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REPORT DENSITY SUPPORT 44h
Commands
137
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
Command descriptor block
CDB fields
Header
The available length gives the total amount of data available to be returned.
Illegal Field Deferred Error Unit Attention
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
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
Length
This specifies the maximum number of bytes which the drive should return in its data-out
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.
7 6 5 4 3 2 1 0
0 (MSB)
Available Density Descriptor Length
1 (LSB)
2 Reserved (0)
3 Reserved (0)