******* Working on device /dev/mirror/gm0 *******
parameters extracted from in-core disklabel are:
cylinders=30394 heads=255 sectors/track=63 (16065 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=30394 heads=255 sectors/track=63 (16065 blks/cyl)

Information from DOS bootblock is:
1: sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 63, size 488279547 (238417 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 697/ head 254/ sector 63
2: <UNUSED>
3: <UNUSED>
4: <UNUSED>