Public bug reported:

Binary package hint: devicekit-disks

I have a Western Digital MyPassport 2,5" USB Hard drive. On Windows and
MacOS X, the OS spins down the disk after unmounting/ejecting.

On Ubuntu (current Karmic amd64), the disk stays up after unmounting,
and does an emergency retract (The momentum of the spindle is fed back
into the voice coil to force the heads to the landing zone). This wears
off the mechanics much faster than a normal safe poweroff.

Ubuntu should issue something like "hdparm -Y" if a disk is prepared for
safe removal.

** Affects: devicekit-disks (Ubuntu)
     Importance: Undecided
         Status: New

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External USB disk does not spin down after unmounting
https://bugs.launchpad.net/bugs/485397
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