Fujitsu M2488 manual Mode Sense Page Descriptors Field Description, Mode Sense MC Sense Keys

MEDIA CHANGER COMMANDS M2488 PRODUCT GUIDE

		Table 6-14. MODE SENSE Page Descriptors Field Description
BYTE	BIT	VALU		DESCRIPTION
		E
0	0-5			Page code identifies the meaning of the bytes in that page.
0	7		1	When using the MODE SENSE command, a PS (Parameters Savable) bit of one indi-
				cates that the mode page can be saved by the target in a non-volatile location.
			0	A PS bit of zero indicates that the supported parameters cannot be saved. When using
				the MODE SELECT command, the PS bit is reserved.
1				The Additional Page length field indicates the number of bytes the target supports in
				each page. The additional page length value of each defined page, does not include the
				Page Length byte. The target may return in the pages of the MODE SENSE com-
				mands as many consecutive bytes as it supports, for each page it supports, without
				splitting fields of multiple bytes. The page length is set in the pages of the MODE
				SELECT command to the value returned by the target in the MODE SENSE Page
				Length bytes. Otherwise, the target creates CHECK CONDITION status with the
				sense key of ILLEGAL REQUEST.

If a MODE SELECT command with SP=1 has never been successfully performed on the target, then following a power on, SCSI bus reset, BUS DEVICE RESET message, the controller reports its default mode setting whenever current, or default values are requested. If a MODE SELECT command with SP=1 was ever performed successfully, the controller will report the “saved param- eters” whenever the current or saved values are requested, and it will report the default mode set- tings only when the default parameters are requested.

6-2.3.3 MODE SENSE MC Sense Keys

One of the following sense keys may be returned if a CHECK CONDITION was indicated:

SENSE KEY	CONDITION		DESCRIPTION
1h	RECOVERED ERROR	Recovery was performed when writing buffered data, before the
		buffered mode operation occurred in MODE SENSE command.
3h	MEDIUM ERROR	1.	Write of buffered data failed due to a defective tape.
		2.	An attempt was made to write 36-track data on 18-track format-
			ted medium.
4h	HARDWARE ERROR	1.	SCSI interface error occurred due to a hardware failure (e.g.
			transfer of MODE SENSE data failed due to a hardware fail-
			ure).
		2.	Write of buffered data failed due to a hardware failure.
5h	ILLEGAL REQUEST	1. Reserved bit was found set in the CDB of the MODE SENSE
			command.
		2.	Flag bit in the MODE SENSE CDB was set and the Link bit
			was not set.

6-14 CG00000-011503 REV. A March 1997