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Originally Posted by GDW1975
The usual method is that the fraudulant swipe is used to record the data by means of a handheld card reader, and then this copied data is physically written to another card which is usually a stolen credit card that has been maxxed-out and itself then been cancelled. This means that the thief can re-use the stolen credit card until it's cancelled as the magnetic strip now contains details of an active account. Once the fraudulent activities are identified, the account becomes frozen and the thieves will then overwrite the card data on the magnetic strip with somebody else's data that they've also skimmed illegally.
This whole process could fall down if shop assistants took the time to verify that the details physically printed on the card match those printed on the receipt, but this doesn't always happen. Also, the use of Chip & Pin will dramatically reduce the amount of skimming that is possible.
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This is why you see competent shop assistants circle the last 4 digits printed on the paper ticket and check they match those embossed on the card. If the data track is rewritten, it is highly unlikly 10000/1 that they will match.