Help! How to get back to a clean device?

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http://www.mobileread.com – This morning, I connected my Samsung Galaxy Player 5.0 to my computer to transfer a few files. Upon copying some 600kb of HTML files to the device, the attempt hung. I could not cancel, I could not eject the drives, I just had a spinning circle that wouldn't quit. I couldn't disconnect from the player side either. I shut down the computer, disconnected the device, and upon restart, had an "SD card damaged" message. The catch is that I don't know for sure what is damaged, whether it is the external SD card (Lexar 16GB) or the internal SD card. The external SD card showed as not mo (HowTos)