Windows calls the driver CDFS, the file system is called ISO 9660.
Years ago on Win2000, I copied an ISO image to disk with and without partition.
Windows will not recognize it, by design I suppose.

Are you sure Sandisk uses a partition? USB devices can be multiple drives.

wrote in message
news:75c2b31e-5ab3-4768-be7d-e76063e981bd@d42g2000prb.googlegroups.com...
> Does anyone know how to partition a usb drive to CDFS? I researched a
> lot and cannot find anything helpful. I have yet to see anyone who
> has been successful in doing this. I know scandisk U3 drives have
> this partition. Any ideas? I have tried using various programs in
> dos, windows, mac, and linux.
> Thanks

Previously kcajmc@gmail.com wrote:
> Does anyone know how to partition a usb drive to CDFS? I researched a
> lot and cannot find anything helpful. I have yet to see anyone who
> has been successful in doing this. I know scandisk U3 drives have
> this partition. Any ideas? I have tried using various programs in
> dos, windows, mac, and linux.
> Thanks

What is CDFS? Maybe iso9660? You cannot partition to that, as it
is a whole-disk filesystem that does not support partitions.
You can put an iso9660 image into a partition or on a whole drive
simply by copying it there, e.g. by (Linux)

cat image.iso > /dev/

Use mkisofs (Linux) to create the iso image or create a CD image
with any application that can do so.

Arno