...that had a 60GB RAM bank that was used as the hard drive? To solve the problem of RAM requiring constant power to retain its memory you would put it in RAID 1 with another drive so that it would have a mirror. Then when you turn the computer on you work off the other drive while it is "warming up" and loading all the files on the hard drive into the RAM. Thus reducing your drive's access time to nanoseconds instead of milliseconds.