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Chapter 4 SCSI Commands
READ POSITION Command (34h)
DLT-S4 Interface Reference Guide
272
Table 151
READ POSITION
(Short Form) Data — Field
Descriptions
8 — 11
(MSB)
Last Logical Object Location
(LSB)
12
Reserved
13 — 15
(MSB)
Number of Logical Objects in Object Buffer
(LSB)
16 — 19
(MSB)
Number of Bytes in Object Buffer
(LSB)
Field
Description
BOP
Beginning of Partition. When set to 1, indicates that the drive is at the Beginning of
Partition (BOP) in the current partition. When set to 0, indicates that the current
logical position is not at BOP. Since DLT-S4 tape drives do not support more than
one partition, the value of this bit is 1 when at BOT.
EOP
End of Partition. When set to 1, indicates that the drive is positioned between early
warning and the End of Partition (EOP) in the current partition. When set to 0,
indicates that the current logical position is not between early warning and EOP.
LOCU
Logical Object Count Unknown. When set to 1, indicates that the value contained in
the Number of Logical Objects in Object Buffer field does not accurately represent
the actual number of logical objects in the object buffer. When set to 0, indicates that
the value contained in the Number of Logical Objects in Object Buffer field is
accurate.
BYCU
Byte Count Unknown. When set to 1, indicates that the value contained in the
Number of Bytes in Object Buffer field does not accurately represent the actual
number of bytes in the object buffer. When set to 0, indicates that the value
contained in the Number of Bytes in Object Buffer field is accurate.
Bit
7
6
5
4
3
2
1
0
Byte