$ 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. |
[링크 : http://manpages.ubuntu.com/manpages/zesty/en/man8/hdparm.8.html]
[링크 : https://askubuntu.com/questions/39760/how-can-i-control-hdd-spin-down-time]
[링크 : http://www.spencerstirling.com/computergeek/powersaving.html]
[링크 : https://wiki.archlinux.org/index.php/Power_management]
[링크 : https://wiki.archlinux.org/index.php/Hdparm#Power_management_configuration]
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