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4.1 Control/Sense Commands
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
MODE SELECT (SP=1)
Power-on
FORMAT UNIT
Power-on
RESET condition
Block descriptor
Pages: 3, 4
[Command to
all INITs]
[Command to all INITs]
Pages:
1, 2, 7, 8, A, 19, 1C,
1A, 21
Pages:
1, 2, 7, 8, A, C, 19, 1C,
1A, 21
[Command to all INITs][Command to all INITs]
Default values
Save values Current values
Pages:
1, 2, 7, 8, A, C, 19, 1C,
1A, 21
[Command to all INITs]
Figure 4.1 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 HDD unilaterally and parameters which can be changed by
the INIT within certain appropriate limits. The HDD 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 HDD 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.
C141-C013 155