Comment 4 for bug 152885

Your description looks suspiciously like this kernel bug:

http://bugzilla.kernel.org/show_bug.cgi?id=10808

Can you post the output from:

lsusb -v -d ????:????

(where ????:???? is the product and vendor id)

Can you try running:

blockdev --rereadpt /dev/sd?

(where ? is the block device node)

If it works, the partition nodes should appear after the partition table is reread.

T