Magneto-optical storage devices combine magnetic and optical technologies to store data. They use a laser to heat a small area of a magnetic material, allowing the magnetic state to be changed. This process enables the writing of data, while reading is done by detecting the reflected light from the surface. These devices are known for their durability and long data retention. They are often used in applications requiring reliable data storage, such as in data archiving and backup systems. Examples include MO discs and MO drives, which can hold large amounts of information securely.