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APFS uses 400G more space than NTFS

I have 3.5 TB video files on NTFS, I recently bought an external SSD and format as APFS; I copied (use goodsync to sync the files, so it is same) from NTFS to this APFS drive. (Without any other single file). On APFS it takes like 3.9TB.

It uses 400G more space than NTFS, why?

Looks like the Samsung T7 4TB format as APFS only 3.6TB, not sure why:

$ df -h|grep t7

/dev/disk5s1 3.6Ti 3.5Ti 94Gi 98% 7940 983155080 0% /Volumes/t7

$ df -H|grep t7

/dev/disk5s1 4.0T 3.9T 101G 98% 7940 983155080 0% /Volumes/t7

iMac (2017 – 2020)

Posted on May 30, 2023 6:58 PM

Top-ranking reply

Luis Sequeira1

Level 9

67,594 points

Posted on May 31, 2023 3:35 AM

Notice the "T" vs "Ti", and "G" bs "Gi"?

T is 10^12 or 1,000,000,000,000

whereas Ti is 2^40, which is 1,099,511,627,776

Likewise,

G is 10^9 or 1,000,000,000

Gi is 2^30 or 1,073,741,824

so the "units" in each case are not exactly the same.

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APFS uses 400G more space than NTFS

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