Linux/Ubuntu2017.05.23 15:32

$ sudo hdparm -S 값 장치명

1~240 / 5초 (5초 ~ 20분)

241~251 / 30분 (30분 ~ 5시간 30분)

252 / 21분?

253 / 업체별 상이 (8~ 12시간)

254 / reserved

255 / 21분 15초

 -S Put the drive into idle (low-power) mode, and also set the

              standby (spindown) timeout for the drive. This timeout 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
              seconds  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.

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Posted by 구차니

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