I hokked up my minidisk player to my PS2 and recorded a few songs to my minidisk and it worked fine. It was an older cd though. I usually just record to my house deck, but I got one of those LP minidisk recorders and I don't feel like taking apart my system everytime I wanna make a mix. I also got some game sounds on minidisk....I got the soundtrack from spyhunter on minidisk and I'm looking to get some soundeffects on minidisk and transfering them to the PC or keeping them on the MD so I can freak people out on the street. either way, it's pretty fun.
by the way, I had to turn the optical out option in the system config menu on for it to work and it recorded like any other source to the minidisk, a 4 minute song took 4 minutes to record.