soyokaze# fdisk -i wd0
fdisk: primarypartition table invalid, no magic in sector 0
Segmentation fault (core dumped)

My guess is the geometry along with the MBR got hosed.
Any idea on how one might go about to re-initialize this?

(gdb) bt
#0  0x0804b621 in intuit_translated_geometry ()
#1  0x0804acd6 in get_geometry ()
#2  0x080498c7 in main ()
#3  0x0804905a in ___start ()
(gdb)