Thermaltake 5.25" (x3) Bay to 3.5" (x4) Bay Mobile Rack HDD Canister RC3400101A. Read & Write 4 Hard Drives simultaneously. Supports All Standard 2.5" & 3.5" SAS, SATA (SSD) Hard Drives. Support and Compatible with most Desktop or Industrial Rackmount Chassis with available 5.25" Drive Bays.. Plug & Play / Hot-Swap Capability for Rapid Multi HDDs Access & Exchange*. Dedicated Hard Drive LED Status Indicators for each individual HDD Tray. High Performance Transfer Rate up to 6Gbps for SAS & 6Gbps for SATA (SSD). Support RAID 0, 1, 5, 6, 10 functions*. Dedicated Safety Lock for each individual 3.5" HDD Tray. 3 Stage Temperature Alarm Settings & Reset. Aluminum Body Construction for Durable Stability. Built-in Speed Adjustable 80mm Cooling Fans maximizes Heat Dissipation & Exhaust. * Hot-Swap & RAID functions require SATA & optional RAID Controller.