The HP StorageWorks Modular Smart Array 20 Enclosure (MSA20) is a SATA 1.5 Gb/s 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, archival, and disk-to-disk backup. The 2U array houses up to twelve 1" Universal hot pluggable SATA 1.5Gb/s drives.