this post was submitted on 30 May 2025
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It's A Digital Disease!

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This is a sub that aims at bringing data hoarders together to share their passion with like minded people.

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Discrepancy between size and size on disk question (zerobytes.monster)
submitted 2 months ago by bOt@zerobytes.monster to c/datahoarder@zerobytes.monster
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The original post: /r/datahoarder by /u/Platographer on 2025-05-30 02:12:49.

I have been using FreeFileSync to sync a 14 TB external HDD to a 16TB HDD of the same brand. Both are NTFS with 4KB cluster size. When comparing size through Windows Explorer, I noticed that one of my main folders has a different "size on disk" but the same size as its copy on the other hard drive. FreeFileSync says they are completely synced. In drilling down, it appears the slight discrepancy between the "size on disk" numbers comes from folders with zip files in them. How could that be possible when both HDDs are NTFS formatted with the same cluster size?

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