I don't think your saves are being erased from your PS2 card. The thing is, PS1 software cannot read PS2 memory cards...
PS1 memory cards use blocks as a means of storage and there are 15 on a card. PS2 uses kilobits instead, this way you are limited only by space remaining rather than blocks.
PS1 games don't understand how to read PS2 format memory cards so therefore no games will appear on the PS2 card in a PS1 game - and vice versa for PS1 cards in PS2 games.
- S
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