Very very old thread, but the answer was wrong, so I thought it would help fix it.
Yes, you need a PsOne memory card on the PlayStation 2 to save PsOne games. You cannot save PsOne games on PlayStation 2 memory cards. This said, VZZ's problem was probably caused by a faulty PsOne memory card. Make sure you did not try to format is as a PS2 memory card (I am not even sure this is possible).
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