The remaining unused sectors in the partially used cluster remain unchanged and keep the bytes they had before, which can be parts of a previously deleted file in this location.For whatever reason, Windows decides to pick a random sequence from RAM to fill this sector. Windows always writes 512 byte blocks at once, so the first only partially used sector must get filled up before being written to disk.Large files get split over multiple clusters, when the remainder of a file does not fill an entire cluster, this remaining unused space at the end of the cluster is called "file slack".A cluster usually contains 8 sectors of 512 bytes each, so 4096 bytes or 4kiB.
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