[6.3] ALT-CTRL-DEL = clean unmount?

[Lokadamus]

Gilles wrote:
> I was wondering: When hitting the ALT-CTRL-DEL combination as an easy
> way to call "reboot", does this unmount disks properly?
>
> ad0: DMA limited to UDMA33, controller found non-ATA66 cable
> ad0: 19092MB <Seagate ST320413A 3.39> at ata0-master UDMA3
>   
Can you change your IDE- Cable from ATA- 33 to ATA-66/100?

Have you this error, when you make a reboot with shutdown -r now?