Andy, I dont' see why not. USB is backwards compatible. You just won't get the USB 2.0 speeds. Barry. From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf Of ANDY COLLINS Sent: Monday, July 26, 2010 10:59 PM To: access-uk@xxxxxxxxxxxxx Subject: [access-uk] USB connectivity Hi all - Will a high-speed 2.1 USB external hard drive run on an XP computer whose ports are the old 1.1 speed? - Andy