Read Command (08H) - Quantum DLT 8000 Product Manual

SCSI Commands

5.14 READ Command (08h)

This command transfers one or more data blocks or bytes to the initiator starting with
the next block on the tape.
Bit 7
Byte
0
1 Logical Unit Number
(MSB)
2 - 4
5 Unused
Figure 5–71 READ Command Descriptor Block — Data Format
Table 5–72 READ Command Descriptor Block — Field Descriptions
Field Name
SILI
5-160
6 5
Operation Code (08h)
Transfer Length
Description
Suppress Incorrect Length Indicator. If the SILI bit is set to 1 and the
Fixed bit is set to 1, the target terminates the command with CHECK
CONDITION status, sense key set to ILLEGAL REQUEST, and additional
sense code of INVALID FIELD IN CDB.
If the SILI bit is 0 and the actual block length is different than the
specified transfer length, a CHECK CONDITION status is returned.
Within the sense data, the Incorrect Length Indicator (ILI) bit and
Valid bit will be set to 1. The sense key field specifies NO SENSE. The
information bytes are set to the difference (residue) between the
requested transfer length and the actual block length., or, in Fixed
Block mode, the difference (residue) between the requested number
of blocks and the actual number of blocks read. No more than
transfer length blocks are transferred to the initiator and the tape is
logically positioned after the block (EOM side).
Quantum DLT 8000 Tape System
4 3
Reserved
Reserved
2 1
SILI Fixed
Flag Link
0
(LSB)