Dependant on what you're trying to do, you may find it easier to copy the data 
to a new partition, then re-build the MBR if you need GRUB etc. I don't know 
if this will work on a FAT16/32/NTFS partition, but for all things Linux 
(including the linux root file system) "cp -av <whatever> <wherever>" works 
wonders. I have used it to move cluster node root FSes from loop-mounted 
images to NFS shares.
You can also use tar to do the same job, which is useful if you need to go via 
another file-system.
Hope this helps,
Tim B.
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