Silverstone's rm21-304 is a high performance storage Server Chassis designed for the professional storage environment. It is equipped with hard drive trays compatible with 2.5" Or 3.5" Drives and has fan Assembly with motherboard Support for up to Micro-ATX form factor. There are also flexible mounts to accommodate most 2U single/ 2U redundant server, PS2 (ATX) power supplies. Rm21-304 also has ergonomic, tool-less rail* designs for easy rack mount integration. With an overall package Designed for maximizing efficiency, flexibility, and durability, The rm21-304 is a great choice for professionals or data center engineers looking to build a storage Server.