Installs into a standard 3.5\" floppy drive bay and connects to the motherboard\'s USB connection USB 2.0 interface, backwards compatible with USB 1.1 Supplied with 2 SATA HDD trays Compatible with Windows 98SE/ME/2000/XP/Vista/7, Mac OS 9.0 and Linux This USB 2.0 Data Dock is a very compact unit that allows you to add two 2.5\" SATA hard drives to your desktop computer, with a simple insertion/ejection mechanism. Important Information:Hard drive not included. This product supports hard drives up to 9.5mm high only.