PS2 memery card on PS1?

[flamepanther]

A lot of clone cards fit more loosely, so it's easier to get a poor connection from them. That might account for some of it. Performance brand cards have always worked great for me, and those fit pretty tightly.

[Niode]

The problems seem to come from the 'compressed' memory cards, eg the ones with 4x as many blocks. These are the ones most likely to have corrupted saves. I have a bunch of official memory cards and they all still work to this day. I also have a bunch of 1MB third party memory cards and they are also fine. I never touched the 'big' third party memory cards because of the whole 'corrupted saves' issue that quite a few people had issues with during the PS1s lifespan.