When I got a new laptop I investigated this problem a little and found
that with hdparm -B 254/255 the temperature went up quite
significantly. This may be a freak and I would love to know whether
there really is something behind it, but when I used -B 200 the
temperature increase was clearly smaller, but the load cycle count did
not increase!!! Is this actually at all possible? Does the -B option
do something other than only affecting head loading? Does anybody
know?

In looking through the storage-fixup package data I see that always -B
254 or -B 255 is set, so obviously there is no sign of other, possibly
more optimal values there.

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