Writing ISO9660 image to non-CD media(in this case USB flash drive)

Hi,

I'm wondering how to write an ISO9660 image to a USB flash drive
partition? AFAIK the image file is just raw data, so I tried a byte-
level copy using dd to write to the flash drive partition, and then
set the partition type to CD-ROM and permissions to read-only.
However, Windows is unable to access the partition, giving an "I/O
error" message. When I view the partition properties, it shows the
file system as "RAW" instead of "CDFS".

I've also tried using a 3rd party ISO software "Undisker" to write the
iso file as binary data over to the flash partition, but got the same
result.

Does anyone know how this can be done? TIA.