AR MAX is likely what corrupted the card. It has several bugs with that result, usually the Move or Delete commands being the trigger. Only use Copu and Uncrush in the future, and use the Browser for and deletion.
Originally Posted by OmniSlash2o6
AR MAX EVO is also the thing you already have that can fix your card. It can manually reformat a memory card by you pressing Square when you have the device highlighted when picking a source device.
My PlayStation2 HDD guide.
NTSC J SCPH 30000 with HDD and PSBBN 0.32
NTSC U/C SCPH 30001R Astral Blue LE PS2
Final Fantasy XI status:
Server - Ragnarok, Race - Mithra, Jobs - BLM 72 WHM 51 SCH 39 SMN 25, Nationality - Windurst, Name - Bungiefan