<img src = "http://www.startech.com/trackinggifs/127acaddybk-hit.gif"> This hard drive caddy is designed to fit the StarTech SNT127A IDE Removable Disk Drawer. It allows another drive to be swapped into a PC with the bay portion of the SNT127A installed. This allows a PC to have many interchangeable hard drives with different software or operating systems installed. Several could be used to create a high speed backup system. Visit www.startech.com for more product information.