Spin down HDD after disk sync or before power off

[Joerg Sonnenberger]

On Thu, Mar 05, 2009 at 08:58:50AM +0100, Oliver Fromme wrote:
>  > This is not true. Many hard disks don't like having to do an emergency
>  > shutdown as it affects the disk life time negatively. That's what
>  > happens if you poweroff the machine when the disks are still spinning.
> 
> Can you point to any authoritative information (URL) about
> that claim, such as vendor specs, white paper or similar?

Not without digging. NetBSD PR 21531 had a reference, but that is dead
nowadays.

Joerg