Bad batch of cards, or reader/writer issue?

[Dave Britten]

(08-06-2021 01:07 PM)cahlucas Wrote:  What you also have to take into account is (strong) magnetic fields. These can make all information stored on the cards unreadable. It seems best to me to store all cards in a metal box, which keeps out all magnetic fields. If you also add some water-absorbing granules in a cotton bag, you will probably get rid of the oxidation.

That's a good idea. Something like a small metal cash box would be ideal, I would think. And hopefully my ham radio transmissions aren't powerful enough to scramble any cards that happen to be in the room...