READ DISC STRUCTURE command

Takaharu Ai ai.takaharu at jp.panasonic.com
Fri Sep 30 01:17:40 PDT 2005


* From the T10 Reflector (t10 at t10.org), posted by:
* Takaharu Ai <ai.takaharu at jp.panasonic.com>
*
Hello Mt.Fuji members and MMC members,


We find one small problem on Mt.Fuji6 Rev 0.95.

The problem is on READ DISC STRUCTURE command with Format code=FFh.
The current definition is;

    The Format Code value of C0h through FFh are used to return media
    independent information. Regardless of the Sub-command field value
    in CDB, the same information is returned to the host.

But the following contents of the Format Code value of FFh varies
according to Sub-command.
  - DISC STRUCTURE Data Length
  - Format Codes applicable to the specified Sub-command
Also, Layer Number field in CDB for FFh is meaningless.


So, we think the definition should be;

    The Format Code value of C0h through FEh are used to return media
    independent information. Regardless of the Sub-command field value
    in CDB, the same information is returned to the host.

    For Format Code value of FFh, supported Format Codes for the
    specific Sub-command and their length shall be returned according to
    the Subcommand field value in CDB.

And the Layer Number field for Format Code FFh should be Reserved.


Harry Ai
MSDC
Panasonic AVC Networks Company
Matsushita/Panasonic
Osaka, Japan



*
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org





More information about the T10 mailing list