HP Q153090901 - Manual (Page 127)

READ POSITION 34h
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READ POSITION 34h
The READ POSITION command returns data representing the current logical position to the host.
The position is the count of all marks and blocks between BOM and the current logical position.
The first block is block 0.
The command causes no tape movement.
The Read Position command is complimented by the LOCATE command.
Pre-execution checks:
Command descriptor block:
CDB fields:
Illegal Field Reservation Deferred Error
Unit Attention Media Access Diagnostic Status
7 6 5 4 3 2 1 0
0 Operation Code (34h)
1 Reserved(0) Service Action
2
Reserved (0)
6
7
Allocation Length
8
9
Control
Service Action The following values are supported:
00h
06h
08h
Short Form Block ID
Long Form
Extended Form
Allocation Length For Service Actions 00h and 06h, must be 0.