JP2950685B2 - Channel device for optical disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel device for inputting / outputting data to / from a rewritable optical disk device in response to a request from a host device, and more particularly to write protection of a recorded area on a recording medium of the rewritable optical disk device. The present invention relates to a protection method suitable for realizing the method.

[0002]

2. Description of the Related Art Conventionally, in a rewritable optical disk apparatus capable of erasing data, write protection (write protection) is performed on each side of the medium by a write protection switch of a storage medium (a cartridge in which the medium is mounted). I was That is, conventionally, only the write protection of the entire recording area can be performed on the recording medium of the optical disk device, and it cannot be used for the application of the write-once optical disk device.

[0003]

As described above, in the prior art, the write protect switch provided on the recording medium of the rewritable optical disk device can only write protect the entire storage area of the medium. There was a problem that it could not be used for the purpose. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a channel device which can easily use a rewritable optical disk device for a write-once type.

[0004]

According to the present invention, in a channel device for inputting / outputting data to / from a rewritable optical disk device in response to a request from a host device, the optical disk device is treated as an original rewritable type or as a write-once type. An optical disk type designating means for designating an optical disk type, a recorded area detecting means for detecting a recorded area of a recording medium of the optical disk device, and an optical disk type when a write access request to the optical disk device is received from a host device. The write-once type is designated by the designation means, and the occurrence of writing to the recorded area detected by the recorded area detection means is determined as a write protection condition to determine whether write protection is necessary. Write-protection determining means for And determining whether the write access request is treated as an error or performing a write operation indicated by the request to the optical disc device in accordance with a determination result of the write determination unit. .

[0005]

In the above arrangement, the recorded area detecting means is activated, for example, when the power is turned on, detects the recorded area of the storage medium loaded in the optical disk device, and stores the address information of the area in, for example, the RAM. Keep it.

On the other hand, the user sets an optical disk type using an optical disk type designating means, for example, a switch, as to whether the optical disk apparatus is used as an original rewritable type or as a write-once type.

In such a state, when a write access request is made from the host device to the channel device, the write protection determining means in the channel device sets the specified value (switch state) of the optical disk type specifying device to a predetermined value. By comparison, and by comparing the address information indicated by the write access request with the address information of the recorded area, whether the write protect condition is satisfied, that is, the write-once type is designated by the optical disc type designating means,
When a write access request from the host device is executed, it is determined whether or not writing to the recorded area detected by the recorded area detecting means occurs.

If it is determined that the write protect condition is satisfied, that is, if it is determined that the write-once type is designated and writing to the recorded area occurs, the writing from the host device is performed. The access request is treated as an error, the recorded area is write-protected, and the rewritable optical disk device is used as a write-once type.

On the other hand, when it is determined that the write protect condition is not satisfied, that is, when it is determined that the rewritable type is designated, or even when the write-once type is designated, the write access to the outside of the recorded area is performed. If it is determined that the request is a request, a write operation is performed on the optical disk device indicated by the write access request from the host device, and the rewritable optical disk device is used as an original rewritable type.

[0010]

FIG. 1 is a block diagram showing the configuration of a rewritable optical disk connection system including a channel device for a rewritable optical disk device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a system bus of a host device (not shown). A channel device 2 is connected to the system bus 1, and a rewritable optical disk device 3 is connected to the channel device 2. The rewritable optical disk device 3 includes an optical disk drive 31 and the drive 3
And an optical disk controller 32 for controlling the optical disk controller 1.

The channel device 2 includes an interface (host interface) 21 with the host device, an interface (disk interface) 22 with the rewritable optical disk device 3, and an optical disk as a recording medium loaded in the rewritable optical disk device 3 ( ) Is used as an original rewritable type or a write-once type, a microprocessor 24 which forms a control center of the apparatus, and the contents (on / off state) of the switch 23 are stored in the microprocessor 24. And an internal bus 28 for connecting the interfaces 21, 22, 25, the microprocessor 24, the ROM 26, and the RAM 27.

The ROM 26 has a recorded area detection program 261 for detecting a recorded area of a storage medium loaded in the rewritable optical disk device 3 in an initialization process when the power is turned on, and a disk write from the host device. A request (disk write command) is accepted to determine whether write protection is necessary,
When write protection is required, various programs (firmware programs) including a write protection determination program 262 for treating a disk write request as an error are stored in advance.

A recorded area information setting section 27 in which address information indicating a recorded area detected by execution of the recorded area detection program 261 is set in the RAM 27.
1 is secured. Next, the operation of one embodiment of the present invention will be described with reference to the flowchart of FIG.

First, in the configuration of FIG. 1, the user uses the switch 23 provided in the channel device 2 to use the rewritable optical disk device 3 (the storage medium loaded in the optical disk drive 31) as the original rewritable type. Or specify whether to use it as a write-once type. In this embodiment, when the state of the switch 23 is off ("0"), the rewritable type is designated, and when the switch 23 is on ("1"), the write-once type is designated.

The microprocessor 24 in the channel device 2 performs an initialization process according to an initialization program stored in the ROM 26 when the power is turned on. The initialization program includes a recorded area detection program 261 and is started in the initialization processing.

According to the recorded area detection program 261, the microprocessor 24 records data recorded on a recording medium (optical disk) loaded (mounted on a cartridge) in the rewritable optical disk apparatus 3 connected to the channel apparatus 2. A detection check of the area and the unrecorded area is performed. The microprocessor 24 then starts the detected start address (sector address) of the recorded area on the storage medium.
Then, the end address (sector address) is written in the recorded area information setting section 271 secured in the RAM 27.

It is assumed that the initialization process by the microprocessor 24 is completed, and thereafter, a disk write request is given from the host device to the channel device 2 via the system bus 1. This disk write request includes a write start address (sector address) SA indicating the start position of the disk write destination area and a size (number of sectors) SIZE.
And passed to the microprocessor 24. Then, the write protection determination program 2 in the ROM 26
62 is activated.

The microprocessor 24 executes the write protection determining process of the procedure shown in the flow chart of FIG. 2 in accordance with the write protection determining program 262 as follows.

First, the microprocessor 24 reads the state of the switch 23 via the switch interface 25, and compares and checks whether or not the state is "1" (ON) (step S1).

If the state of the switch 23 is not "1", that is, if it is "0" (off), the microprocessor 24 is instructed to use the rewritable optical disk device 3 as an original rewritable type. Then, the optical disk writing mechanism (not shown) is activated to cause the rewritable optical disk device 3 to perform a write operation specified by a disk write request from the host device (step S).
2).

On the other hand, the state of the switch 23 is "1".
In the case of (ON), the microprocessor 24 determines that the use of the rewritable optical disk device 3 as a write-once type is specified. In this case, the microprocessor 24 determines whether or not the write start address SA specified in the disk write request indicates the inside of the recorded area indicated by the address information set in the recorded area information setting unit 271 of the RAM 27. Is checked based on whether the condition of recorded area start address ≦ SA ≦ recorded area end address is satisfied (step S3).

If the write start address SA does not indicate the inside of the recorded area, the microprocessor 2
No. 4 indicates whether the address indicating the sum of the write start address SA specified in the disk write request and the disk write destination area size SIZE (that is, the end address of the disk write destination area) indicates the inside of the recorded area. Is checked based on whether or not the condition of recorded area start address ≦ “SA + SIZE” ≦ recorded area end address is satisfied (step S4).

If the address indicating the sum of the write start address SA and the disk write destination area size SIZE (end address of the disk write destination area) does not indicate the inside of the recorded area, the microprocessor 24
It is determined that the disc write destination area specified by the disc write request from the host apparatus is outside the recorded area on the recording medium loaded in the rewritable optical disc apparatus 3, and the above-described case of the rewritable type designation is considered. Similarly, an optical disk write mechanism (not shown) is activated to cause the rewritable optical disk device 3 to perform a write operation specified by a disk write request from the host device (step S2).

On the other hand, when the write start address SA indicates the inside of the recorded area, or (even if the SA does not indicate the inside of the recorded area), the sum of the SA and the disk write destination area size SIZE is used. (The end address of the disc write destination area) indicates the inside of the recorded area, the microprocessor 24 executes the disc write requested by the host device (when the disc write requested by the host device is executed). It is determined that writing occurs (at least one sector). In this case, the microprocessor 24 treats a disk write request from the host device as an error, notifies an error to the device, and does not execute the disk write. As a result, write-protection of only the recorded area on the recording medium loaded in the rewritable optical disk device 3 is realized, and the rewritable optical disk device 3 can be used as a write-once type.

In the above embodiment, the description has been made on the assumption that the data recorded area on the recording medium loaded in the rewritable optical disk device 3 (mounted on the cartridge) is detected when the power is turned on. By performing this even when replacing the cartridge, more reliable write protection can be realized.

Further, when a disc write operation is performed on the (rewritable) optical disc device 3 (in the data non-recorded area of the recording medium), the data is recorded on the basis of the address information of the write destination.
By updating the contents of the recorded area information setting unit 271 of the AM 27, more reliable write protection can be realized. If there are a plurality of recorded areas, the same processing as in steps S3 and S4 may be executed for each recorded area.

[0028]

As described in detail above, according to the present invention,
In addition to specifying whether to treat the rewritable optical disk device as an original rewritable type or as a write-once type, the channel device detects the recorded area of the recording medium of the optical disk device. On the other hand, when a write access request to the optical disk device is given, whether the write-once type is specified and whether write-protection is required on the condition that writing to the above-mentioned recorded area occurs is required. Whether the write access request is treated as an error and write protection is performed or the requested disk write operation is performed is determined by the channel device, so if the write-once type is specified, Is a write-once type application where the recorded area of a rewritable optical disc It can also be used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a rewritable optical disk connection system including a channel device for a rewritable optical disk device according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a write protection determination process according to a write protection determination program 262 by a microprocessor 24 in the channel device 2 of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... System bus, 2 ... Channel device, 3 ... Rewritable optical disk device, 23 ... Switch (optical disk type designating means), 24 ... Microprocessor, 26 ... ROM, 2
7 RAM, 261 recorded area detection program, 2
62: write protection discrimination program, 271: recorded area information setting unit.

Claims (2)

(57) [Claims] A channel device for inputting / outputting data to / from a rewritable optical disk device in response to a request from a host device specifies whether the optical disk device is to be used as a rewritable type or a write-once type. An optical disc type designating means for performing recording; a recorded area detecting means for detecting a recorded area of a recording medium of the optical disc device; a write- once type by the optical disc type designating means when a write access request to the optical disc device is received from the host device. Is specified, it is determined whether or not writing occurs in a recorded area, and if it is determined that writing occurs in the recorded area, write protection means for rejecting the write access request is provided. Characterized channel device. Wherein said recorded area detecting means, the channel device according to claim 1, wherein performing at least power-on detection of the recorded area.