WinDirStat reporting wrong size for dedupped files.

avogelba / WinDirStats

WinDirStats - Windows Directory Statistics, private clone from:

https://bitbucket.org/windirstat/windirstat

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WinDirStat reporting wrong size for dedupped files. #120

Closed avogelba closed 6 years ago

avogelba commented 9 years ago

Originally reported by: Anonymous

It seems as if the program is reporting dedupped files to be size 0 kb.

Please see enclosed png.

Bitbucket: https://bitbucket.org/windirstat/windirstat/issue/120

avogelba commented 9 years ago

Original comment by Oliver (Bitbucket: assarbad, GitHub: assarbad):

This is, in fact, correct.

Deduplication on modern Windows versions is based on reparse points. This means that the deduplicated item is a mere reference to the original data. But it's not but not a hardlink. Hardlinks are directory entries pointing to the same NTFS record. Reparse points on the other hand have their own NTFS records and therefore this data is conclusive.