Abstract: Data validation uses redundant storage of the data on two-layer magnetic tapes. A method and system provide data recording and reading on such magnetic tapes with a high degree of protection from errors and/or fraudulent behavior. The two-layer tape includes a first layer with a high coercive field positioned on a support and a second magnetic layer with a lower coercive field covering the first layer. Synchronous recording is done on the two layers so that all data is recorded on the second layer and some of the date is recorded on the first layer. Data on the second layer is validated upon reading by reading the data in the first layer after erasure of the second layer.

Abstract: A reading apparatus simultaneously detects all the magnetic states previously recorded on a length of a magnetic strip on a substrate. The apparatus has detectors for simultaneously detecting all the magnetic states coded on the magnetic strip and for generating electrical signals indicative of the magnetic states. An electronic circuit processes the electrical signals in order to determine the meaning of the magnetic states. A display shows the meaning of the magnetic states. The apparatus is used to read flexible magnetic tags attached to garments.