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The READ POSITION command is used to read a position identifier or SCSI
Logical Block Address (LBA). The LOCATE command uses this identifier to
position back to this same logical position in a high-performance fashion.
Bit
Byte
76543210
0 Operation Code (34h)
1 Logical Unit Number Rsv’d TCLP Long BT
2 - 8 Reserved
9 Unused Reserved Flag Link
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TCLP
Total Current Logical Position. When = 1, data returned includes block,
filemark, and setmark position and fits format described in Section 5.17.2.
When = 0, the data takes the SCSI-2 format described in Section 5.17.1.
This bit indicates the drive returns data specifying the partition, file, and
set number with the current logical position (long form). A TCLP bit of 0
indicates the device server will return data specifying the first and last
block location with the number of bytes and blocks in the buffer (short
form).
Long
When the Long bit = 1, it indicates the server will return 32 bytes of data;
a value of 0 indicates the device server will return 20 bytes of data. Both
the Long bit and the TCLP bit must both be set to 1 or 0. If these bits
have different values, the drive returns CHECK CONDITION, ILLEGAL
REQUEST.
BT
Block Type. This bit indicates how the position is to be interpreted. Since
the tape drive uses the same logical block regardless of the setting of this
bit, the setting is ignored. The logical block address values include all
recorded objects: blocks and filemarks.
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