Question: Although the optical discs are all 5 , a CD drive can not read a DVD disc, and a DVD drive can not read a

Although the optical discs are all 5 , a CD drive can not read a DVD disc, and a DVD drive can not read a Blu-ray disc. Why not? (Hint: research - pits, lands, and laser beams)

A smartphone with 128 GB of removable storage is using what type of SD card?

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