JPH03183069A - Magneto-optical disk data transfer method - Google Patents

Abstract

PURPOSE:To suppress the move of an optical head with a low-speed operation at a minimum and to increase speed for transferring data by totally sending the data of normal sectors as alternative destinations to a host computer later. CONSTITUTION:An alternative sector control part 11 controls information showing the alternated defective sector and where the sector is alternated, and when the sector to be next read by a sector detection part 12 is alternated, the detection part 12 is instructed so as to skip the read of the sector. Then, it is informed of a sector order number applying part 10 that the read of one sector is skipped. The number applying part 10 adds 1 to a sector order number 72 to be applied to next sector data 42 through a host interface part 9. The control part 11 holds the information showing the skipped sector read and after reading a series of sector data, the optical head is moved to a normal sector area as the alternative destination based on the information. Then, the data of the alternative destination sector are sent to a host computer 11. At that time, the alternative sector control part 11 notifies the order number 72, which is originally sent out, of the sector data 42 to the number applying part 10.

Description

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

The present invention relates to data transfer performed from a magneto-optical disk device that records and reproduces information on a magneto-optical disk on which data can be written, erased, and read based on instructions from a host computer, to a host computer. (In other words, it is related to a method for continuously transmitting data that a host computer performs to a magneto-optical disk device.) In particular, it reduces the seek operation of the optical head of a magneto-optical disk device as much as possible during data transfer, enabling high-speed data transfer. The present invention relates to a magneto-optical disk data transfer method. Note that in the following figures, the same reference numerals indicate the same or corresponding parts.

[Conventional technology]

A magneto-optical disk has a perpendicularly magnetized film formed on a substrate, and records information by changing the direction of magnetization to the direction of the external magnetic field using an external perpendicular magnetic field and heat from a laser beam. FIG. 5 shows an example of the configuration of a magneto-optical disk (also referred to as a medium). Tracks 2I for recording and reproducing information on the magneto-optical disk are arranged spirally from the inner circumference, and information is continuously recorded on the tracks 21. recording track 2
1, a track number is assigned in order for each revolution, and the track is divided into a plurality of sectors consisting of an ID section and a data section. In this case, track 2 for one rotation
1 is divided into 16 sectors, and each sector is assigned a sector number from 1 to 16. FIG. 6 shows an example of the structure of sectors. In the figure, the l sector is divided into a 00 section 31 and a data section 32. In the 00 section 31, a track number 36 and a sector number 37 uniquely assigned to that sector are written. The data section 32 stores data 42 that the upper host computer is unable to read. In the data section 32, information is stored based on the magnetization direction on the medium as described above, whereas in the 00 section 31, unevenness is provided on the medium, and information is read by changing the reflectance of light. Magneto-optical disks have a high defect rate because they are stored at extremely high density. Therefore, when a defective sector is detected, the data is substituted with another sector, thereby apparently reducing the probability of occurrence of a sector defect. Replacement sectors are often newly generated due to scratches caused during use of the disk, and are replaced in the order in which they occur, so the order of the replacement sectors is irregular. SCS I (SmallCo
The data read command from these disk devices instructs the disk device the first sector number and the number of consecutive sectors to be read, and reads the data sent from the disk device as is. This involves storing data in the computer's internal memory in sequence. Therefore, when a host computer reads continuous sectors including substituted sectors in a magneto-optical disk device, the data of each sector is stored in the memory of the host computer as if the sectors were normally arranged without substitution. The following two methods have been used to store in numerical order. ■Read the consecutive sectors immediately before the replaced sector,
In a sector that has been replaced due to a fault, the optical head is caused to seek to a track containing a normal sector that has been replaced, and the data of the normal sector is read and transmitted. After that, the head is returned to the normal sector immediately after the replaced defective sector, and the same operation is continued. ■Having a large memory inside the magneto-optical disk device,
While skipping the substituted defective sector, sectors of the designated area are continuously stored in the memory until the memory capacity allows, and then the head seeks to the substituted normal sector part and reads the data; The subsequent data is stored at the position where the subsequent data should be within the sector range previously read into the memory. Next, this group of sector data is continuously sent to the host computer in the sector order.

[Problem to be solved by the invention]

However, in the above two reading methods, there is a problem with (2) that every time there is a defective sector, a seek operation of the head of the normal sector that replaces it occurs, slowing down the data read speed, and (3) with magneto-optical disks. Although it is possible to improve the successive output speed by requiring a large memory within the device, there are problems in that the cost increases and the mounting area also increases. Therefore, it is an object of the present invention to provide a magneto-optical disk data transfer method that can solve these problems.

[Means to solve the problem]

In order to solve the above-mentioned problems, the method of the present invention is based on the following method. When transferring data to a computer, the magneto-optical disk device transfers data for each sector (sector sequence number adding unit 1).
0, etc.), and at this time, if the data in question is in the sector replaced as described above, the data is The sector order number of the sector before replacement is added, and at least the data of consecutively arranged sectors including the faulty sector among the sectors involved in the data transfer is detected (via the sector detection unit 12, etc.). After transferring the data in the order of the sector arrangement and skipping the faulty sector, the data of the substituted normal sector is transferred based on a seek etc. of the sector, and the host computer receives the data by the data transfer. The data for each sector (via the sector data sorting unit 7 or the like) is rearranged in the correct order based on the sector order number.

[For use]

Sector data is transferred to the host computer in the order in which the sectors are arranged, starting from the designated first sector in the magneto-optical disk device. Even if there is a replaced sector on the way, it is skipped and the next sector is read, and the replacement destination normal sectors are read all at once and transferred to the host computer. In transferring these data to the host computer,
Sequence number information is included in each sector data to be transferred, and the host computer stores the read data in a corresponding location in the memory based on the sector number information.

【Example】

The present invention will be explained in detail below using FIGS. 1 to 4. FIG. 1 is a block diagram showing the configuration of a system for reading and writing a magneto-optical disk as an embodiment of the present invention. In the figure, 1 is an upper host computer, 2 is a magneto-optical disk device, 3 is a disk interface, and 4 is a host C.
PU, 5 is a host memory, 6 is a drive interface section, 7 is a sector data alignment section, 8 is a drive control section, 9 is a host interface section, 10 is a sector sequence number addition section, 11 is an alternative sector management section, 12 is a The sector detection section 13 is an optical head control section. A host computer 1 is connected to a magneto-optical disk device 2 via a disk interface 3, and instructs the first sector number and number of sectors to be read and written as commands. When writing, write data is sent to the magneto-optical disk device 2 following a command, and when writing continues, sector data from the magneto-optical disk 2 is received. At the bottom of the main tank, disk interface 3 has 8 bits (1
The host computer 1 and the magneto-optical disk device 2 exchange commands and data using a handshake method for each byte. FIGS. 3 and 4 show examples of the structure of this command and data, respectively. That is, FIG. 3 shows a command format for the magneto-optical disk device 2 of the host computer 1. In the figure, a command identification code 62 indicating the command type, such as successive or writing, is entered at the beginning of a command block 61. Next, the first sector number 6 to be read or written
3 and the number of sectors 64 are stored. Further, FIG. 4 shows the structure of a data block 71 for successive writing. A correct sequential order number 72 of the sector data is stored for each sector data 42, and the host computer 1 uses this number 72 to correctly align the sector data 42. Returning to FIG. 1 again, the host computer 1 is the host CP
U4, host memory 5, drive interface unit 6,
It is composed of a sector alignment section 7. The host CPU 4 manages the operation of the host computer 1 as a whole. The host memory 5 stores information required by the host CPU 4. The drive interface section 6 is a magneto-optical disk device 2.
Controls the exchange of commands and data with. Regarding data, the drive interface unit 6 stores or writes the received data sequentially from the start address of the transfer data in the host memory 5, which is set before the host CPU 4 starts read/write operations on the magneto-optical disk. Send out the data that should be input. The sector data alignment unit 7 is a part added according to the present invention. Conventionally, when disk data continues to be received, the magneto-optical disk device 2 sends out the successive data in the correct order, and the host computer 1 stores the received data in the host memory 5 in the same order, but the present invention In order to improve the successive output speed, data for each sector is sent to the host computer 1 in random order. Therefore, the sector data alignment unit 7 determines the proper position in the host memory 5 where the sector data 42 should be stored, based on the sector order number 72 added to the beginning of the data block 71, as shown in FIG. Then, the relevant sector data 42 is stored in the correct position. The magneto-optical disk device 2 includes a drive control section 8, a host interface section 9, a sector sequence number addition section 10, an alternative sector management section II, a sector detection section 12, and an optical head control section 1.
Consists of 3. The drive control unit 8 receives successive write commands from the host computer 1 and manages the overall operation of the magneto-optical disk 2 . The optical head control section 13 positions the optical head on the target track according to instructions from the drive control section 8. The sector detection section 12 monitors the ID section 31 of the sector based on the read data of the track from the optical head (not shown) in response to an instruction from the drive control section 8, and determines whether it is a sector to be read or written. At this time, if it is a read operation, the sector data 42 is transferred to the drive control unit 8. The data is sent to the host computer 1 through the host ink face section 9. At this time, the sector order number adding section 10 sequentially outputs the sector order number 72 of each sector data 42 sent to the host computer 1 side to the host interface section 9, and causes it to be added to each corresponding sector data 42. The replacement sector management unit 11 manages information about replaced defective sectors and where they are replaced,
If the sector that the sector detection unit 12 is about to read next has been replaced, it instructs the sector detection unit 12 to skip that sector, and also indicates that the sector sequence number addition unit has skipped one sector. Notify 10. Upon receiving this notification, the sector sequence number adding unit 10 adds +1 to the sector sequence number 72 to be added to the next sector data 42 via the host interface unit 9. The information on the skipped sector is held by the alternative sector management unit 11, and after reading a series of sector data, the optical head is moved to the normal sector area of the replacement destination based on that information, and the data of the replacement destination sector is stored. is sent to the host computer 1 using the procedure described above. At this time, the alternative sector management unit 11 notifies the sector sequence number addition unit 10 of the sequence number 72 to which the sector data 42 should originally be sent. As a result, the sector sequence number addition unit 10 outputs the sequence number 72 to the host interface unit 9 and causes it to be added to the subsequent data 42 of the replacement destination sector. FIG. 2 shows the reading order of consecutive sectors including replaced sectors. In this example, the 4th and 7th defective sectors 52 are replaced with replacement sectors 53, and in the conventional case 1, 2. ..., sector data is sent in the correct order of the 12th sector and the sector, but in the present invention, the normal sector 51
After transferring only the data in the sector number order while skipping the defective sector 52, the data in the replacement sector 53 is sought and transferred.
5.68, 9.10.11.12. 4. Sector data 42 is sent in the order of 7.

【Effect of the invention】

According to the present invention, when a magneto-optical disk device sends read data from a specified continuous sector area to a host computer based on a command from a host computer, a sector that contains an internal failure and is replaced by a specific area is detected. , even if it exists in a sector that is to be read continuously, the sector is first skipped and the sector data is sent to the host computer, and then the data of the normal sector that is the replacement destination is later collected and sent to the host computer. Because I made it so that
Data can be transferred while minimizing the movement of the slow-moving optical head. Therefore, the data transfer speed can be improved in a magneto-optical disk device in which many alternative sectors are expected to occur. Moreover, it becomes unnecessary to use a large amount of expensive memory.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the system configuration as an embodiment of the present invention, FIG. 2 is an explanatory diagram of the sequential sector reading order, FIG. 3 is the constituent countries of the command block, and FIG. 4 is the data FIG. 5 is a diagram showing an example of the configuration of a magneto-optical disk, and FIG. 6 is a diagram showing an example of a sector configuration. l: host computer, 2: magneto-optical disk device, 3
: Day-Sphin Tough Ace, 4: Host CPU, 5:
Host memory, 6: Drive interface unit, 7: Sector data alignment unit, 8 Drive control unit, 9: Host interface unit, 102 All sector sequence number addition unit 11:
Alternative sector management section, 12: sector detection section, 13: optical head control section. Figure 2 Spear Figure 5

Claims (1)

[Claims] 1) In data transfer performed by a magneto-optical disk device having a function of substituting a faulty sector with another normal sector to a host computer that reads and writes data in this device, the magnetic disk Add a sector order number for each sector of data to be transferred,
At this time, if the relevant data is in the sector replaced as described above, the sector order number of the sector before replacement is added to the data, and at least the sector sequence number of the sector before the replacement is added to the data. The data of consecutive sectors including the faulty sector is
After transferring the data in the order of the sector arrangement and skipping the faulty sector, the data of the substituted normal sector is transferred based on a seek etc. of the sector, and the host computer receives the data by the data transfer. 1. A method for transferring data on a magneto-optical disk, characterized in that data for each sector is rearranged in the correct order based on the sector order number.