bmaptool

Create or copy block maps intelligently (designed to be faster than `cp` or `dd`).
More information.
bmaptool create -o {blockmap.bmap} {source.img}
bmaptool copy --bmap {blockmap.bmap} {source.img} {/dev/sdb}
bmaptool copy --bmap {blockmap.bmap} {source.img.gz} {/dev/sdb}
bmaptool copy --nobmap {source.img} {/dev/sdb}
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