Try searching your desktop for 'Creating and Formatting Partitions'
Then see if your flash drive is listed. I've had the best luck on Fanuc controls when you format a single partition to 256MB with the name 'FANUC LTD' as FAT16. I know it's a waste of the rest of the card's memory, but it hasn't given me any problems even when doing SRAM backups.
If you still can't see it on your computer, you might have driver problems or a bad card or reader.