ad0: 1946MB <TOSHIBA THNCF2G04QG 3.00> at ata0-master PIO4
Trying to mount root from ufs:/dev/da0

Manual root filesystem specification:
  <fstype>:<device>  Mount <device> using filesystem <fstype>
                       eg. ufs:da0s1a
  ?                  List valid disk boot devices
  <empty line>       Abort manual input

mountroot>