[9fans] Problems with the SD driver

[dante]

Dear 9ers,

I did the following (sdU0.0 is a USB stick); the machine being a 
Raspberry Pi:

disk/mbr /dev/sdU0.0/data
disk/fdisk -b /dev/sdU0.0/data <<EOF
a p0 0 32
t p0 FAT32
A p0
w
q
EOF
disk/fdisk -wa /dev/sdU0.0/data
disk/fdisk -p /dev/sdU0.0/data >/dev/sdU0.0/ctl

Now, I would expect to find entries for the dos and plan9 partitions 
under /dev/sdU0.0.
All there is there are the following files: ctl, data, raw.

What's going wrong?

Thanks,
Dante