In computeroperating systems, disk partitioning is the creation of logical divisions upon a hard disk that allows one to apply operating system-specific logical formatting. In layman's terms, partitioning a hard drive can make it behave like multiple, independent non-partitioned hard drives for most practical purposes; the main difference with separate hard disks is that partitions of the same hard disk share their hardware (and therefore hardware failures) and it is possible to resize existing partitions.
See more at Wikipedia.org...