Quentin Garnier wrote in
http://mail-index.netbsd.org/netbsd-users/2005/03/04/0002.html

> How does mount fail, exactly?

At least one mp3 player and at least one photo camera
exist whose FAT16 starts at sector 0.

Since there is no mbr sector, it is not possible to
mount_msdos(8) the fs directly.

A workaround is to dump the entire sd0d to a file,
prepend a few blank sectors and make a fake mbr.