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Command Specifications
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 HDD 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" 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.
Chapter 5 describes the configuration and functions of the "Parameter data format"
supported by the HDD.
162 C141-C013