I found out the cause, hdparm is not the culprit. /usr/lib/pm-
utils/power.d/harddrive from pm-utils sets most aggressive power saving
defaults; my harddrive seems to interpret the spindown setting as a
shorter duration than intended (30 s).
Marking invalid, opening new bug for pm-utils as applicable.
** Changed in: hdparm (Ubuntu)
Status: New => Invalid
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[maverick alpha] hdparm -B has no effect on hd power management
https://bugs.launchpad.net/bugs/607982
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