SCSI Commands
5-172
Quantum DLT 8000 Tape System
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
Byte
7
6
5
4
3
2
1
0
0
BOP
EOP
Reserved
Rsv’d
BPU (0)
Reserved
1 - 3
Reserved
4 - 7
(MSB)
Partition Number
(LSB)
8 - 15
(MSB)
Block Number
(LSB)
16 - 23
(MSB)
File Number
(LSB)
24 - 31
(MSB)
Set Number
(LSB)
Figure 5–79 READ POSITION (Long Form) — Data Format
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
Number
Partition number for the current logical position.
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.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
Page 6: ......
Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
Page 102: ......
Page 372: ......
Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
Page 407: ......