Reference Guide

Chapter 4 SCSI Commands
READ POSITION Command (34h)
DLT-S4 Interface Reference Guide 273
LOLU Logical Object Location Unknown. When set to 1, indicates that the values contained
in the Partition Number, First Logical Object Location, or Last Logical Object
Location fields are not known or accurate reporting is not currently available. When
set to 0, indicates that the values these fields contain are accurate.
PERR Position Error. When set to 1, indicates that the drive is unable to report the correct
position as a result of an overflow in any of the returned positional data fields.
When set to 0, indicates that there were no overflow conditions in any of the
returned positional data fields.
Partition
Number
The partition number for the current logical position.
First Logical
Object Location
The block address associated with the current logical position; the next block to be
transferred between the target and initiator if a
READ or WRITE command is issued.
Last Logical
Object Location
The block address associated with the current physical position; the next block to be
transferred to tape medium from the drive’s buffer. If the buffer is empty, or has
only a partial block, the same value as First Block Location is reported. The first
block or filemark written onto the tape medium is at address 0.
Number of
Logical Objects
in Object Buffer
The number of data blocks in the drive’s buffer that have not been written to the
tape medium.
Number of Bytes
in Object Buffer
The number of data bytes in the drive’s buffer that have not been written to the tape
medium.
Field Description