You'll need to format a USB flash drive in the TD-30 before performing a backup to it. Here's how to format it:
CAUTION: Formatting a USB flash memory drive in the TD-30 permanently erases all data on the drive. Be sure to backup any information that you want to keep to your computer before formatting.
1. Turn on the TD-30's power.
2. Insert the USB drive into the TD-30's USB memory port.
3. Press the USB MEM button.
4. Press the F5 button to select the "B" screen.
5. Press F4 (FORMAT).
6. Press F5(FORMAT) - "All Data on the USB Memory Will be Lost" appears in the display.
7. Press F5 (EXECUTE).