Computer Science – Data storage | e-Consult

Magnetic Storage: Data is represented using magnetic polarities. A magnetic head writes data by magnetizing tiny regions on a rotating platter. Data is read by detecting the magnetic polarity of these regions as the platter spins. The direction of the magnetic field (north or south) represents a 0 or a 1.

Optical Storage: Data is represented by pits and lands on the surface of a disc. A laser beam is used to read and write data. Pits scatter the laser light, while lands reflect it. The presence or absence of reflected light is interpreted as a 0 or a 1. The spiral track allows for continuous data storage.

Solid-State Storage: Data is stored in memory cells within flash memory chips. These cells are made of transistors that can store electrical charges. The presence or absence of a charge represents a 0 or a 1. Data is read and written by applying or removing electrical charges to these cells. Data is organized into blocks and pages for efficient storage and retrieval.