i need to know how to take an older HDD(not sure on the specs i didnt put it in) and put it into another tower as a second HDD to retrieve old files from the old drive. need to do this without removing the current drive in my pc (also no specs its a prebuilt comp) because we need the files on it. also the PSU doesn't work in the old tower so no i cant just plug it into a monitor and put it on a flash drive. hope you can help