What does that do?
According to the manual:
-M Get/set Automatic Acoustic Management (AAM)
setting. Most modern harddisk drives have the ability
to speed down the head movements to reduce their noise
output. The possible values are between 0 and 254. 128
is the most quiet (and therefore slowest) setting and
254 the fastest (and loudest). Some drives have only
two levels (quiet / fast), while others may have
different levels between 128 and 254. At the moment,
most drives only support 3 options, off, quiet, and
fast. These have been assigned the values 0, 128, and
254 at present, respectively, but integer space has
been incorporated for future expansion, should this
change.
the only valid numbers are 0, 128, and 254. 254 is the loudest.
--
hdd 'ticks' every 5 seconds
https://bugs.launchpad.net/bugs/140924
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