Table of Contents
Advertisement
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
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.
4 - 20
IMPORTANT
IMPORTANT
C141-E054-02EN
Advertisement
Table of Contents
