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Am I missing something basic or is this a bug ?

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It's not beyond the realms of possibility. Allocation block size is 4k. If every file was 5k, then they'd each take up 8k on disk, which gives 218MB.

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    To expound on that point: I had a situation with about a million or so small files, each about 1KB, which due to the block size, ended up taking up over 4 GB instead of <1 GB, on disk. – fyrepenguin Dec 11 '20 at 22:55
  • The average file size is 4660.5 bytes, which would agree with your analysis. The average allocated space for each file is 7848.7 bytes – CSM Dec 12 '20 at 11:06
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If all the files are below the allocation block size of the disk by a lot, then that could make perfect sense.

27,254 items all below an allocation block size of 8,192 bytes would lead to an "on disk" size of about 213 MB.

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    APFS block size is 4k, so you'd need file sizes to spill over the first block to reach 8k. – Tetsujin Dec 11 '20 at 7:55

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