Ok. I had to look it up.
If popsci.com is to be believed, it's due to the thickness of the card and has nothing to do with the integrity of the magnetic strip or the card reader itself. It appears to be based on physical dimensions only.
However, at metafilter.com, the reason is further defined that if a reader is sensitive enough, any flaws or damage to a magnetic stripe will be enough to corrupt the data and cause a read failure. When a few microns of distance is added between the reader and the card, however, it effectively "blurs" the data to give a more uniform read, causing flaws to no longer foul it.
Another option mentioned is that if you have a finicky card, you can place a line of clear tape over the stripe, and that will have the same effect as a plastic bag and be a more permanent solution.
^-.-^
If popsci.com is to be believed, it's due to the thickness of the card and has nothing to do with the integrity of the magnetic strip or the card reader itself. It appears to be based on physical dimensions only.
However, at metafilter.com, the reason is further defined that if a reader is sensitive enough, any flaws or damage to a magnetic stripe will be enough to corrupt the data and cause a read failure. When a few microns of distance is added between the reader and the card, however, it effectively "blurs" the data to give a more uniform read, causing flaws to no longer foul it.
Another option mentioned is that if you have a finicky card, you can place a line of clear tape over the stripe, and that will have the same effect as a plastic bag and be a more permanent solution.
^-.-^
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