Thanks marc, that helped.
It turned out that I also needed to add some nodes to the filesystem;
@sda,b,8,0
@sda1,b,8,1
Hopefully I got this correct?
So, now when I mount the USB partition I get
mount -n -t vfat /dev/sda1 /mnt/usb
FAT: codepage cp437 not found
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
or too many mounted file systems#
What could cause "FAT: codepage cp437 not found" ?
I believe that the formatting is correct;
Disk /dev/sda: 65 MB, 65011712 bytes
2 heads, 62 sectors/track, 1024 cylinders
Units = cylinders of 124 * 512 = 63488 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 1024 63457 b Win95 FAT32