whatswithjeff.com: "Western Digital has released a new SAS hard drive for enterprise and server use, called the WD XE SAS hard drive. It’s an enterprise class hard drive with 10,000 RPM spindle speed and 6Gbps SAS interface. The main drive has a 2.5-inch form factor. But a WD XE 3.5-inch is also available, which is the mounted version of this drive. It basically looks like the WD Velociraptor, but instead of a Serial ATA interface, it’s using Series Attached SCSI connectivity. Check out more details below and where you can get one."