yo.
If you escape to loader prompt on the live cd and type 'boot -v' to get a
verbose boot, this happens:
....
Mounting root from cd9660:/dev/adc0a
tryroot acd0a
no disk named 'acd0a'
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6
<manual root filesystem specification>
Max