Magnetic Card failures

[Thott]

I got a batch of old magnetic cards. Unfortunately about 50% are not usable. With VER they either have the failure message MALFUNCTION or CARD Err.
Even when I write them new.

With my cards I get also sometimes a failure message, but quite seldom.

From a Facebook user I got the advice to wipe the magnetic side with alcohol.

I did it with Methanol.......and it works!

Out of 20 obviously defect cards are now after cleaning 19 card recordable and 100% readable.

Failure messages of the card reader is not always caused by the reader itself but maybe caused by the magnetic card.....