DVD would be used over blu-ray because blu-ray players are more expensive and aren't built into any teacher's laptops. Also blu-ray dvd's aren't as popular as the standard dvd and are quite expensive to buy. However blu-ray dvd's offer higher quality in picture and sound and can store 25,50 and 100GB onto a single disk.
DVD-R's would be used over a DVD-RW disk in case of data being accidently deleted. However DVD-RW's are useful and more appropriate when you're constantly saving and deleting different projects onto the disk.
However the best storage devie would have to be the simple though effective memory stick. These can store mane GB's of data without having to delete items already on it. They're small and loading and copying time is fast.
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