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1) The MODE SELECT parameter is ordinarily different in its
2) After changing anything in the "Block descriptor," "Format
The configuration and functions of the "Page descriptors" supported by the IDD
are described below.
In the diagram that shows the configuration of each individual
"Page Descriptor," the default column shows that parameter's
"default" value and the "variable" column shows whether or not it is
possible to vary that parameter ("1" indicates that it can be varied).
The INIT can know those values and attributes by using the MODE
SENSE or MODE SENSE EXTENDED command.
C141-C009
configuration depending on the input/output device and the
type of controller. It is also possible that current definitions
may be expanded in accordance with the expansion of the
functions of the IDD in the future. In order to assure
independence of software from the individual specifications of
input/output devices, before the INIT issues this command, it
should follow the procedure of using the MODE SENSE and
MODE SENSE EXTENDED command to determine the types
of parameters the TARG is actually equipped with and the
attributes of those parameters, such as whether or not they can
be changed.
parameters (Page 3)" or "Drive parameters (Page 4)," with the
MODE SELECT or MODE SELECT EXTENDED command,
it is impossible to execute a command to access the data on the
disk media until execution of the FORMAT UNIT command is
completed, and a CHECK CONDITION status (MEDIUM
ERROR [=3] / Medium format corrupted [=31-00]) is reported
for all such commands.
4.1 Control/Sense Commands
4-25
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