Hard drives are divided up into partitions, which can be in FAT16, FAT32 or NTFS format. Files in the partition are stored in clusters.

A file's size can be smaller than a cluster but still it uses a cluster . Therefore always a portion of disk is wasted.

The number of clusters a file uses can be figured using this formula: File Size / Cluster Size, rounded up. For example, a 20,000 byte file on a partition with 4,096 byte clusters would use 5 clusters becuase 20000 / 4096 = 4.8, rounded = 5.

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