Unable to copy sparse files over 4GB

Help & Support
1

I've found a new issue with sparse files. I was trying to copy some of them from an old Windows 8.1 machine to a new Windows 11 machine. Every file over 4GB would not copy, giving a "parameter is incorrect (87)" error when it reaches the 4GB mark.

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I tried:

  • Copying using DOpus on the Windows 11 machine over SMB share (NTFS on both ends).
  • Copying using DOpus on the Windows 8.1 machine to a USB flash drive (NTFS format).
  • Running chkdsk with an offline scan and repair, then trying the above again.

Eventually I tried just using Windows Explorer to copy the files, and it worked just fine.

2

Are the files still sparse after Explorer copies them?

3

Indeed the are NOT sparse after Windows Explorer copied them, a known issue with that app.

4

Can anything copy them as sparse? It may be a filesystem limitation.

(The API itself takes 64 bit size/position, so it at least should work in theory.)