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SubjectRe: sync: why disk cannot spin down
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> Why is this even desirable?

Saves electricity - providing it is actually spinning down for a while.

> that spinning something down and then spinning it back up is what causes
> them to degrade/die. The analogy would be that a car that runs it's engine
> for 10 years straight never needs major repairs, whereas one that is
> turned on, driven, turned off, repeat, will be slowly destroyed.

Certainly old drives that ran non stop tended to die on power failures
because all the bearing wear wasnt enough to kill the disk but was enough
to ensure it wouldnt spin up again

I've never seen good reputable data on the wear patterns


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