3Com TRGpro - Manual (Page 208)

Page 200 CompactFlash™, CFpro™, and CFBackup™
fingernail recess and pulling the door off.
3. Press your thumb against the outer edge of the CF memory card
and slowly draw the card from the slot.
4. Replace the card expansion slot door by positioning the two tabs in
the slot groove and pressing onto the fingernail recess to push the
door locked.
Make sure you take precautions when handling a CF card. Never
remove a card while your handheld computer is accessing it. Don't
store the card near magnetic fields or electrostatic sources.