A crc is an error check. Thats all I know; well I was supposed to write alot about em in a brief that should have been in 4 weeks ago. But I havent started :/
You've got some corrupted files in it. You should try to reformat it, then run a check on it. If some part is damaged, if it is still under warranty you should make it repaired
Sounds like a Windows f'up to me. So a reformat should cure it. The SmartMedia physical medium uses ECC for error correciton and detection (it's capable of fixing a single bit error and then marking the block bad so it isn't used again), it's only windows that uses the CRC.