Used - Very Good: HGST Ultrastar He10 10TB 7200 RPM SAS 12Gb/s 3.5-Inch Enterprise Hard Drive HUH721010AL4200 - Newegg.com
5400 RPM vs 7200 RPM: Is RPM Still Important? - MiniTool Partition Wizard
Amazon.com: Western Digital Black 5TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6 Gb/s 128MB Cache 3.5 Inch - Western Digital5001FZWX : Electronics