The HP StorageWorks Enclosure 4300 is an Ultra3 SCSI disk drive storage enclosure. These enclosures deliver industry-leading data performance, availability, storage density, and upgradability to meet customers' demanding and growing storage needs. The drive carrier is designed to support the fastest current and next generation Ultra3 and Ultra2 hard drives on the same SCSI bus. The ease of upgrading the StorageWorks Enclosure 4200 to the StorageWorks Enclosure 4300 proves to our customers that HP provides the lowest cost of ownership, as well as the fact that technology transitions can be smooth without disrupting critical business environments.