W. Wayne Liauh wrote:
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Partition Image will only copy data from the used portions of the partition. For speed and efficiency, free blocks are not written to the image file. This is unlike the 'dd' command, which also copies empty blocks. Partition Image also works for large, very full partitions. For example, a full 1 GB partition can be compressed with gzip down to 400MB.

BZIP2 and GZIP both compress null data pretty well. The problem that arises is that often, this "free space" isn't really blank, just marked "unused". A solution I've seen to this is to use a resize program to resize the image down to the minimum size it can be once the image is taken.

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--MonMotha

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