Before using an SD Card with the TD-27, it's best to format it first. Here's how:
CAUTION: Formatting an SD card in the TD-27 will permanently delete/erase any contents on the card. Be sure to transfer any important data on the card to your computer before proceeding with these Steps.
1. Turn on the TD-27.
2. Insert the SD Card into the TD-27's card slot.
3. Press the SYSTEM button.
4. Use the cursor buttons to highlight "SD CARD," and then press the ENTER button.
5. Cursor to highlight "FORMAT," and then press ENTER - "This will Clear the SD Card" appears in the display.
6. Press the function 5 button (FORMAT).
7. Cursor right once to select "OK."
8. Press ENTER.