Are PlayStation 1 Memory Cards Compatible with PlayStation 2? No - Different Connectors & File Systems

No, PS1 and PS2 memory cards are not interchangeable. They use different physical connectors and file systems.

• PS1 Card: Small, rectangular, proprietary connector.
• PS2 Card: Larger, different proprietary connector.

You cannot use a PS1 card in a PS2 slot, or vice versa. PS2 consoles can read PS1 cards only for PS1 game saves when playing PS1 titles via backward compatibility, but they cannot store PS2 saves on a PS1 card.