581286-B21 / 599476-003 HP 600GB 6G SAS 10K rpm LFF (2.5-inch) Dual Port Enterprise Internal Hard Drive w/ Tray. New factory Sealed Spares for Generation 6 & 7 Proliant Servers w/ 1 Year warranty. We carry stock, can ship same day. ***these are 2.5" SAS drives*** Serial Attached SCSI (SAS) provides a superior storage solution. With some storage requirements escalating and others becoming more complex, factors such as flexibility, performance, increased reliability, greater density, security, scalability and accessibility are more critical than ever. Today's organizations consist of different kinds of environments. Enterprise data centers must be online almost 24X7, fulfill requests from numerous users simultaneously, and allow for constant growth and expansion while in operation. Other customer environments require high capacity storage and high data availability for low I/O environments. HP's portfolio of SAS drives meets all these demands.