Can anyone help me reformatting my iPod with two GUID partitions? Every time I try and format it using Disk Utility, I get the very informative error: "Input/Output Error" I've tried a few other pieces of partitioning software but I always end up with it failing with useless error messages. Is there something inherent in the iPod that stops you formatting as GUID? Thanks P.S. iPartition gives the error "Partition map failed to write back to the cache" if that helps with anything.