Konica Minolta X21 User Manual (en)

The response time during recording and playback is longer with MultiMediaCards
compared with SD Memory Cards. This is not a defect, but rather due to the
specifications of the cards. When using large capacity cards, some operations like
deletion may take longer. 
The SD Memory Card has a write-protect switch to
prevent image data from being deleted. By sliding the
switch to the bottom of the card, the data will be
protected. However, when the card is protected, images
cannot be recorded. If an attempt is made to record or
delete an image with the camera, the card-locked
message will appear and the LED lamp near the card
slot will turn red and blink quickly. For memory card care
and store see page 108.
If the unable-to-use-card message appears, the
inserted card in the camera may need to be formatted.
A card used in another camera may also have to be
formatted before being used. A card can be formatted in
section 1 of the setup menu (p. 82). When a card is
formatted, all the data on the card is permanently