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       -C     Check  the  current  IDE power mode status, which will always be
              one  of  unknown  (drive  does  not   support   this   command),
              active/idle  (normal  operation), standby (low power mode, drive
              has spun down), or sleeping (lowest power mode,  drive  is  com-
              pletely shut down).  The -S, -y, -Y, and -Z flags can be used to
              manipulate the IDE power modes.


-S     Set the standby (spindown) timeout for the drive.  This value is
              used  by  the  drive to determine how long to wait (with no disk
              activity) before turning off the spindle motor  to  save  power.
              Under  such circumstances, the drive may take as long as 30 sec-
              onds to respond to a subsequent disk access, though most  drives
              are much quicker.  The encoding of the timeout value is somewhat
              peculiar.  A value of zero means "timeouts  are  disabled":  the
              device will not automatically enter standby mode.  Values from 1
              to 240 specify multiples of 5 seconds, yielding timeouts from  5
              seconds to 20 minutes.  Values from 241 to 251 specify from 1 to
              11 units of 30 minutes, yielding timeouts from 30 minutes to 5.5
              hours.   A  value  of  252  signifies a timeout of 21 minutes. A
              value of 253 sets a vendor-defined timeout period between 8  and
              12  hours, and the value 254 is reserved.  255 is interpreted as
              21 minutes plus 15 seconds.  Note that  some  older  drives  may
              have very different interpretations of these values.


-y     Force  an  IDE drive to immediately enter the low power consump-
              tion standby mode, usually causing it to spin down.  The current
              power mode status can be checked using the -C flag.

       -Y     Force  an  IDE  drive to immediately enter the lowest power con-
              sumption sleep mode, causing it to shut down completely.  A hard
              or soft reset is required before the drive can be accessed again
              (the Linux IDE driver will automatically handle issuing a  reset
              if/when  needed).   The current power mode status can be checked
              using the -C flag.