SRT will cache windows files. The best use of it is to just buy a 64gb drive and use the whole thing for caching. I'm currently doing just that and for things on the drive, it runs just like having an SSD. I can tell when I go back to a game I've not played in a while and it has to pull the data off the HD, but after that first load, all the same. Stuff like windows and chrome don't get pushed off because I'm always using them.