An important bug picked up for the Ubuntu laptop users here:
Quote:
When switching to battery power, /etc/acpi/power.sh issues the command hdparm -B 1 to all block devices. This leads to extremely frequent load cycles. For example, my new thinkpad has already done well over 7000 load cycles -- in only 100 hours. That's at least one unloading per minute. Googling for "load unload cycles notebook OR laptop" shows that most laptop drives handle up to 600,000 such cycles.
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Confirmed also with my Hitachi HTS541210H9SA00 (which has used up 10% of its life in less than a month  ).
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There's instructions on how to change the default values. It only affects laptops because it happens when switching to battery mode.