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SCSI Commands Reference Manual, Rev. J 113
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.11.1.3 Default values
A PC field value of 10b requests that the device server return the default values of the mode parameters. Unsupported
parameters shall be set to zero. Default values should be accessible even if the logical unit is not ready.
3.11.1.4 Saved values
A PC field value of 11b requests that the device server return the saved values of the mode parameters. Mode parameters not
supported by the logical unit shall be set to zero. If saved values are not implemented, the command shall be terminated with
CHECK CONDITION status, with the sense key set to ILLEGAL REQUEST, and the additional sense code set to SAVING
PARAMETERS NOT SUPPORTED.
The method of saving parameters is vendor specific. The parameters are preserved in such a manner that they are retained when
the device is powered down. All saveable mode pages should be considered saved when a MODE SELECT command issued with
the SP bit set to one has returned a GOOD status or after the successful completion of a FORMAT UNIT command.
3.11.1.5 Initial responses
After a logical unit reset, the device server shall respond in the following manner:
a) If default values are requested, report the default values;
b) If saved values are requested, report valid restored mode parameters, or restore the mode parameters and report them. If
the saved values of the mode parameters are not able to be accessed from the nonvolatile vendor specific location, the
command shall be terminated with CHECK CONDITION status, with the sense key set to NOT READY. If saved parameters
are not implemented, respond as defined in 3.11.1.4; or
c) If current values are requested and the current values have been sent by the application client via a MODE SELECT com-
mand, the current values shall be returned. If the current values have not been sent, the device server shall return:
a) The saved values, if saving is implemented and saved values are available; or
b) The default values.