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TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE
4-98 CG00000-011503 REV. A April 1997
4-3.21 RECOVER BUFFERED DATA command 14h
RECOVER BUFFERED DATA requests that the tape unit transfer one or more blocks of data from
the tape unit’s buffer to the initiator. The command is used to retrieve data contained in the buffer
that had been sent earlier by the initiator to be written to the medium [tape]. The command is typi-
cally used following an error condition which indicates that data could not be written to the medium
[tape]. Several RECOVER BUFFERED DATA commands may be needed to retrieve all buffered
write blocks.
The Information field of sense data returned for a RECOVER BUFFERED DATA command is anal-
ogous to the Information field of sense data returned for a READ command. Please see the READ
command description in paragraph 4-3.14 on page 4-63 for a description of this field.
4-3.21.1 RECOVER BUFFERED DATA CDB Description
RECOVER BUFFERED DATA is a six-byte command. The bytes are shown below and described
in Table 4-97. Common fields are described in paragraph 4-3.1 on page 4-4.
BITS
BYTES 7 6 5 4 3 2 1 0
0
0 0 0 1 0 1 0 0
1
LUN Reserved
SILI
Fixed
2
MSB
Transfer Length
3
4
LSB
5
Reserved Flag Link
Note: Changeable fields in the CDB are shaded.
Table 4-97. RECOVER BUFFERED DATA Field Description
BYTE BIT VALUE DESCRIPTION
0 0-7 14h Operation Code.
1 0 The Fixed bit specifies both the meaning of the transfer length field and whether
fixed-length or variable-length blocks are to be transferred.
If the Fixed bit is zero, a single block is transferred with the bytes transferred being
the lesser of the actual block length or the requested transfer length.
If the Fixed bit is one, the transfer length specifies the number of blocks to be trans-
ferred to the initiator.
1 1 Suppress Incorrect Length Indication (SILI) flag.
2-4 The Transfer Length indicates the number of bytes or blocks to transfer. The block
length used is the current block length specified in the mode parameters block
descriptor (refer to the Mode Select Block Descriptor in Table 4-47 on page 4- 53.)
When the transfer length is zero, no data is transferred and the current position on
the logical unit is not changed. This condition is not considered an error.