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SCSI Commands
Bits
Byte
7
6
0
BOP
EOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Field Descriptions
Field
Bytes
Bits
BOP
0
7
EOP
0
6
BPU
0
2
Partition
1
Number
First Block
4-7
Location
Last Block
8-11
Location
Number of
13-15
blocks in
buffer
Number of
16-19
bytes in
buffer
Reserved
The First Block Location and the Last Block Location are both set to the number of
blocks and file marks between BOT and current logical position. If the tape is at BOT,
0 is returned in these fields. The Beginning of Partition (BOP) flag is set if the Block
Location fields are zero.
5
4
3
Reserved
Partition Number (0)
Reserved
Reserved
First Block Location, MSB
First Block Location
First Block Location
First Block Location, LSB
Last Block Location, MSB
Last Block Location
Last Block Location
Last Block Location, LSB
Reserved
Number of blocks in buffer, MSB
Number of blocks in buffer
Number of blocks in buffer, LSB
Number of bytes in buffer, MSB
Number of bytes in buffer
Number of bytes in buffer
Number of bytes in buffer, LSB
Description
0 = The current logical position is not at BOT.
1 = The current logical position is at Beginning-of-Partition (BOT).
0 = The current logical position is not between early-warning and
end-of-tape.
1 = The current logical position is between early-warning and end-
of-tape.
0 = First Block Location and Last Block Location fields are valid.
1 = First Block Location and Last Block Location fields are invalid.
This field is always 0.
The block address of the current logical position.
The block address of the current logical position. Always the same
as First Block Location.
This field is not supported and is always 0.
This field is not supported and is always 0.
All bits are 0.
Page 85
2
1
0
BPU
Reserved
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