FDS Error 20

[cpc6128]

Hello to all,

I have this error 20 only with the game "Tantei Club Part II Ushiro ni Tatsu Shoujo Kouhen FMC-TC4", I have 4 differents copy all in perfect condition, and all give me this error code with 2 disk drives that work perfectly with all my other disks.
This is the first time I've encountered this error 20, usually it's error 27.
I can't believe that my 4 FMC-TC4 copies are all defective!
Do you have this game and have you ever encountered a specific problem?
I don't plan to calibrate my players which work fine with all other games.

[ziggaboogi]

Sorry to bump up an old thread but figured I should add some info given I just went through the exact same issue on the first Famicom Tantei Club game - Kieta Koukeisha.

For Famicom Tantei CLub (and I assume for most two disk games) you have to load up the first disk with a completed save file to load up the second disk. You can't just load straight from the second disk or else it'll give you error 20. I figured this out as I had to read the manual from the second disk on how to load the game up with the save.