Card interfaces well with printers and most devices, but I experienced very slow disk writing to external USB hard drives, particularly with large files. I am an advanced user who installed this card as a USB 2.0 upgrade in a very stabile Dell 733 running a perfect copy of Win 2000. Intermittent unexplainable write delays using the Iogear card. The same drive works fine in the motherboard's USB 1.1 ports (but not at USB 2.0speed).