ClusterIn data storage, the smallest amount of disk space that can be allocated to hold a file. All file
systems used by Windows organize hard disks based on clusters, which consist of one or more contiguous
sectors. The smaller the cluster size, the more efficiently a disk stores information. If no cluster size is
specified during formatting, Windows picks defaults based on the size of the volume. These defaults are
selected to reduce the amount of space that is lost and the amount of fragmentation on the volume. Also
called an allocation unit.
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