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It allows you to store your files in a different partition and the operating system files in a different partition.
Partitioning helps increase the read-write speed of the hard disk.
You can customize each partition as per your need.
DOS lets you create two types of partitions namely the primary partition and the extended partition. The first partition you create is the physical disk which is called primary partition and the drive name assigned to it is always C. Any other partition you create after this is called extended partitions. Logical drives exist in extended partitions and they are assigned drive letters from D-Z. 
You need to run a utility called FDISK, which is normally located in the boot disk to create partitions. In case you are using a new disk then you must first boot the computer from a bootable floppy or CD and then at the DOS prompt you need to type FDISK and then press the return/enter key.
