The HP Storage Works Rack-Mount Kits provide a high-density, rack-mountable tape drive & removable hard disk drive enclosure for direct-attach SCSI, USB (Universal Serial Bus), & SAS backup & archiving applications. Because these enclosures use standard internal tape drives & internal removable hard disk drives, they provide a cost-effective means of mounting tape drives & removable hard disk drives in rack server environments. These enclosures provide customers with scalability, allowing the customer to add drives & migrate to new tape or removable hard disk drive technologies as their capacity & performance needs grow.