I have a Hewlett Packard Pavillion Media Center that includes an expansion bay made just for adding a personal media drive. This media drive will also work with Compaq PCs that have a bilt in drive bay. I chose the 1 TB due to it's large memory size. I use it for storing all of my music and music videos. It works just perfect with my computer. You just slide it right into the expansion bay so you don't need any other power source or addtional USB cables. I have never had a bit of trouble from the time I got it. I never had to format it before use or anything. It does come with an AC adapter and power cord if you want to use it stand alone. I use that when I want to tranfer my music to another device. Like everything HP, it comes software for data backup and archiving. The Windows requirements are ME, XP home or professional, or Vista. Your computer system should recognize it the minute you plug it in. It couldn't be easier to use.