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Seagate's new Savvio 15K spins at 15,000 revolutions per minute, which means data can be found and retrieved faster than with preceding 10,000rpm 2.5-inch models.
Seagate also said the drives consume 30 percent less power than current 3.5-inch 15K drives.

The Savvio 15K drives are Serial Attached SCSI models geared for servers.
Seagate is shipping the drives only to computer makers right now.
Props to SeaGate