All of the early fat ps2 models had a noisy tray, and come out all slow and chunkily (like v1-v5 or so) After a while they introduced a new revised fat model (somewhere around v7 maybe?), which took out the firewire port, had quieter fans, had an ir port built in and a much quieter and smoother moving tray, among other small internal changes. If you have a very early model fat ps2 then i would suggest getting a newer one anyways if the drive bothers you as just replacing the tray in these models will not solve the problem likely. You might even have to replace the entire drive assembly, and honestly with the cost of a ps2 nowadays, I wouldn't even bother, either live with it or buy a new one.