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usually when you can't mount a fat16 or fat32 drive read/write it's because there's errors on the drive. try running dosfsck on it and see if it works normally after that.
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You might see what dosfsck does for you also....
Thanks for the info; the forum you turned me on to has lots of good stuff on 'sudo' and 'chmod'. I'll try and enter in all kinds of experimental commands and see what happens --after all, how much harm could I possibly do to the data?