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3.1 Control/Sense Commands
C141-E167 3 -
21
Block descriptor
Pages: 3, 4
Remark
When the drive is shipped from the factory,
there are not parameter page “Save” values
except for Page 3 (Format Parameters) and
Page 4 (Drive Parameters). “Save” values for
the parameter pages specified in the MODE
SELECT command are generated for the first
time when that command is executed with “1”
specified in the “SP” bit.
MODE
SELECT
Power-on
RESET condition
TARGET RESET
message
MODE SELECT (SP=1)
Power-on
FORMAT UNIT
Power-on
RESET condition
TARGET RESET message
Block descriptor
Pages: 3, 4
[Command to
all INITs]
[Command to all INITs]
Pages:
1, 2, 7, 8, A, 1C, 21
Pages:
1, 2, 7, 8, A, C, 1C, 21
[Command to all INITs][Command to all INITs]
Default values
Save valuesCurrent values
Pages:
1, 2, 7, 8, A, C, 1C, 21
[Command to all INITs]
Figure 3.7 MODE SELECT parameter structure
The MODE SELECT parameters include parameters which can be changed by the INIT as desired,
parameters which the INIT cannot change, which whose values are determined by the IDD
unilaterally and parameters which can be changed by the INIT within certain appropriate limits. The
IDD also contains parameter fields which are applicable for rounding processing ("rounding up" or
"rounding down") of parameter values specified by the INIT to values which the IDD can use in
actual operation.
When changing of parameters other than "variable parameters" is requested by the INIT in the
MODE SELECT parameters which it transfers in this command, or when changes which are outside
the permissible range are requested, even though they are "variable parameters," this command is
terminated with a CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in
parameter list [=26-00]) and all the parameters specified by the INIT are disabled. Furthermore,
parameter fields exist which ignore the values specified by the INIT, even if the parameters are
"variable parameters." Details are explained in the description of each page descriptor in this item.