COMPUTER FUNDAMENTALS

Detailed explanation-1: -Magneto-optical recording writes/reads optically. When writing, the magnetic medium is heated locally by a laser, which induces a rapid decrease of coercive field. Then, a small magnetic field can be used to switch the magnetisation. The reading process is based on magneto-optical Kerr effect.

Detailed explanation-2: -Magnetic storage consists at least of a write head, a read head, and a medium. The write head emits a magnetic field from an air gap to magnetize the medium. The read head detects magnetization (the magnetic moment per unit volume) from the medium to recover stored data.

Detailed explanation-3: -Read/write heads are typically made up of a thin horizontal magnetic blade attached to an actuator arm. By changing the electrical polarity of bits on a magnetic disk, the read/write arm effectively records data to a disk drive.

Detailed explanation-4: -A hard-disk drive consists of a rigid disc made with non-magnetic material, which is coated with a thin layer of magnetic material. Data is stored by magnetizing this thin film. The disk spins at high speed, and a magnetic head mounted on a moving arm is used to read and write data.