Is hard drive spindown functionality broken?

[Yuri]

Last night I ran the command:
atacontrol spindown ad10 60
on my desktop and similar one on my laptop.

In the morning I found that laptop rebooted overnight, and desktop was 
still functional, but I suddenly got flooded with the message:
fwohci0: device physically ejected?
then system froze. I never use anything related to fwohci.

Does anybody use spindown? What might be the problem?

Yuri