[!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. ↩