Vincenzo, `sudo hdparm -I /dev/sda' and look for the line like

    Advanced power management level: 64

Some drives don't have `Advanced Power Management feature set' in their
`Commands/features' list that's also in -I's output so you won't see a
reading for it.

-- 
High frequency of load/unload cycles on some hard disks may shorten lifetime
https://bugs.launchpad.net/bugs/59695
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