Optical disk and Primary storage

Optical disk noun - A disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface.

Primary storage and optical disk are semantically related in computer storage topic. In some cases you can use "Primary storage" instead a noun phrase "Optical disk".

Optical disk and primary storage are semantically related in computer storage topic. You can use "Optical disk" instead a noun phrase "Primary storage".