I just found this bugreport, and I took a look at my stats. My disk
(60GB Travelstar 7K100) accumulated ca. 300000 Load Cycle Counts over
the last 3 Years. Applying Michaels settings decreased the growth rate
massively.

One idea why disks tend to sleep longer on a Windows System: NTFS does not have 
an atime record which is updated on every read operation. I routinely mount my 
partitions with "noatime", to let them sleep longer.
And the Windows IO scheduler might by default keep disk writes cached longer, 
until a read operation has to wake up the disk anyways.

-- 
default value in power.sh potentially kills laptop disks
https://bugs.launchpad.net/bugs/59695
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