The Optima Pro Attache is a high-speed USB thumb drive from PNY that is certified for Windows Vista ReadyBoost technology. ReadyBoost technology allows Vista to use the thumb drive as a buffer between the RAM and the hard drive to speed up overall computer performance. The main requirements for ReadyBoost revolve around transfer speed, therefore even if you're not using the drive with Vista you will see better data transfer performance between your computer and the drive than with other non-high-speed drives.