What allows DVD's to hold more than CD's?

Question

DVD's and CD's utilize the same amount of space and encode data in the same way, so why can DVD's hold so much more?

Answer 1

The wavelengths are shorter.

It’s the use of exactly the same technology as a standard CD player, just an upgraded laser. The laser incidentally, costs no more to produce either! Which leaves these high definition Blue ray players costing no more than a portable cd-player we used to give the kids?

BluRay. Is the use of a blue LED Light Emitting Diode, costing about the price of chocolate bar!

Nothings new except the LED!

The whole technology business is a total scam!

Answer 2

Because the tracks are significantly narrower and closer together on a DVD. The pits and lands (which encode the 1s and 0s) are also much shorter and closer together.

It's a bit like an LP record (vinyl) compared to a 78 record, if you understand the comparison. They are the same size, but the LP has narrower grooves and spins at a slower speed, so it holds a lot more music.

Or, you can fit a lot more words on a piece of paper if you use 6 point text as opposed to 16 point text. However, you need better eyesight (better technology) in order to read the 6 point  text.