My memory card for PS2 won't let me save with 64,000Kb free, or so it says

S

Stardarkening

I'm playing a game, and it won't let me save, when all that it requires is 90kb free. When I try another card in the other slot, it doesn't read that it is there. On the browser, however, both are reading and both have enough memory to save the program. Is something corrupted? Please Help.
 
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