Retro Erik has done a vidéo on the use of a USB key for mass storage on any PC XT or AT under ms-dos (see the Lo-tech web page).

FreddyV is working on a modification of the driver for better speed on a PC XT or AT. It will be easier then using a Compact Flash card with a XT-CF.

Retro Tech Chris has made a 3D model of a bracket for this ISA card.

See the thread on Vogons.