blu-ray better for battery powered devices(and more reliabel)

[jorg]

Blu-ray has a lower rotational speed becuase of its higher data density (due to its larger numerical aperture) technically BD drives need a lower rotational speed to reach the speed increments (e.g. 1x 1.5x 2x 4x) there for using less power to spin the discs compared to hd dvd, also as a result of BD higher density per layer (less movies need to be on duel layer compared to hd dvd) the lens will need to use less power to read single layer opposed to duel layer(if drive has ability to vary wattage)

from the F.A.Q.

How fast can you read/write data on a Blu-ray disc?


According to the Blu-ray Disc specification, 1x speed is defined as 36Mbps. However, as BD-ROM movies will require a 54Mbps data transfer rate the minimum speed we're expecting to see is 2x (72Mbps). Blu-ray also has the potential for much higher speeds, as a result of the larger numerical aperture (NA) adopted by Blu-ray Disc. The large NA value effectively means that Blu-ray will require less recording power and lower disc rotation speed than DVD and HD-DVD to achieve the same data transfer rate. While the media itself limited the recording speed in the past, the only limiting factor for Blu-ray is the capacity of the hardware. If we assume a maximum disc rotation speed of 10,000 RPM, then 12x at the outer diameter should be possible (about 400Mbps). This is why the Blu-ray Disc Association (BDA) already has plans to raise the speed to 8x (288Mbps) or more in the future.

1.7

also due to slower rotation speed/ slower moving parts blu-ray drives become theoretically more reliable at when reading/brunning compared to hd dvd

[McBain]

When playing movies BD spins a little faster than HD DVD.

BD 1.5x
http://www.emedialive.com/articles/r...rticleid=11404

HD DVD 1x
http://www.emedialive.com/articles/r...rticleid=11632

[jorg]

Originally Posted by McBain

When playing movies BD spins a little faster than HD DVD.

BD 1.5x
http://www.emedialive.com/articles/r...rticleid=11404

HD DVD 1x
http://www.emedialive.com/articles/r...rticleid=11632

blu-ray sends more data while playing movies 1x 2x 4x ect are rated by the rate the data moves to the speed of the disc and also the drive mite speed up to read data such as menus faster

[w_tanoto]

it also took less processing power compared to HD DVD. Somebody tested it, and I myself tested it.

[jorg]

yes if i recall hd dvd hdi is totoure on a cpu