JPH05258467A - System for controlling optical magnetic disk - Google Patents

Abstract

PURPOSE:To use the optical magnetic disk in the same way as the magnetic disk by providing an offset value storage area on a recording medium and providing an offset value storage register on a channel device. CONSTITUTION:A bender-unique management area 18 storing an offset value 19 of the leading address of a user section 17 where a host device 13 is available is provided on a recording medium 15. An offset value storage register 20 storing the offset value 19 is provided in the channel device 12. In this construction, when a command is issued from the host device 13 to the optical magnetic disk 11, the channel device 12 refers to an offset storage register 20. When no effective offset value 19 is stored, the bender-unique management area 18 is read to store the offset value 19 of the leading address of the user section 17 in the register 20. Thus, the optical magnetic disk 11 can be used in the same way as the normal magnetic disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a magneto-optical disk device. Since the magneto-optical disk device is a device that can be randomly accessed like a general magnetic disk device, there is a strong need to use it with the same interface as the magnetic disk device. However, the medium of the magneto-optical disk device that supports the format according to the standard convention (for example, ISO convention) uses a part of the recordable area as the management area, and the upper program that uses the apparatus is , The host device must be aware of the offset value of the usable area before use.

Therefore, it is necessary to support the magneto-optical disk device with an interface equivalent to the magnetic disk device.

[0003]

2. Description of the Related Art FIG. 4 shows a medium of a conventional magneto-optical disk device.
Shown in. In FIG. 4, reference numeral 1 denotes a medium of the magneto-optical disk device which is formatted according to the standard rules. Reference numeral 2 is a management section defined by the standard contract, and 3 is a user section that a user can use for recording information.

When the host device accesses the medium 1, the head of the user partition 3 actually usable is not the seek address 0 but the seek address J. On the other hand, in a normal magnetic disk device, the head of the user partition that can be used by the host device is the seek address 0. Therefore, in this state, the host device is the seek address of the magnetic disk device and the magneto-optical disk device. The calculation method must be switched.

That is, when accessing the magneto-optical disk device, since the head address of the medium 1 differs depending on the size of the user partition 3, it is necessary to investigate the format of the medium 1 and access at the start address corresponding thereto. .

[0006]

In such a conventional magneto-optical disk device, a program for investigating the format of the medium and investigating the start address of the user partition is required, so that the burden of software creation is reduced. There is a problem that it cannot be used without distinguishing it from a general magnetic disk device.

The present invention has been made in view of the above-mentioned conventional problems, and eliminates the need for a program for investigating the start address of the user area. It is an object of the present invention to provide a control system for a magneto-optical disk device that can use the magnetic disk device.

[0008]

The present invention, as shown in FIG. 1, is a medium 1 formatted according to standard conventions.
In an information processing apparatus having a magneto-optical disk device 11 equipped with 5, a channel device 12 for controlling the magneto-optical disk device 11, and a host device 13 for issuing a command, the host device 13 uses the medium 15 for the medium 15. Offset value 1 of the start address of user partition 17 that can
A vendor-unique management area 18 for storing 9 is provided, and the offset value 1 is set in the channel device 12.
An offset value storage register 20 for storing 9 is provided.

Further, according to the present invention, notifying means 11A for notifying the channel device 12 of the unit attention condition when the medium 15 is replaced is provided in the magneto-optical disk device 11. Further, according to the present invention, when the medium 15 is not subjected to the predetermined format processing, the channel device 12 is provided with the notifying means 12A for notifying the host device 13 that the medium 15 is unformatted.

Further, according to the present invention, when the medium 15 is not subjected to a predetermined format process, the medium 15 is formatted according to the standard rule, and the vendor-unique management area 18 is provided after the management partition 16 of the standard rule. The format processing means 13A for creating the above is provided in the host device 13.

[0011]

In the present invention, when a command is issued to the magneto-optical disk device 11 from the host device 13, the channel device 12 refers to the offset storage register 20, and when a valid offset value 19 is not stored, The vendor unique management area 18 is read, and the offset value 19 of the head address of the user section 17 is stored in the offset value storage register 20.

Next, when the host device 13 has issued a seek command instructing the access position on the medium 15,
The offset value storage register 20 is assigned to the designated address.
Is added to operate the magneto-optical disk device 11 as an actual seek address. Thereby, the host device 13
Does not care about the standard format or the size of the management area 18, and obtains the access space with the head of the user section 17 at address 0.

When the medium 15 is exchanged prior to this access, the magneto-optical disk device 11 operates as a channel device 12.
Is notified of a unit attention condition (UAT), whereby the channel device 12 judges that the medium 15 has been replaced, and re-executes the above operation. When the medium 15 is unformatted or when the management area 18 is not created, the channel device 12 notifies the host device 13 of this.

The host device 13 sets the medium as the medium 15 according to the standard rule and creates the management area 18 having the offset value 19. As a result, the UAT is generated. As described above, the magneto-optical disk device 11 having a medium format different from that of the magnetic disk device can be accessed by a command interface equivalent to that of the magnetic disk device, without the need for a program for investigating the format of the medium. The magneto-optical disk device 11 can be used without distinction from the above-mentioned magnetic disk device.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 are views showing an embodiment of the present invention. In FIG. 2, 11 is a magneto-optical disk device, 12 is a channel device for controlling the magneto-optical disk device 11, and 13 is a channel device.
Is a CPU that is a higher-level device that issues commands, and 14 is a C
It is a main storage device connected to the PU 13.

A magneto-optical disk device 11 is loaded with a medium 15 as shown in FIG. In FIG. 3, 16 is a management partition defined by the standard contract, 17 is a user partition that a user can use for recording information, and 18 is a vendor unique management that stores an offset value 19 of the head address of the user partition 17. It is an area (hereinafter, VU management area).

The VU management area 18 is provided after the management partition 16 so as to have an arbitrary length, and is also used as a management area which is insufficient in a standard format such as a CE track. The VU management area 18 is used by the CPU when formatting the medium.
13 is created using a series of formatting commands uniquely prepared for the magneto-optical disk device 11.

That is, when the formatting process is not performed, the CPU 13 formats the medium according to the standard rule, and after the management partition 16 of the standard rule, the VU.
It has a function as the format processing means 13A for creating the management area 18. Once formatted media 15
Is accessed by a command compatible with the command for accessing the magnetic disk device.

In accessing, when the medium 15 is exchanged, the magneto-optical disk device 11 has a function as a notifying means 11A for notifying the channel device 12 of a unit attention condition (hereinafter referred to as UAT). The channel device 12 is a medium 15 of the magneto-optical disk device 11.
When the first booting is performed, the VAT management area 18 is read by using the UAT reported by the magneto-optical disk device 11 as a trigger, and the usable offset of the user partition 17 recorded therein is known. By executing the seek operation emulated as, the CPU 13 is provided with an interface equivalent to the magnetic disk device.

When accessing, if the medium is unformatted or if the VU management area 18 is not set, the channel device 12 instructs the CPU 13 to
Notifying means 12 for notifying that it is an unformatted medium
It has the function of A. Next, the operation will be described. First, a normal access process will be described.

After the formatting is completed, access to the magneto-optical disk device 11 in which the medium in which the VU management area 18 has been created is mounted is performed as follows. When a command is issued to the magneto-optical disk device 11, the channel device 12 refers to the offset value storage register 20. At this time, if the access is the first operation to the magneto-optical disk device 11, the offset value storage register 20
Does not contain a valid value.

Therefore, the following operation 1 is started. If no valid value is stored in the offset value storage register 20, the channel device 12 reads the VU management area 18 of the medium stored in the magneto-optical disk device 11, and the CPU 13
The offset value 19 of the start address of the user partition 17 that can be used by the
Store to.

Next, operation 2 is entered. When the CPU 13 has issued the seek command for instructing the access position on the medium 15 of the magneto-optical disk device 11, the value of the offset value storage register 20 is added to the instructed address and the magneto-optical disk is actually used as the seek address. Device 11
To operate.

Control commands other than seek commands and read / write commands are operated as they are. As a result, the CPU 13 obtains an access space with the head of the user area 17 at address 0 without being aware of the standard format and the size of the VU management area 18.

Next, the offset value re-reading process when the medium is replaced will be described. Since the magneto-optical disk device 11 is a medium exchange type device, the medium 15 may be replaced by an operator. When the medium 15 is replaced, the magneto-optical disk device 11 holds the UAT. The magneto-optical disk device 11 holding the UAT notifies the channel device 12 of the UAT only once when the first command is activated after the UAT is generated, and releases the condition.

During the normal operation, when there is an access instruction from the CPU 13, since the offset storage register 20 is set, the processing of the operation 2 is executed. If the medium 15 has been exchanged prior to this access, the magneto-optical disk device 11 sends U to the activation of the channel device 12.
Notify AT. When the channel device 12 is notified of the UAT, the channel device 12 determines that the medium 15 has been exchanged, re-executes the processing of the operation 1 to update the offset value storage register 20, and then executes the operation 2. Management area 18
Even if the medium 15 having a different size is exchanged, the address of the user partition 17 can be correctly emulated.

Next, the processing when accessing the unformatted medium will be described. When the channel device 12 executes the process of operation 1, when the medium 15 is unformatted or when the VU management area 18 has not been created, when the CPU 13 makes an access, the channel device 12 receives a command other than a command for formatting. Reject execution and notify that it is unformatted.

C notified of being unformatted
The PU 13 cannot access the medium 15 unless the formatting process described below is executed.
Next, the format processing of the medium will be described. The formatting of the medium is executed by the CPU 13 using a command equipped for formatting. (1) A command for formatting the medium into a format conforming to the standard convention is executed to make the medium 15 conforming to the standard convention. (2) A VU management area 18 is created after the management partition 16 of the standard contract by using a format command.
The format command operates without changing the logical address of the magneto-optical disk device 11 without adding the offset value 19 to the seek address. (3) Operation 1 when a general access is subsequently performed
The command for invalidating the offset value storage register 20 is executed so that the offset value storage register 20 is reset by the processing of.

As described above, a magneto-optical disk device 11 having a medium format different from that of the magnetic disk device can be used by the command interface equivalent to the magnetic disk device without the need for a program for investigating the start address of the user partition 17. It can be accessed, and the magneto-optical disk device 11 can be used without distinguishing it from an ordinary magnetic disk device.

[0030]

As described above, according to the present invention, it is possible to use the magneto-optical disk device without distinguishing it from the magnetic disk device, without the need for a program for investigating the format of the medium.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the principle of the present invention.

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

FIG. 3 is a block diagram of a medium

FIG. 4 is a diagram showing a medium of a conventional magneto-optical disk device.

[Explanation of symbols]

 11: Magneto-optical disk device 11A: Notification means 12: Channel device 12A: Notification means 13: CPU (upper device) 13A: Format processing means 14: Main storage device 15: Medium 16: Management partition 17: User partition 18: VU management Area 19; Offset value 20: Offset value storage register

Claims (4)

[Claims] 1. A magneto-optical disk device (11) equipped with a medium (15) formatted according to standard rules.
A channel device (12) for controlling the magneto-optical disk device (11) and a host device (13) for issuing a command
In the information processing apparatus having the above, a vendor-unique management area (18) for storing an offset value (19) of a head address of a user section (17) that can be used by the host apparatus (13) in the medium (15) And the channel device (12)
A control system for a magneto-optical disk device, characterized in that an offset value storage register (20) for storing the offset value (19) is provided therein. 2. A notification means (11A) for notifying the channel device (12) of a unit attention condition when the medium (15) is replaced, is provided in the magneto-optical disk device (11). A control system for a magneto-optical disk device according to claim 1, wherein: 3. A notification means (12A) for notifying the host device (13) that the medium (15) has not been formatted when a predetermined format process has not been performed.
2. The control system for the magneto-optical disk device according to claim 1, wherein a control device is provided in the channel device (12). 4. When the medium (15) has not been subjected to a predetermined formatting process, the medium (15) is formatted in accordance with the standard rules, and the standard rule management section (1) is used.
6. The control system for the magneto-optical disk device according to claim 1, further comprising a format processing means (13A) for creating the vendor-unique management area (18) after the step 6) in the host device (13). ..