The HUC101212CSS600 HGST 1.2TB internal hard drive is a high-performance SAS drive with a rotation speed of 10000 RPM and a storage capacity of 1.2TB. It features a 64MB cache and a 2.5 inch form factor, making it suitable for use in servers and other high-performance computing systems. The drive is designed for hot swap capability, ensuring easy maintenance and replacement in a server environment. Made in Thailand by HGST, this Ultrastar product is reliable and efficient for demanding storage needs.