Optical Storage

The disc

1/6

Optical storage here means a CD, DVD, or Blu-ray disc.
A laser reads and writes the surface. The disc is non-volatile — data stays when power is off.

Legend

	Disc Optical media
	Spiral track Centre → edge
	Pits & lands Bit marks
	Laser Reads the track
	Head & arm Reader sled, not the disc
	Sectors Direct access blocks

Coming soon

Extra practice and notes will live here.