Datasheet

Command Specifications
4-136 C141-C008
When the specifications in the "Logical block address" field and "Transfer block
count" field in the CDB exceed the maximum logical block address in the IDD,
that command is terminated with a CHECK CONDITION status (ILLEGAL
REQUEST [=5] / Logical block address out of range [=21-00]) and the reading of
data from the disk media is not executed.
Error recovery processing during execution of this command can be specified by
the MODE SELECT parameter. If retry processing and data correction
processing are not prohibited, when this command is completed normally, or
when it is completed with a "RECOVERED ERROR [=1]" sense key report, the
data transferred to the INIT by this command are error free. When a correctable
error check is detected, the IDD first corrects the data errors in the data buffer,
then transfers those data to the INIT.
The starting timing for Loop OPEN processing in order to execute data transfer
on the FC bus can be specified by the MODE SELECT parameter (buffer full
ratio). Also, if the Look-Ahead cache feature is permitted, a caching operation is
performed using the IDD's data buffer by this command. See Chapter 3, "Data
Buffer Management," concerning details of data buffer operation and the Look-
Ahead cache feature.
4.2.2 READ EXTENDED (28)
Bit
Byte
7 6 5 4 3 2 1 0
0 X‘28’
1 0 0 0
×
FUA 0 0 0
2 Logical Block Address (MSB)
3 Logical Block Address
4 Logical Block Address
5 Logical Block Address (LSB)
6 0 0 0 0 0 0 0 0
7 Transfer Block Count (MSB)
8 Transfer Block Count (LSB)
9 0 0 0 0 0 0 0 0
This command reads the number of blocks of data in continuous logical data
blocks specified in the "Transfer block count" field with the logical data block on
the disk media specified in the "Logical block address" field in the CDB as the
top.