The second main unit is a cluster. Cluster is a logical unit of data storage in the file allocation table used by certain types of file systems. Cluster is a logical unit of data storage in the file allocation table used by certain types of file systems. Clusters were introduced because the size of the FAT was limited and the disk size used to change. In case of FAT16 for a disk of 512 MB, a cluster will be 8 KB; up to 1GB – 16 KB; up to 2 GB – 32 KB, etc.
Generally it is the least disk space used for file storage.
The concept of cluster is used by FAT and NTFS file systems. Other file systems operate some similar concepts (zones in Minix, blocks in Unix).
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