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C141-E124-01EN 3 - 29
Notes:
1. The MODE SELECT parameter is ordinarily different in its 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.
2. After changing anything in the "Block descriptor," "Format 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.
The configuration and functions of the "Page descriptors" supported by the IDD are described in
Section 4.1.
Note:
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.