(2TB) HGST / Hitachi Ultrastar 7K3000 (Model: HUS723020ALS640) is a 3.5-inch enterprise. Can be used for continuous 24/7 server and data center operations.(HD Has Great Health)(SAS hard drive only) here please read carefully and make sure this is what you need. thanks for looking if you have any questions feel free to drop me a message.A SAS hard drive is a high-durability storage device built to run continuously in a server environment, unlike a standard desktop hard drive, a SAS drive is engineered for heavy workloads, high reliability, and around-the-clock operation.