Spectra Logic Spectra 12K User Manual page 144

Table A-19: Segment Descriptor for Code 05h
Bit
Byte 7
12 (MSB)
13
14
15
The Destination Device Transfer Length specifies the amount of data to be written to
the destination stream device on each write operation. See Table A-A-12 on page 134
for information on how the segment descriptor Device Transfer Length interacts with
the Tape Block Length Parameter of the device-specific information.
The Number of Bytes field specifies the number of bytes of embedded data that are to
be transferred to the stream device. The embedded data directly follows the segment
descriptor.
Embedded data must begin on a four-byte boundary and must be padded up to a four-
byte boundary to ensure that any following segment descriptor are aligned to a four-
byte boundary. The Number of Bytes field indicates the actual data length, not
including any PAD bytes.
If the amount of data specified in the Number of Bytes fields exceeds the amount of
data provided, then the copy manager terminates the command with a CHECK CONDITION.
The Sense Key is set COPY ABORTED, and the ASC and ASCQ indicate DATA UNDERRUN.
6 5 4
Number of Bytes
Embedded Data
144
.
3 2 1 0
(LSB)