I tried hex editor. First few bytes: FF FF FF FF 00 00 00 01 – nothing like a standard card header. The rest of the file was dense, high-entropy data. Encrypted? Compressed? Or just noise?
I woke up with my hand on the PS2 memory card.
Inside: a translucent blue memory card. No label. Faint scratch marks. not a ps2 memory card image mymc
And a sticky note in handwriting I didn't recognize:
I copied it to my USB drive using uLaunchELF, then moved it to my PC. The file extension was wrong, obviously. .mymc is a PC tool for extracting PS2 saves. This file claimed it wasn't that. I renamed it to .ps2 and tried opening it in mymc-gui. I tried hex editor
I threw the memory card in the trash.
Error: “Not a valid PS2 memory card image.” Encrypted
Relieved, I went back to sleep.