USB Format on SWF/E systems?

Can anyone tell me what is the preferred format of USB drives to be used with the SWF/E systems that use USB design loading?

I've tried:
FAT
FAT(32)
NTFS
- with various sector sizes, but no success getting the machine to read my 8 Gb thumb drive. If it has to have smaller drives than 8Gb, it's going to be tough - maybe look between the car seats, or in the bottom of a drawer at work :-(

Many thanks,
-Rich

Dixie Designs
Knoxville, TN