Blu-ray Clarification Needed ASAP!!!! - Club CDFreaks

marisaadair · 01-06-2006

Hi all -- I'm new and I have a question. In an article written and posted on this site regarding the differences between Blu-ray and HD-DVD, they say one of the differences is the structure of the discs. The Blu-ray disc is composed of a 1.1 mm layer and .1 mm protective coating... the HD-DVD is composed of a .6 mm layer and .6 mm protective coating. The article says the reason the Blu-ray can hold more is because the laser only needs to go through .1 mm of space versus the HD-DVD of .6mm, therefore it can record more which means increased capacity... is that accurate???? -- I have been looking everywhere and can't seem to find someone (Blu-ray Disc Association or familiar) to confirm if that is true or not -- HELP!!! Please clarify if you know!!
Thanks!!

*JayC30* · 02-06-2006

If you look at your post you will see that two parts are in blue. Click on them and they will take you to articles on CD freaks that should give you more information and may even clarify it for you.

**H3rB3i** · 02-06-2006

Quote:

Originally Posted by CDF article

The reason for this is the disc itself: while HD-DVD uses a similar disc to the DVD (0.6 mm disc with 0.6 mm protective coating), Blu-ray steps away from the DVD norm and uses a 1.1 mm disc with a protective layer of only 0.1 mm. The recording layer is therefore very close to the surface of the disc. The advantage is that the laser has less material to read through, which allows a higher NA, a lower track pitch, a smaller pit length and therefore more storage compared to HD-DVD.

physics is clarifying this

NA (Numerical Aperture): higher NA (because of the lower distance from lens to recording layer) = smaller spot size (diameter of the laserbeam) compared to HD-DVD

Because of this you can focus the laser with much higher precision and this allows to reduce the track pitch (distance between the centers of two adjacent tracks on a disc) and the pit length. = Higher data density = more capacity

*koolaidwa* · 29-09-2006

dont scratch that blu-ray or u will be buying a new disc to replace it

sorry i like a lil protection

01-06-2006	#1 (permalink)
marisaadair New on Forum Join Date: Jun 2006 Posts: 2	Blu-ray Clarification Needed ASAP!!!! Hi all -- I'm new and I have a question. In an article written and posted on this site regarding the differences between Blu-ray and HD-DVD, they say one of the differences is the structure of the discs. The Blu-ray disc is composed of a 1.1 mm layer and .1 mm protective coating... the HD-DVD is composed of a .6 mm layer and .6 mm protective coating. The article says the reason the Blu-ray can hold more is because the laser only needs to go through .1 mm of space versus the HD-DVD of .6mm, therefore it can record more which means increased capacity... is that accurate???? -- I have been looking everywhere and can't seem to find someone (Blu-ray Disc Association or familiar) to confirm if that is true or not -- HELP!!! Please clarify if you know!! Thanks!!

02-06-2006	#2 (permalink)
JayC30 CDFreaks Resident Join Date: Feb 2005 Posts: 2,140	Re: Blu-ray Clarification Needed ASAP!!!! If you look at your post you will see that two parts are in blue. Click on them and they will take you to articles on CD freaks that should give you more information and may even clarify it for you. __________________ "I'm only happy when it rains, I feel good when things are going wrong, I only listen to the sad, sad songs, I'm only happy when it rains" (Garbage-"I'm Only Happy When It Rains")

29-09-2006	#4 (permalink)
koolaidwa CDFreaks Resident Join Date: Jan 2005 Location: WA State Posts: 747	Re: Blu-ray Clarification Needed ASAP!!!! dont scratch that blu-ray or u will be buying a new disc to replace it sorry i like a lil protection

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