Cannot mount / when booting from disk

[walt]

Matthew Dillon wrote:
> :
> :Francois Tigeot wrote:
> 
> :> 
> :> 	Mounting root from ufs:/dev/ad4s1a
> :> 	ad4: cannot find label (no disk label)
> :> 	ad4s1: cannot find label (no disk label)
> :> 	Root mount failed: 22

>     The most common problem is with BIOSes which try to automatically
>     recognize the operating system and then put the disk in a weird mode
>     that prevents the OS from being able to access the disk...

The reason I didn't consider this sort of thing is that I would
expect the BIOS to pull the same trick whether booting a CD or
booting from disk.  So, why should the install-CD not have the
same problem?  Same BIOS...