Track data resides on the magnetic stripe of credit and debit cards, organized as follows:
Conversely, ATMs and gas station pumps often store only Track 2 data. If a criminal collects a "dump" (Track 2) from a skimmer at a gas pump, they cannot immediately use it for most online "card not present" (CNP) fraud. They need to convert the Track 2 string into a valid Track 1 string. Track2to1 Generator LINK