Command Descriptor Block; Table 11-1: Locate Command Descriptor Block - Tandberg Data SLR7-140 PROGRAMMER Manual

BYTE BIT 7
00 Operation Code 2Bh
01 Logical Unit Number (LUN)
02 RESERVED
03 Block Address
04
05
06
07 RESERVED
08 Partition
09 Control Byte
Table 11-1:
BT
CP
IMM
Block Address
Partition
Tandberg Data

11.2. Command Descriptor Block

6 5
LOCATE Command Descriptor Block
When the Block address Type (BT) bit is cleared, the
Block Address field in the CDB will be the logical block
identifier for the LOCATE operation. If the BT bit is
set, the Block Address field in the CDB will be the
physical block identifier.
When using SLRtape140 to SLRtape7 or SLR32, media, the
BT bit must be set to zero. On the SLR140, SLR100,
SLR75, SLR60 and SLR7 drives the BT bit must always be
set to zero.
supported.
A change partition (CP) bit of one indicates that a
change to the partition specified in the Partition field
is to occur prior to positioning to the physical block
specified in the Block Address field. A CP bit of one is
only valid when using SLRtape140 to SLRtape7 or SLR32,
media. A CP bit of zero indicates that no partition
change is to be made and the Partition field is to be
ignored.
The drive does not support immediate operations on this
command. The immediate (IMM) bit must be set to zero.
The input to the LOCATE command can be either physical
or logical block identifiers. After a successful command
execution, the logical tape position will be located
before the specified block (beginning-of-media side).
A LOCATE to the block address one greater than the last
block in the partition will return GOOD status. A LOCATE
to a block more than 1 block beyond the last block in
the partition will
section on Exception Handling below).
The partition field specifies which partition to select
if the CP bit is one. The Drive can have up to 36
partitions. See section 2.3 Partitions Within a Volume
for information on how to use partitions.
11-2 Tandberg SLR Product Line SCSI Functional Specifications
4 3
RESERVED
Only logical block
return CHECK
Locate
2 1
BT CP IMM
identifiers
CONDITION (see
0
are
the