What is the typical capacity of a DVD-R disc? MCQ with Answer and Explanation

Explanation:
Blu-ray discs use a blue-violet laser with a shorter wavelength (405 nm) than the red laser used in DVDs (650 nm), allowing smaller pits and more data per area.

Explanation:
Pen drives use NAND flash memory, which is a type of electrically erasable programmable read-only memory (EEPROM) that functions without moving parts.

Explanation:
Because HDDs rely on a physical read/write head hovering nanometers above a spinning platter, sudden impacts can cause the head to strike the platter, causing a destructive 'head crash'.