A group of sectors on a disk. A sector is a small piece that can be accessed on your memory hard disk in the same way a cluster is a vaguely larger unit that is used to arrange and recognize files on the disk. Most files acquire up several clusters of disk space.

Each cluster has a exclusive ID, which enables the hard drive to position all the clusters on the disk. The computer clustering approach usually (but not always) connects a number of readily available computing nodes (e.g. personal computers used as servers) via a fast local area network.

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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.