I wanted a flash drive for a Window Vista RAM ReadyBoost. As it says "works with Window Vista," I thought it would be used to serve the purpose, but I was wrong. This is the writing I found from Kingston FAQ;' ReadyBoost is a Windows Vista feature which has the ability to utilize USB flash drive storage space to improve system performance. DT1 DataTraveler High Speed does not support Windows ReadyBoost. 'It is simply an inexpensive slow secondary back up tools. It is handy to own a flash drive for everyone. But it has shown a slower file transfer rate than my other media like Memorex 4Gb flash drive sold at $70+, and ultra 2Gb Sandisk memory card, that is almost several months old now.The reason I give 2 star is because it is low-priced.