HP Q153090901 44h, REPORT DENSITY SUPPORT

REPORT DENSITY SUPPORT 44h

The Report Density Support command returns details about the tape formats supported by the drive.

The data is returned as a header and a series of descriptor blocks.

Pre-execution checks

Illegal Field Deferred Error Unit Attention

Command descriptor block

	7	6	5		4		3	2	1	0
0					Operation	Code (44h)
1				Reserved (0)						Media
2
					Reserved (0)
6
7	(MSB)				Allocation Length
8										(LSB)
9					Control

CDB fields

Media	0	One descriptor block is returned for each format supported by the drive. The
		capacity field in the descriptor block will indicate the capacity of the current
		media.
	1	One descriptor block is returned with the data for the currently loaded tape. The
		capacity field will indicate the maximum for the format. If there is no tape
		inserted in the drive, the drive will return CHECK CONDITION with a sense key of
		NOT READY and additional sense of 3A 00h (medium not present).
Allocation	This specifies the maximum number of bytes which the drive should return in its data-out
Length	phase. Either the entire available data or allocation length bytes of the page are
	returned, whichever is least.
	0	No data transfer will occur. This is not considered an error.

Header

	7	6	5	4	3	2	1	0
0	(MSB)		Available Density Descriptor Length
1								(LSB)
2				Reserved (0)
3				Reserved (0)

The available length gives the total amount of data available to be returned.

Commands

REPORT DENSITY SUPPORT 44h 137