Windows 2000 and XP supports two types of disk storage: basic storage and dynamic storage. A physical disk must be either basic or dynamic... Basic Disks: The industry standard is basic storage. It dictates the division of a hard disk into partitions. A partition is a portion of the disk that functions as a physically separate unit of storage. A basic disk can contain primary partitions, extended partitions, and logical drives. New disks added to a computer are basic disks.. Only Windows 2000 and XP and 2003 Server systems support dynamic storage. To support dynamic storage, a single partition is created that includes the entire disk. Dynamic disks: are divided into volumes, which can consist of a portion or portions of one or more physical disks. A dynamic disk can contain simple volumes, spanned volumes, striped volumes (RAID-0), mirrored volumes (RAID-1), and striped with parity volumes (RAID-5). You create a dynamic disk by upgrading a basic disk. You can use software raid on dynamic disks which isn't situation for basic disks.. Hope that helps..