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ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 71
READ POSITION (Group 1, Op. Code 34)
The READ POSITION command reports the current position of the logical unit and
any data blocks in the buffer. No tape movement shall occur as a result of the
command. The drive may disconnect during this command.
CDB for READ POSITION Command
Data Bits
Byte 7 6 5 4 3 2 1 0 Hex
0 0 0 1 1 0 1 0 0 34
1 0 0 0 0 0 0 0 BT 0X
2 0 0 0 0 0 0 0 0 00
3 0 0 0 0 0 0 0 0 00
4 0 0 0 0 0 0 0 0 00
5 0 0 0 0 0 0 0 0 00
6 0 0 0 0 0 0 0 0 00
7 0 0 0 0 0 0 0 0 00
8 0 0 0 0 0 0 0 0 00
9 0 0 0 0 0 0 0 0 00
BT: The Block Address Type bit determines the reporting method of the block
location field. If 0, the logical addresses are returned for current block and the last
block in the data buffer. If set to 1, the physical block address is returned for the first
block location and the last block in the data buffer. Information is returned to the host
in the format shown below.
READ POSITION Data Format
Data Bits
Byte 7 6 5 4 3 2 1 0 Hex
0 BOP EOP 0 0 0 BPU 0 0 XX
1 Partition Number XX
2 0 0 0 0 0 0 0 0 00
3 0 0 0 0 0 0 0 0 00
4
5
6
7
MSB
First Block Location
LSB
XX
XX
XX
XX
8
9
0A
0B
MSB
Last Block Location
LSB
XX
XX
XX
XX
0C 0 0 0 0 0 0 0 0 00
0D
0E
0F
MSB
Number of Blocks in Buffer
LSB
XX
XX
XX
10
11
12
13
MSB
Number of Bytes in Buffer
LSB
XX
XX
XX
XX