Read Extended Command (28 H ) - Seagate MEDALIST 1080SL Product Manual

54 Medalist 1080sl SCSI Product Manual, August 1995
of the last logical block address, after which a substantial
delay (approximately 1 msec) in data transfer occurs. This
logical block address must be greater than or equal to the
logical block address specified in the CDB. This reported
logical block address is a cylinder boundary.
3.5.1.1 Read Capacity data
The Read Capacity data is shown below.
Bytes
7 6
0–3
4–7
Bytes 0–3 The logical block address is determined by the PMI bit in
the CDB of the Read Capacity command. The PMI bit is
described in Section 3.5.1.
Bytes 4–7 The block length is always 512.
3.5.2 Read Extended command (28
When the drive receives the Read Extended command, it transfers data
to the initiator. This command is the same as the Read command
discussed in Section 3.4.6, except that in the CDB for the Read Extended
command, a 4-byte logical block address and a 2-byte transfer length
can be specified.
If there is a reservation access conflict, this command terminates with a
reservation conflict status and no data is read. For more information
about the reservation conflict status, see Section 3.2.
Bits
5 4 3 2
Logical block address
Block length (00000200 )
H
)
H
1 0