As the title says, can i fit one of these and install a fresh OS on it like Windows 7 for example or will i be just better adding the HDD to my tower case. I already have two HDD's in my system with Vista Ultimate 64bit and Vista Home Premium 32bit. What would i have to do if i fitted another clean HDD to install Windows 7 on it?? I have been tempted to simply unplug the existing HDD's to avoid confusion and reconnect them afterwards but am not sure if this is the correct way of doing it. Thanks.