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bmaptool — Create or copy block maps intelligently (designed to be faster than `cp` or `dd`). More information:

Submitted by: @import:tldr-pages·Mar 2, 2026·

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createintelligentlycommandcopybmaptoolcliblockmaps

Problem

How to use the bmaptool command: Create or copy block maps intelligently (designed to be faster than cp or dd). More information: <https://manned.org/bmaptool>.

Solution

bmaptool — Create or copy block maps intelligently (designed to be faster than cp or dd). More information: <https://manned.org/bmaptool>.

Output a blockmap file from image file:

bmaptool create {{[-o|--output]}} {{blockmap.bmap}} {{source.img}}

Copy an image file into sdb:

bmaptool copy --bmap {{blockmap.bmap}} {{source.img}} {{/dev/sdb}}

Copy a compressed image file into sdb:

bmaptool copy --bmap {{blockmap.bmap}} {{source.img.gz}} {{/dev/sdb}}

Copy an image file into sdb without using a blockmap:

bmaptool copy --nobmap {{source.img}} {{/dev/sdb}}

Code Snippets

Output a blockmap file from image file

bmaptool create {{[-o|--output]}} {{blockmap.bmap}} {{source.img}}

Copy an image file into sdb

bmaptool copy --bmap {{blockmap.bmap}} {{source.img}} {{/dev/sdb}}

Copy a compressed image file into sdb

bmaptool copy --bmap {{blockmap.bmap}} {{source.img.gz}} {{/dev/sdb}}

Copy an image file into sdb without using a blockmap

bmaptool copy --nobmap {{source.img}} {{/dev/sdb}}

Context

tldr-pages: common/bmaptool

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