[Bug 875719] Re: hdparm does not spin down hard disk on inactivity timeout

[Wojciech Musial]

You may want to consider hd-idle as a workaround. It checks for
read/write activity and spins the drive down a la hdparm -Y after a
specified timeout.

http://hd-idle.sourceforge.net/

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https://bugs.launchpad.net/bugs/875719

Title:
  hdparm does not spin down hard disk on inactivity timeout

Status in hdparm package in Ubuntu:
  Confirmed

Bug description:
  First off, I'd like to mention that hdparm -S worked with 10.10. But
  with 11.04 my external hard disk (Seagate) connected via eSATA
  ExpressCard on a ThinkPad X200s doesn't spin down anymore on
  inactivity timeout set to 12 (1 minute). I'm still able to spin down
  the disk with the -y option---but a few seconds later it spins up
  again. This hard disk is my backup disk and only in use every 4 hours
  by a cron job.

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