I am not sure I have the nerve to do it, but I could, for example, recode a card so that instead of track 1 containing ^KENNARD/ADRIAN^ it could contain ^SERVICE/INCLUDED^ so that in the US it prints that on the receipt just to confuse them. These are few and far between, but I noted when in the US they not only used the mag stripe but also print the "name" from it on the receipt. Of course there are probably fun uses for this, and also not so legal uses, especially if there are places that only use the mag stripe in some way for bank cards. To be honest, unless you have a mag card based control system of some sort, a door entry system, or maybe handling mag cards is part of the business (like us), you probably have no "legitimate" use for a reader or writer. But I thought I'd order one that writes, why not? I got an MSR Pro USB reader/writer.
It is useful for checking things if needed. We used to have a card reader and it seems to be missing, hence my buying a new one. We sell printed cards, including encoding mag stripes on cards for customers. The driver code is written by me (as had no linux drivers).
We have a nice card printing machine, which will also encode mag stripes on cards. Of course, really, most people have no need for a card reader, and even less use for a card writer.
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