Electronic circuit and data storage system

A circuit comprising a resistive element and having a first configuration in which the resistive element has a first resistance-prior to exposure of at least part of the resistive element to electromagnetic radiation and a second configuration in which the resistive element has a second resistance after exposure of at least part of the resistive element to said radiation, wherein said second resistance is lower than said first resistance and further comprising a display element coupled to the resistive element, the circuit being arranged such that a state of the display element during an operation of the circuit is dependent on whether the resistive element has said first or said second resistance.

A method of storing data, the method comprising:

• receiving a piece of data to be stored;
• determining a number or a dose of electromagnetic radiation according to the piece of data;
• irradiating at least part of a resistive element with said number of pulses of electromagnetic radiation or said dose of electromagnetic radiation to change a resistance of the resistive element from a first resistance to a second resistance, wherein the second resistance is lower than the first resistance, and a difference between the first resistance and the second resistance is dependent on said number or said dose.