Just got this email so be careful. Dear PlayStation(R) Underground Member, You are scheduled to receive the Holiday 2004 Demo Disc including the playable Viewtiful Joe 2 - please take note. It has just been brought to our attention that there is a glitch in this demo which will erase all of your saved files from your Memory Card(s). If you have not yet played the Viewtiful Joe 2 demo, please remove your Memory Card(s) from your PlayStation(R) 2 computer entertainment system before you load the Holiday 2004 Demo Disc. Sony Computer Entertainment America would like to express our sincerest apologies for any inconvenience this may have caused you. http://playstation.mx0.net/r?clHqJqEcPTJEHWHJlnlvJn "PlayStation" and the "PS" Family logo are registered trademarks of Sony Computer Entertainment Inc. The Sony Computer Entertainment logo is a registered trademark of Sony Corporation. Sony Computer Entertainment America Inc. 919 East Hillsdale Boulevard, Foster City CA 94404
Probably the same bug of the first PS2 released in Japan. Ridge Racer V caused it, if i'm not mistaken.
Star Ocean 3 did something on the line of the memory card corruption glitch, if I'm not mistaken. The JP version, that is. There was a glitchy Lunar SSC demo in the US, also... not sure whether it'd corrupt the whole memory card or just its own file, though.