Part# MD900GB10K2.5-G Original Dell 900GB 10000 RPM 2.5" SAS hot-plug hard drive. (these are 2.5 inch drives) Comes w/ drive and tray for your MD-Series PowerVault Arrays.
Amazon.com: HP 900GB 10K RPM SAS 2.5 Inches 6G SSF SAS Dual Port 619286-004 : Electronics