GNU Parted
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GNU Parted is a program for creating, destroying, resizing, checking and copying partitions, and the file systems on them. This is useful for creating space for new operating systems, reorganising disk usage, copying data between hard disks and disk imaging.
GNU Parted can be found on http://ftp.gnu.org/gnu/parted/ or one of the mirrors.
Currently, Parted only runs under GNU/Linux. If you don't have GNU/Linux, then a boot disk image is available on all mirrors in the /gnu/parted/bootdisk directory.