Important

No longer needed

Since Windows 11 24H2, Windows copy engine uses block cloning by default.

reflink for Windows

Copy file using Block Cloning, like cp --reflink.

Copy file without actual data write.

reflink <source> <destination>

source       Specifies a file to copy.
             source must have placed on the ReFS volume.
destination  Specifies new file name.
             destination must have placed on the same volume as source.

Note

Block Cloning requires ReFS v2¹.
You may check local volume by fsutil fsinfo volumeinfo or fsutil fsinfo refsinfo.

• by volumeinfo
  When Supports Block Cloning is included in fsutil output, can use Block Cloning.
• by refsinfo
  Version 1.2 or 1.1 is ReFS v1.
  Version 3.1 or upper is ReFS v2.

LICENSE

MIT License

Footnotes

1. If including non-Microsoft products, then reflink capable with WinBtrfs, OpenZFS, and so on. ↩