Why is my 2GB SD card no longer works in my digital camera?

I have a Konica Minolta digital camera. My 2 GB SD card is probably about 6 months, working on my camera, but now just says "Can not use map." But the card is working on other card readers, as my printer. And no, the disc lock is on. I tried another 2 GB card in my camera and it works fine. Why not read my camera SD card? Does anyone have insightful answers or solutions to my problem?

format the card in the camera

Konica Minolta / Equitrac Express 4

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