3.5" Tray-Less Dual 2.5" SATA HD Hot-Swap Bay - Based on the same easy swap mechanism and design of the top selling HSB100SATBK, the HSB220SAT25B is a 3.5" SATA hard drive hot-swap bay that allows you to install up to Two 2.5" SATA drives in an available/unused 3.5" floppy drive bay. The convenient no mounting required /easy eject feature (like a tape cartidge or floppy disk) makes it the ideal solution for quick and easy drive removals and insertions as part of a system building process, or with rackmount systems or in industrial environments. Also a perfect addition for operating system image deployment and any task that requires being able to quickly access large volumes of data on the fly, the HSB220SAT25B provides everything you need to expedite important projects.