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Sony - Backing up PS3? - View Post

kjj4t9rdad said:
Is your external HD formatted for FAT32? If not, the PS3 won't recognize it. If this is the case, google FAT32 formatting programs ( Compuapps Swiss Knife is what I used). The program should walk you through the formatting process. After the formatting is complete you should have no problems.
Hope this helps!

This.  Your hard drive must be formatted to Fat32 to be recognized.  I had the same issue and had to reformat