Bad batch of cards, or reader/writer issue?

[BillBee]

Hi Dave,

I have had to alcohol wipe cards when I had that issue (they were of unknown age). A 41 would write and xeq vers indicated all was well. Next day I swapped the reader to transfer the program to a different 41 and "error". Alcohol wiped the card, rewrote the program and it worked. Oxidation of the tape surface?

Assuming the 41 reader was good, its just odd that both units would fail. Just thinking.

-Bill