There are two ways of copying CD's to MD. 1) is real-time like tapes. You need a Minidisc recorder (deck/hifi seperate, or portable "walkman" recorder) and you connect to your hifi with either optical cable (if your hifi outputs in optical) or normal stereo RCAs. Then you simply press record on the MD recorder and PLAY on the CD.....
Or, get yourself a Sony NetMD poertable unit. Plug it into the PC via USB, and transfer MP3's to MD directly from the PC, and faster speeds than real time too (can't remember off top of my head, but think it might be 8 or possible 16x - either way, even 2x is faster than real time!!!!)
Plus, NetMD units are pretty cheap on ebay these days
I'm like Cawood - CD for home (well, I also use MD at home aswell) and MD in the car/van