Problem with reboot and SATA Drive or not?

[loopb]

I have (i think soo) one problem.

When i am trying to reboot system:

- system says hes closeing

- in the same time he turns off my hdd

- (restart)

- turns on my hdd again (on POST)

i have this situation first time on reboot...

i don't know if this a drive problem (of integrated nforce driver) or the system. mayby it's ok?

Please answer.

loopb