primary partition

primary partition: A type of partition that you can create on basic disks. A primary partition is a portion of a physical disk that functions as though it were a physically separate disk. On basic master boot record (MBR) disks, you can create up to four primary partitions on a basic disk, or three primary partitions and an extended partition with multiple logical drives. On basic GUID partition table (GPT) disks, you can create up to 128 primary partitions. Also known as a volume.