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4.1.4
MODE SELECT (15)
Bit
7
Byte
0
1
0
2
0
3
0
4
5
0
This command performs setting and changing of each type of parameter related to disk drive
physical attributes, data format, timing of FC interface transferring processing and error
recovery procedures, etc. The INIT can know the types of parameters, the current settings of
each parameter and the types of parameters which can be changed, and the ranges for such
changes, etc. by using the MODE SENSE or MODE SENSE EXTENDED command.
This command can be executed even when "FORMAT failure" is recorded in the SA
information.
The data (MODE SELECT parameters) transferred from the INIT to the IDD by this
command, are configured from a "Header," "Block Descriptor" and one or more "Page
Descriptors" which describe each parameter, each of which will be explained later.
When the "PF (page format)" bit in CDB byte 1 is "1," it indicates that the MODE SELECT
parameters transferred from the INIT by this command are in the "Page Descriptor" format. The
IDD disregards the value specified in this bit and regards the MODE SELECT parameters
transferred from the INIT as being in the "Page Descriptor" format and executes this command.
The "SP (save pages)" bit in CDB byte 1 specifies whether or not to save the MODE SELECT
parameters specified in this command on the disk. It is possible for the IDD to save all the
MODE SELECT parameters described in the "Page Descriptor" (except for those on page C),
but this bit's specification is valid only for parameters other than "Format parameters (Page 3)"
and "Drive parameters (Page 4: excluding byte 17)."
If "1" is specified in the "SP" bit, the parameters transferred from the INIT are saved to the
disk when this command is executed, except for "Format parameters (page 3)" and "Drive
parameters (Page 4: excluding byte 17)." When the "SP" bit is "0," these parameters are not
saved to the disk. On the other hand, as for "Format parameters (Page 3)" and "Drive
parameters (Page 4: excluding byte 17)," regardless of the specification of the "SP" bit when
this command is executed, these parameters are always saved to the disk when the FORMAT
UNIT command is executed.
4 - 12
6
5
4
0
0
PF
0
0
0
0
0
0
Parameter List Length
0
0
0
C141-E054-02EN
3
2
X'15'
0
0
0
0
0
0
0
0
1
0
0
SP
0
0
0
0
0
0
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