Wikipedia
Disk partitioning or disk slicing is the creation of one or more regions on secondary storage, so that each region can be managed separately These regions are called partitions It is typically the first step of preparing a newly installed disk, before any file system is created The disk stores the information about the partitions' locations and sizes in an area known as the partition table that the operating system reads before any other part of the disk Each partition then appears to the operating system as a distinct "logical" disk that uses part of the actual disk System administrators use a program called a partition editor to create, resize, delete, and manipulate the partitions
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