are logical area 101 (1, 2, ... N) and alternative area 1
02 (N + 1 ... M). When recording data, data is recorded up to the final block in the logical area of a certain track.
When used for recording data, the remaining data is recorded from the first block of the logical area of the next track. Therefore, in general, when reading from a disk in which a large amount of data is recorded, the read head access becomes discontinuous for each track due to the unrecorded alternative area existing in each track.

Further, by using a device such as a magneto-optical disk drive device which is not capable of direct overwriting, data from a device such as a scanner which continuously outputs data is recorded in a storage medium. In this case, as shown in FIG. 6, a certain area is secured in the entire logical area 103 (white portion in the figure) of the disk, and the secured logical area 104 (hatched portion in the figure) is read from the scanner. Data to be read
Data is recorded. In this case, since direct overwriting cannot be performed in the magneto-optical disk drive device at the time of writing the data, normally at least 2 of erasing and writing is required.
Staged operation is required.

However, if the two-step operation of erasing and writing is performed during the recording operation, the data read from the scanner cannot be continuously processed, so that the time without using the magneto-optical disk drive is used. Then, when the data from the scanner is processed by erasing the logical area in advance, only the writing of the data is adopted.

Generally, as shown in FIG. 7, the data from the scanner does not fill the entire area of the individual reserved logical area, but the data is partially contained in the reserved individual logical area. Will exist. That is, in each of the secured logical areas, there is an area where data exists (data area, hatched area in the figure) and an area that is erased but does not exist (erased area, white area in the figure). Both) are mixed.

[Problems to be Solved by the Invention]

In the prior art, when data is read from a recording medium in which the logical area and the alternative area coexist as described above, or a recording medium in which the data area and the erase area coexist, in the reproducing circuit. A discontinuous access operation occurs, and as a result, continuous data transfer cannot be performed to the reproduction output terminal. In addition, the discontinuous access operation causes a heavy burden on the host computer that controls reading and writing between the scanner and the storage device, for example.

For example, a case of a magneto-optical disk drive device as an example of a conventional storage device will be described below with reference to FIG.

In FIG. 8, the host computer 1 controls reading / writing of the scanner-2 and the magneto-optical disk drive device 3. When the magneto-optical disk drive device 3 receives a read command from the host computer 1, the interface unit (I
/ F) 4, the CPU 6 recognizes the command and reads the data from the disk 11 through the reading unit (READ unit) 10.

At this time, if the reading section 10 is reading the data area of the disk 11, the CPU 6 performs the processing determined by the control signal in the read data, and the data transferred from the reproduction output terminal. However, when the reading section 10 reads the erased area of the disk 11, there is no control signal in the read data, so the CPU 6 recognizes it as an error and no data is produced in the reproduction output.

Therefore, when the host computer 1 reads the erased area and becomes an error as described above, the error for the first read command is an error for the erased area. Then, the read command for the next logical block is output to the disk drive device 3 again. Such error processing and recommand processing in the host computer 1 occur every time the erase area is read, and as a result, the read operation becomes discontinuous.

For example, in the case of reading data in FIG. 7, an erase area 106 is added to the end block of the data area 105 which is continuous from the head block of the logical area as shown in FIG.
, The data can be continuously read by the disk drive, and an error occurs when the read position reaches the erase area. Therefore, the data section can be read without any problem.
However, in the case where the erase area 108 is arranged such that the data area 107 is interrupted in the middle of the block of each track as shown in FIG.
An error occurs every time the data reaches the erase area 108 while the data is being read from the head block of each track 07, and it takes time for the recovery processing, and the read position is next to the data area 107. The output of the recommand from the host computer may not be in time while moving to the track head block, or even if it is in time, the host computer will be heavily burdened. Even when the erase area 110 is arranged such that the data area 109 is in the middle block range as shown in FIG. 7C, the same inconvenience as in the case of FIG. .

Therefore, the present invention provides a storage device capable of continuously transferring reproduction data at the time of reading even if the erase region is arranged in any block form in the storage region of the storage medium. To aim.

[0013]

In the present invention according to claim 1, a first area in which recording data exists and a second area in which no data exists or is erased in a plurality of storage areas. In a storage device that reproduces data from a recording medium having: a determination unit that determines whether a read target region is a second region based on a signal read from the storage medium; Means for inhibiting transfer of data to the reproduction output terminal during reading of the second area based on the result.

According to a second aspect of the present invention, a recording medium having a first area in which recording data exists and a second area in which no data exists or has been erased are stored in a plurality of storage areas. In a storage device that reproduces data, a determination unit that determines whether a read target area is a second area based on a signal read from the storage medium, and a second determination unit based on a detection result of the determination unit. Means for transferring dummy data to the reproduction output terminal during reading of the area (1).

[0015]

In the memory device according to the present invention, when the data is read, the read data is transferred to the reproduction output end in the data area, and the reading result is detected by the judging means during the reading of the erase area. Based on this, the transfer of data to the reproduction output terminal is prohibited, or another specially generated data pattern (dummy data) which is not read data is transferred to the reproduction output terminal. As a result, an error signal is not generated at the reproduction output end during reading of the erased area in any case. Therefore, error processing and recommand processing on the host computer side are not necessary, and a substantially continuous operation is possible. Data can be transferred efficiently.

[0016]

FIG. 1 shows a first embodiment of the present invention. A magneto-optical disk drive device 14 as a storage device according to this embodiment includes a host computer 12 and a scanner-13.
Connected with. The disk drive device 14 is an interface (I / F) 15 for inputting / outputting signals to / from the host computer 12 and the scanner 13 and a random access memory (R) for temporarily storing control information and the like.
AM) 16, a CPU 17 that controls the control operation, a read-only memory (ROM) 18 that stores predetermined control information and the like, and an erasure in which a read target area has no data based on a read signal. A determination unit 19 that determines an area, an erase unit (ERASE unit) 20 that performs an erase operation on the disk 23, a write unit (WRITE unit) 21 that also performs a write operation, and a read unit that also performs a read operation. It includes a (READ section) 22 and a disc rotation system (not shown).

During the reproducing operation, the host computer 1
2 is a scanner-1 in the magneto-optical disk drive device 14.
A read command of data to be transferred to 3 is given. According to the flow shown in FIG. 3, the CPU 17 which has received this command via the interface 15 in step 25,
The reading unit 22 is instructed to read the designated area of the disk 23 from the host computer 12.

The reading unit 22 reads the data from the disk 23 in step 26 according to an instruction from the CPU 17. The CPU 17 judges this data in step 27,
If it is read, this data is transferred from the output end to the scanner 13 through the interface 15 in step 28,
If not read, the determination unit 19 determines in step 29 whether or not the read target area is an erased area.

When the determination unit 19 determines that the area is not the erased area, the CPU 17 terminates the process as a read error in step 32 (step 30).
If a determination result that the area is the erased area is generated, C
The PU 17 immediately skips the reading without making an error, that is, shifts to the read / write processing of the next block (step 29) instead of the data transfer. At this time, the data is not transferred from the interface 15 to the output terminal, and the same processing is performed based on the read command of the next block from the host computer 12 to read the next block. If there is no command, the process ends (step 30).

FIG. 2 shows a second embodiment of the present invention. Compared to the first embodiment, the disk drive device 14
The difference is that a dame data generating section 24 is provided therein, and the other points are the same, so description thereof will be omitted.

During the reproducing operation, the host computer 1
2 is a scanner 13 in the magneto-optical disk drive device 14
Outputs a data read command for transfer to. The CP which has received this command via the interface 15 in step 33 according to the flow shown in FIG.
U17 instructs the reading unit 22 to read the area of the disk 23 designated by the host computer 12.

The reading section 22 reads the data from the disk 23 in step 34 according to an instruction from the CPU 17.
The CPU 17 judges this data at step 35, and if it is readable, transfers it at step 36 from the output end to the scanner 13 via the interface 27, and if not readable. At 39, the determination unit 19 determines whether or not the read target area is the erased area.

When the determination section 19 determines that the area is not the erased area, the CPU 17 terminates the processing as a read error in step 41 (step 38). If the result of determination that the area is the erased area is generated, CP
U17 does not act as an error, but causes the data generating section 24 to generate the dummy data in step 52, and the generated dummy data is generated.
In step 36, the data is transferred from the output terminal to the scanner 13 via the interface 27. If the data transfer is completed, the same processing is performed if there is a read command for the next block in step 37, and if not, the processing is terminated (step 38).

In each of the above embodiments, the method of recording and erasing on the recording medium is not limited, but direct overwriting is not possible, or magnetic storage is provided with a storage medium having an erase area. When applied to a device or the like, when used as a device for continuously transferring data, the processing efficiency is particularly improved.

[0025]

As described above, according to the present invention, when the data area and the erase area are mixed in the read target area secured in the logical area of the recording medium, the data is read during the data reading. Accessing the erased area does not cause an error, and discontinuous operation does not occur during reading, so data can be transferred continuously, and the host computer sends a large number of commands. Since it is not necessary to send out again, the overhead can be reduced and the burden can be reduced.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention.

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

FIG. 5 is a schematic diagram showing an arrangement example of logical blocks of a magneto-optical disk.

FIG. 6 is a schematic diagram showing an arrangement example of logical areas secured in a logical block of a magneto-optical disk.

FIG. 7 is a schematic diagram showing an arrangement example of a data area and an erase area in a secured logical area.

FIG. 8: Magneto-optical disk drive, host computer
FIG. 10 is a block diagram showing a conventional example including a scanner and a scanner.

[Explanation of symbols]

 Reference numeral 12 ... Host computer, 13 ... Scanner, 14 ... Magneto-optical disk drive device, 15 ... Interface, 16 ... Random access memory, 17 ... CPU, 18 ... Read-only memory, 19 ... Judgment part, 20 ... Erase part, 21 ... Write part, 22 ... Read part, 23 ... Disk, 24 ... -Data generator

Claims (2)

[Claims] 1. Data is reproduced from a recording medium having a first area where recording data exists and a second area where the data does not exist or has been erased in a plurality of storage areas. In the storage device, during the reading of the second area based on the signal read from the storage medium, the determination means for determining that the read target area is the second area, and the reading result of the determination means A storage device comprising means for inhibiting transfer of data to a reproduction output terminal. 2. Data is reproduced from a recording medium having a first area in which recording data exists and a second area in which no data exists or is erased in a plurality of storage areas. In the storage device, during the reading of the second area based on the signal read from the storage medium, the determination means for determining that the read target area is the second area, and the reading result of the determination means And a means for transferring dummy data to a reproduction output terminal.