Now you can swap between 3.5" Serial ATA (SATA, SATA II, SATA III) hard drives in seconds. Bring the Startech 4 Drive 3.5" Trayless Hot Swap Sata Mobile Rack Backplane, and enjoy benefits of this great time saving storage solution. This Hard Drive Mobile Rack offers four tray less SATA hard drive bays and allows you to hot swap Serial ATA hard drive. It also avoids having to mount the drives to trays for deployment or detach them for replacement. This Aluminum Mobile Rack is a solid construction that supports up to four hard drives. It is capable of taking up to three 5.25" drive bays inside a host computer and provides with maximum space-efficiency within the computer. This Removable Hard Drive Rack is fully backed for SATA HDD speeds up to 6Gbps. It is compatible with RAID installations and ensures utmost performance and flexibility for improved storage applications.