Total Current Logical Position - Quantum DLT 8000 Product Manual

SCSI Commands
READ POSITION Command (34h) (continued)

5.17.2 Total Current Logical Position

When TCLP and Long bits are both set to 1, the data takes the following format:
Bit 7
Byte
0 BOP
1 - 3
(MSB)
4 - 7
(MSB)
8 - 15
(MSB)
16 - 23
(MSB)
24 - 31
Table 5–78 READ POSITION (Long Form) Data — Field Descriptions
Field Name Description
BOP Beginning of Partition. When set to 1, indicates that the logical unit is at the beginning
of partition in the current partition. When 0, indicates that the current logical position is
not at the beginning of partition. Since the tape drive does not support more than one
partition, the value of this field will be 1 when at BOT.
EOP End of Partition. When set to 1, indicates that the logical unit is positioned between early
warning and the end of partition in the current partition. When 0, it indicates that the
current logical position is not between early warning and end of partition.
MPU Mark Position Unknown. Values in File Number and Set Number are invalid.
BPU Block Position Unknown. This bit is never set: the setting of the Block Type (BT) bit of
READ POSITION's CDB does not affect the block address values returned.
Partition Partition number for the current logical position.
Number
Block Number Number of logical blocks between beginning of partition and current logical position.
Filemarks and Setmarks count as one logical block each.
File Number Number of Filemarks between beginning of partition and current logical position.
Set Number Number of Setmarks between beginning of partition and current logical position.
5-172
6 5
EOP Reserved
Figure 5–79 READ POSITION (Long Form) — Data Format
Quantum DLT 8000 Tape System
4 3
Rsv'd BPU (0)
Reserved
Partition Number
Block Number
File Number
Set Number
2 1
Reserved
0
(LSB)
(LSB)
(LSB)
(LSB)