You can get a remarkably similar effect today with tmpfs, in fact I'm writing this on a root-on-tmpfs machine. I store my root fs as a tar file so it can be read and written without much disk seeking. I have a paltry 8GB of RAM, but it's more than enough for the 2.7G rootfs, which takes about a minute to load/dump. It's dumped every night, and I even have apcupsd start a dump when the power goes out. I've been running this way since about November of 2005 with no problems, and it's FAST!
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