I have a new HP 9600t (i7,6GB RAM, HD4850 GPU). It comes with Vista 64. Lots of my apps don't work on Vista 64. I want to install VMware Workstation and create 3 VM's: XP 32 (app compatibility), Vista 32 (app compatibility), and Vista 64 (app compatibility testing). I have two (the max possible) 1TB HDD's. I have a number of 1TB Personal Media Drives that plug into the PMD bay of the PC for data; that interface is USB2. Most of my data doesn't need higher data rate access than USB2. Some of it does sometimes (e.g., transcoding a video) in which case I can copy it as needed to a data partition on one or the other of the HDD's. I have no experience with VM software. My 2-part question is: 1. On which of the two HDD's should I put the VM's for maximum performance - the one with the host Vista 64, or the other one, or both? 2. On which HDD(s) should I put the data needing high bandwidth access to, given that sometimes some data will be accessed by host Vista 64 and sometimes some by VM XP 32 ?