HP Q153090901 Request Sense data

Allocation	0	No data is transferred to the host.
Length	>0	The maximum amount of sense data in bytes that should be transferred to the host.

The drive returns up to Allocation Length bytes of data; any extra sense data is lost.

Request Sense data

Sense data is recovered from the drive by means of a REQUEST SENSE command following the reporting of CHECK CONDITION by the drive. There are two formats in which the data can be returned: Fixed and Descriptor.

Fixed format

The Fixed format of the returned data is as follows:

	7	6	5		4	3	2	1	0
0	Valid					Error Code
1				Segment Number (0)
2	Mark	EOM	ILI		Rsvd(0)		Sense Key
3	(MSB)				Information Bytes
6									(LSB)
7			Additional Sense Length (10h)
8	(MSB)		Command Specific Information Bytes
11									(LSB)
12				Additional Sense Code
13			Additional Sense Code Qualifier
14				Field Replaceable Unit Code
15	SKSV	C/D	Reserved (0)			BPV		Bit Pointer
16	(MSB)		Field Pointer/Drive Error Code
17									(LSB)
18–20					Reserved (0)
21		Reserved (0)				CLN		Reserved (0)
22
					Pad bytes (0)
23

Returned Sense data fields:

Valid	1	Indicates that the information bytes contain valid information as defined in
		the SCSI specification.
Error Code	70h	Indicates that the error is current, that is, it is associated with the command
		for which CHECK CONDITION status has been reported.

148 Commands