Omron HCG-801 - Manual (Page 23)

3. Press the SELECT button.
The message “All data in SD will be deleted. Format SD?” is displayed.
4. Press the button to select YES, then press the SELECT button.
If you press the SELECT button while NO is selected, the SD memory
card will not be formatted.
5. Press the SELECT button.
A message warning you not to remove the SD memory card while it is
being formatted is displayed and the SD memory card is formatted.
Formatting can take up to eight seconds to complete.
CAUTION: Never remove an SD memory card while
it is being formatted.
HOW TO USE THE SD MEMORY CARD
23
* By default, NO is
Highlighted.