Reference Guide

Chapter 4 SCSI Commands
READ POSITION Command (34h)
DLT-S4 Interface Reference Guide 275
Table 152 READ POSITION
(Long Form) Data — Field
Descriptions
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 field 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.
MPU Mark Position Unknown. When set to 1, indicates that the values contained in the
Logical File Identifier and Logical Set Identifier fields are not known or accurate
reporting is not currently available. When set to 0, indicates that the values these
fields contain are accurate.
LONU Logical Object Number Unknown. When set to 1, indicates that the values contained
in the Logical Object Number or Partition Number fields are not known or accurate
reporting is not currently available. When set to 0, indicates that the values these
fields contain are accurate.
Partition
Number
The partition number for the current logical position.
Logical Object
Number
The number of logical blocks between the beginning of partition and the current
logical position. Filemarks and Setmarks count as one logical block each.
Logical File
Identifier
The number of Filemarks between the beginning of partition and the current logical
position.
Logical Set
Identifier
The number of Setmarks between the beginning of partition and the current logical
position.