JPH06119127A - Method and device for accessing draw type optical disk - Google Patents

Abstract

PURPOSE:To shorten the execution time of a check command which is executed prior to writing to or reading from a DRAW type optical disk. CONSTITUTION:When the power source is turned ON or when the disk is replaced, the recorded/unrecorded areas of the DRAW type disk 14 are checked and the check result is stored in a RAM 12 provided in an input/output channel 11 to the optical disk 14; and information obtained by referring to the RAM 12 is sent back to a host in response to the check command from the host after application of power source without accessing the optical disk 14. After the writing to the optical disk 14, the contents of the RAM 12 are updated according to the writing state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for accessing a write-once optical disc in which new data can be written in an unrecorded area but the written data cannot be erased.

[0002]

2. Description of the Related Art In a write-once optical disc, when new writing and reading of data is performed according to a corresponding command from a host, generally, the optical disc is first accessed to check a recorded / unrecorded area, and the check result is sent to the host. In response, the host refers to the check result and issues another write or read command to perform the desired write or read. However, since the command for this check is executed every time writing or reading is performed, it takes a considerable time to transfer data.

[0003]

Therefore, the present invention is
An object of the present invention is to provide a method and apparatus for accessing a write-once optical disc, which can speed up the execution time of a check command performed before writing or reading in the write-once optical disc device.

[0004]

In order to achieve the above object, a method of accessing a write-once optical disc according to the present invention is to check the recorded / unrecorded area of the optical disc when the power is turned on or when the optical disc is replaced. The result is stored in the RAM provided in the input / output channel to the optical disk, and the information obtained by referring to the RAM without accessing the optical disk for the check command from the host after the power is turned on is stored in the host. Characterized by returning.

Further, the write-once type optical disc access device according to the present invention checks the RAM provided in the input / output channel to the optical disc and the recorded / unrecorded area of the optical disc when the power is turned on or the optical disc is exchanged. A means for storing the check result in the RAM and a means for returning to the host the information obtained by referring to the RAM without accessing the optical disk in response to the check command from the host after power-on are provided. And

[0006]

In the present invention, a RAM for storing the check result of the recorded / unrecorded area of the optical disk is provided in the input / output channel, and the recorded / unrecorded area of the optical disk is checked when the power is turned on or the disk is replaced. Is performed prior to the check command from the host, and the check result is stored in the RAM. In response to a check command from the host, the RAM in the input / output channel is referred to and the reference result is returned to the host without directly accessing the optical disc. Therefore, the time for data transfer accompanying the check command executed each time writing or reading is significantly reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings.

FIG. 2 shows a system configuration in which a write-once optical disc according to the present invention and a device for driving the same are connected. An optical disk controller 13 is connected to a host side interface 10 connected to a host (not shown) via an input / output channel device 11. According to the present invention, the input / output channel device 11 is provided with a RAM 12 as an information storage area for storing the check result of the recorded / unrecorded area of the optical disc. The optical disc controller 13 controls data writing to the write-once optical disc 14 or data reading from the write-once optical disc 14. The optical disk controller 13 and the write-once optical disk 14 constitute an optical disk device.

FIG. 1 shows an embodiment of the present invention implemented under the system configuration of FIG. According to the present invention, power-on and disk replacement are first monitored, and if any of them is recognized (step 1), the I / O channel device 11 performs initialization processing of power-on firmware, The program for checking the data recording / non-recording area of the write-once optical disc 14 is started, and CHE is sent to the optical disc controller 13.
A CK command (check command) is sent (step 2), the recorded / unrecorded area of the optical disc 13 is checked (step 3), and the recording / recording confirmed by the check is performed.
The address information of the unrecorded area is stored in the RAM 12 in the input / output channel device 11 (step 4). The above processing is not performed waiting for the write or read command from the host, but is performed prior to the command from the host.

Based on the above process, the I / O channel device 11 stands by in the above state, and when a check command is sent from the host, look inside the RAM 12 without actually sending the check command to the optical disk device. Then, the recorded / unrecorded area state of the optical disk 14 is confirmed and returned to the host (step 5). For the write command or the read command from the host, it is judged which one (step 6), and the write command is recorded on the optical disc 14 via the optical disc controller 13. Then, the information in the RAM 12 is updated according to the recorded information state (step 7). The read command is read from the optical disk 14 via the optical disk controller 13 and the read data is sent to the host (step 8).

As described above, the result of the check by the check command internally executed prior to the check command from the host is stored in the RAM 12 provided in the input / output channel device 11, and the check command is sent from the host. With respect to the check command of (4), the contents of the RAM 12 provided in the input / output channel device 11 are checked without recording the optical disk device each time, and the recording / writing of the optical disk 14
Since the unrecorded area is checked, it is possible to significantly reduce the execution time of the check process for the check command from the host thereafter.

[0012]

The result of the check by the check command executed prior to the writing or reading in the write-once type optical disk device is stored in the RAM provided in the input / output channel device, and the check command from the host is received. Checks the recorded / unrecorded area of the optical disk by looking at the contents of the RAM provided in the I / O channel device without accessing the optical disk device each time. Therefore, the check process for the subsequent check command from the host is performed. The execution time of can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining a method of accessing a write-once optical disc according to the present invention.

FIG. 2 is a connection diagram showing a configuration of an apparatus for implementing a method for accessing a write-once optical disc of the present invention.

[Explanation of symbols]

 10 Host Interface 11 Input / Output Channel Device 12 Information Storage Area (RAM) 13 Optical Disk Controller 14 Write-once Optical Disk

Claims (4)

[Claims] 1. A method for accessing a write-once type optical disc in which new data can be newly written in an unrecorded area, but the once written data cannot be erased. A RAM provided in the input / output channel to the optical disc after checking the recorded / unrecorded area and the check result.
The write-once optical disc is characterized in that the information obtained by referring to the RAM is returned to the host in response to a check command from the host after the power is turned on, without accessing the optical disc. how to access. 2. A method for accessing a write-once optical disc, wherein when data is additionally written to the optical disc in response to a write command from a host, the contents of the RAM are updated according to the writing result. 3. An access device to a write-once type optical disc in which new data can be written in an unrecorded area, but once written data cannot be erased, and is provided in an input / output channel to the optical disc. RAM
And a means for checking the recorded / unrecorded area of the optical disc when the power is turned on or when the optical disc is replaced, and storing the check result in the RAM, and accessing the optical disc in response to a check command from the host after the power is turned on. A device for accessing a write-once optical disc, comprising means for returning information obtained by referring to the RAM without any need to the host. 4. An access to a write-once type optical disc, further comprising means for updating the content of the RAM according to the write result when data is additionally written to the optical disc in response to a write command from the host. apparatus.