The servers have 3.5-inch and 2.5-inch hard disks, including Seagate, Western Digital, Toshiba, Dell, Hewlett-Packard, IBM and Huawei, which are contracted by Seagate and Western Digital. The hard disk interfaces of the server are SATA and SAS, and the rotational speeds are 7500 rpm, 1W rpm and 1.5W rpm respectively, with capacities ranging from 300G to 20T and prices ranging from 600 to 24000.
Server SSDs include Samsung and Intel. Common capacities are 240G, 480G, 960G, 1.92T, 7.68T, etc. The interfaces are SATA, U.2, SAS, etc.
Solid-state hard disk is often used as system disk, and the main purpose of server mechanical hard disk is big data storage.