HP C737990900 - Manual (Page 123)

Commands 123
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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
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 insterted in the drive, the
drivr eill return CHECK CONDITION with a sens 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.