But if the original device didn't pull data from both tracks, this is an improvement: it allows for charging a card if you manage to get a successful read from

But if the original device didn't pull data from both tracks, this is an improvement: it allows for charging a card if you manage to get a successful read from either track. Quick service restaurants want as much of a lunch rush throughput as possible, they care about lost seconds. Also, if the reader manages to grab two error free tracks, it could compare them for accuracy.