Can't access my partitions any more

[prost]

I can use ext3 but not fat32 partitions. I'm using knoppix 5.1.1

Also, when I plugged in my new portable mp3 player, nothing happened. It does contain sample mp3's. Does it need formatting? If so how?
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Info on installing digital cameras/zip drives can be found here
http://www.elearnit.de/knoppix/docs/tutorial/english/knoppix_configuration.html#9