HP ProLiant Ultra320 146 GB Universal SCSI Hot-Plug Internal Disk Drive (286716-B22) Designed for Ultra 320, Ultra3 or Ultra2 capable ProLiant Servers, ProLiant Storage Systems, AlphaServers, and StorageWorks HP enclosures 10,000 RPM spindle speed Ultra320 SCSI LVD interface 320 MBps (external) data transfer rate Offers the flexibility and expandability to meet your growing storage capacity requirements