The HP StorageWorks 20 Modular Smart Array Enclosure (MSA20) is a SATA disk drive storage enclosure with Ultra320 SCSI host connectivity. These enclosures deliver industry-leading availability, storage density, and upgradeability to meet customers' demanding and growing storage needs. The MSA20 delivers the ideal mix of low-cost and high capacity, for minimum I/O workloads such as reference data, archiving, and disk-to-disk backup. The MSA20 provides storage capacity of up to 6TB per enclosure (using 500GB 1-inch SATA disk drives). Modular design allows up to 21 enclosures to be mounted in one 42U rack for a single rack storage capacity of up to 189TB of disk storage or up to 8 enclosures in an MSA1500 configuration for storage capacity of 48TB in an entry-level SAN.