I have a second hard drive in APFS with the data from my first drive, which is in exFAT. Now the data on the APFS is smaller, but the amount is the same. Is it compressed, or what's wrong? Please help.
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File systems work with clusters. A cluster is a certain number of sectors. For NTFS, for example, 4KB are the most common attitude. This means that a file is stored in 4KB blocks.
If a file now needs 4,1KB storage space, fills 2 clusters and 8 KB. 3.9 KB that are wasted are called Slack-Space.
Thus, the cluster size depends on whether a file has quite little or relatively much slack space. The larger the clusters the more memory is potentially wasted.
How big is the difference between the files?
PS.: APFS supports various things like compression, but whether they are already active or whether you have activated them, I cannot say from here.
APFS also supports deduplication – this may also be a reason. It might be useful to generate the file listing with the terminal:
This would then tell us if the smaller files are only links to a file…