I hope I never have to fix a playstation disc drive ever again. It took entirely too long to figure out why this POS only sometimes seeked properly.

(Pictured with the topmost gear removed so you can see the chipped teeth)
Thankfully I had a drive from a launch unit (with an uneven sled) to pull a good gear from.
This drive was from a console I bought for 15 bucks so I could replace the drive in the launch unit (which was free because it didn't work). Early models are very prone to failure.
But now I appear to have two working units– one of which has the early revision GPU that uses VRAM instead of SGRAM– so I can program for the playstation and test on both major silicon revisions like licensed developers had to (on the blue and green debug units).
The early units were slower in some cases, apparently due to hardware bugs that had to be worked around in software, but the later units were slower in others.
I hesitate to call my VRAM unit rare (since it's just a freaking playstation), but it certainly took a while for me to find one since most of them developed bad problems with their disc drives a decade or more ago and probably got junked. When I got mine, it would only read discs when upside down. Additionally, mine is so brittle that all of the screw posts have broken and it's held together by hot glue.

And some audiophiles mistakenly think that the DAC's in the early playstation units with RCA jacks are god-tier, completely ignoring the fact that it's still a freaking playstation with a terrible (and wobbly) disc drive, so that probably also has made them trickier to find. Also, some later revisions of the playstation (like the one on the right here) use the same DAC, but audiophiles never seemed to notice that.
Lubricating the spindle motors with white lithium grease did seem to reduce the vibration/rumbling of the drives, though. I don't get FMV skipping on either system, even when using (good quality, taiyo yuden/JVC) CD-R's.
I'd say they're almost as reliable as my Sega CD now, except I have had to do zero servicing to my Sega CD to make it work as well as it does.
Oh yeah, I also zapped myself on the PSU twice. Fuck playstations.
This post has been edited by dragontamer8740: Sep 24 2019, 17:40