Should I use seperate memory cards for US and JPN PS1 games?

[Hobie-wan]

Something I did back when the PS2 came out...
So I only had a few PS1 memcards and I realized the file saves were really small so, I transferred ones I wanted to save to my new PS2 memcard. This worked fine for a long time but after a few years, I noticed that the PS1 file saves started to get corrupted. I never tried to load off the PS2 card (as I read it wouldn't work) but every now and then one of them would say "something corrupt junk message" in the PS2 file browser.

Are you sure? PS1 games can't read PS2 memory cards... I know, I've tried it.

I think he means he was backing up PS1 saves to PS2 card, presumably to make room on a PS1 card for whatever games he was currently playing, then was looking at them on the PS2 card, maybe to move them back.