How do I fix a I/O0002 DISK ERROR in a NeoGeo CD?

[STICH666]

My friend is selling me one for pretty damn cheap and this seems to be the only problem. It plays fine for awhile then all of a sudden it comes up with this error he says. How do I fix it?

[Trooper]

http://tinyurl.com/mseqmt

[mimo]

pmsl