Is it true that data on optical discs is written through a laser pressing which creates pits and lands?

The statement that data on optical discs is written through a laser pressing which creates pits and lands is indeed true. This process is fundamental to how optical storage media like CDs, DVDs, and Blu-ray discs function.

When data is written to an optical disc, a laser is used to engrave tiny indentations, known as pits, onto the disc's surface. The areas between these pits are referred to as lands. When the disc is played, the laser reads the pattern of pits and lands by measuring the way light reflects off the disc’s surface. Pits reflect light differently than lands, enabling the data to be interpreted by the optical drive.

This method allows for significant amounts of data storage in a compact format and is an important innovation in data storage technology. The precise arrangement and timing of the pits and lands represent the binary data that computers can read and interpret.