I bought a 6TB (5.45TB usable) to transfer my 3TB drive.
I used robocopy source destination
/MIR /R:0 /W:0 /xo
Robocopy reports that 2.228TB were copied, but I only have 1.18TB left available out of the 5.45TB.
My 3TB is drive is NTFS, and my 6TB is exFAT, but I don't tink that it matters.
I tried “Disk cleanup” and “Clean up system files” but both report nothing to clean.
Why am I missing so much space and how to retrieve it?