What is Secondary Storage?
Difference between Blu-ray and DVD
- Blu-ray discs use blue/violet lasers rather than red lasers as used by DVDs
- Storage capacity of Blu-ray discs is much higher than standard DVDs
- Blu-ray discs use one polycarbonate layer; DVDs use two layers
- Blu-ray discs have a built-in secure encryption system
Difference between DVD-R and DVD-RAM
- DVD-R has one spiral track; DVD-RAM has several concentric tracks
- DVD-R only allows data to be read (can’t write to it) whereas DVD-RAM allows reading and writing operation