I suggest you save the file off the USB drive to your computers C drive. Your computer can write\read files much!! faster using the C drive than it can from a slower USB drive. Then when you have what you want save the file back to the USB drive.

My "guess" no another USB dive will not help. It would only help if the one you currently have is bad.

If you have a owners book or Help available for the FD look up "formats". See what kind of formats it will save data in. With my Line 6 I can save data in 4 or 5 different formats to a SD card. I bet the FD does also, so that Windows or Mac or Linux users can also use the FD product.