What is the allocation unit size in the filesystem? AFAIK for exFAT it can be even 32 MiB. If you had e.g. 60,000 relatively small files and you lost about 30 MiB per each, then the difference between the total size on disk and the total size would be about 1800 GiB. So yes, the difference you observed is possible and normal, if the allocation unit size is that big and so many files are that small. Now the question is: is this the case here?
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