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Blu-ray vs. HD-DVD

Posted 09 March 2005 04:26 CET by Herbert Klausner

 


 

  

Authors: spath & H3rB3i
Date: March 2005

2005 is here and the companies promoting the next generation storage formats are ready for the last and most important rounds in the 'war", which will probably answer the question: which format will become the next standard for movie and data storage?

HD-DVD and Blu-ray: What are the technologies?


 

 

These two formats are heralded as the successor to the current DVD technology. Blu-ray and HD-DVD have both been developed to enable recording, playback and rewriting of high definition video and data. The key to these technologies is the blue-violet laser that is used to write the data to the disc. This blue laser has a much shorter wavelength than the current red laser DVD system, which makes it possible to read and write smaller pits, as a result, these discs can hold up to 15 GB (HD-DVD) and 25 GB (Blu-ray) of data on a single sided single layer 12cm disc.

This additional storage capacity will be essential when HDTV becomes mainstream, in order to allow storage of HD TV shows or movies on an optical disc in the same high quality. You can record about 13 hours of standard TV but only a bit more than 2 hours of uncompressed high definition TV on a 25GB disc.

When we take a closer look at the two competing formats, we can quickly see that the dimensions of the discs and the use of a blue laser are about the only similarities the two formats share.

But before we start to compare the two formats to find out the differences, let us explain some terms we will need to know, to understand how it is possible to store that high amount of data on discs that are looking like conventional CDs or DVDs.

Numerical Aperture (NA)

The numerical aperture of an optical lens is a measure of its ability to gather light and resolve fine specimen detail at a fixed object distance.

Together with the wavelength, this is how the NA or the resolution of an optical system is determined. The NA and the wavelength also define the size of the laser beam; the result of a higher NA and a shorter wavelength is a smaller laser beam.

This allows focusing the beam with much higher precision and a reduction of the Track pitch.

Track Pitch

The data track of an optical disc is a spiral starting from the centre of the disc; the distance (in micro meters) between two rows of the track is the track pitch. It is measured from the centre of the row to the centre of the next row.

When the Track Pitch can be reduced, this means that the distance between the rows is lower and that the resulting track is much longer, thus you can store more data.

 


tanile
New on Forum
Posted on: 09 Mar 05 06:18
good article, thanks guys
0 Agree

japroach
New on Forum
Posted on: 10 Mar 05 04:24
Could you add a "Next" button on your articles? thanks
0 Agree

Kenshin
MyCE Resident
Posted on: 12 Mar 05 20:05
Another great article, thanks!
0 Agree

Seer
New on Forum
Posted on: 16 Mar 05 11:27
Good article & explanation, thanks! Maybe the argumentation with regard to disc cost would need some extra analysis: To make a (HD)-DVD disc you need two moulding machines and an extra process to glue the two 0.6mm substrates together, which means you loose valuable seconds. Also the HD-DVD disc tolerances for flatness & thickness are extremely tight (twice more critical than that of normal DVD). To make a Blu-ray disc you need only 1 moulding machine and you don't have to glue the two substrates, which means less production time. In fact a Blu-ray disc can be compared with an up-side-down CD disc... which is very simple to make. As for disc tolerances of Blu-ray, these are comparable with normal DVD, resulting in an much more controllable production process. This means better yields and that future high-speed discs are easier to make. All in all, you might be able to upgrade DVD lines to make HD-DVD's, but in time the mass-volume production process itself will be less expensive for Blu-ray.
0 Agree

H3rB3i
Retired Editor, Reviewer & Senior Moderator
Posted on: 16 Mar 05 11:41
Very interesting, can you tell me your source (PM or e-mail if you don't want to post here) thx
0 Agree

guest
No longer with us
Posted on: 24 Apr 07 00:38
Professional writers, who are interested only in clearly communicating their message, not in showing that they know more about their own subject than the reader, define their terms and acronyms.
0 Agree

guest
No longer with us
Posted on: 15 Sep 07 11:47
i got all the information
0 Agree

guest
No longer with us
Posted on: 16 Sep 07 11:33
seäoig pr'x9p ny
0 Agree

guest
No longer with us
Posted on: 22 Sep 07 22:36
Scratches seem a risk with HD-DVD. If present disc substrate is used and density is higher, scratches will have greater effect. Cost of -R media is much cheaper for Blu-Ray per GB. (Wikipedia comparison article)
0 Agree

guest
No longer with us
Posted on: 16 Oct 07 04:29
A far good explaination ....
0 Agree

guest
No longer with us
Posted on: 21 Oct 07 04:56
So, the bottom line is that the only real difference between blu-ray and hd-dvd is that you can store more information on a blu-ray than on an hd-dvd? Which in turn can result in using higher quality video (if we are talking about video) on a blu-ray, which if using standard video formats on an hd-dvd will result in both mediums storing the same amount of data? Synopsis; We have a 64mb usb drive (hd-dvd), we place two 32mb files on IT. Next, we have a 128mb usb drive, (blu-ray) and we place two 64mb files on it. The end result is, on the hd-dvd we have placed two files, and on the blu-ray we have ALSO placed two files on IT. The end result is that the only difference between blu-ray and hd-dvd is storage capacity. This is correct? I may just be curious cause a lot of what I read states that blu-ray is better than hd-dvd. I'm aware of the cost increase for blu-ray is because of the tailoring that must be made to manufacture this medium. I'm not sure if there are any other features of blu-ray that hd-dvd doesn't have, but if there is,please enlighten me. Thanks - Vorp
0 Agree

guest
No longer with us
Posted on: 22 Nov 07 09:33
Good ! Tnx. Is it obvious that image resolution is the same ? Not clear to me.
0 Agree

guest
No longer with us
Posted on: 22 Nov 07 19:28
Good review. I begin to understand from reading it. My guess is the ease of manufacturer pretty much guarantees the future of blue-ray.
0 Agree

guest
No longer with us
Posted on: 11 Mar 08 01:27
This may be a silly question, but, would it be possible to create some sort of software to enable the Xbox 360 HD DVD drive to read Blu Ray discs?
0 Agree

guest
No longer with us
Posted on: 31 Mar 08 00:57
We have an old proverb, that says: The sound of drom is pleasant rom faraway. It is a very goog article. At the end everybody thinks of more capacity, but what about the negetive points. What happens if in the future consumers have to spend more. (capacity) verses (security against scratch or other damages and so on)which means more costs for consumers and more profit for manufcturers. It may seem nothing, but it is actually a lot.
0 Agree

guest
No longer with us
Posted on: 07 Aug 08 11:09
SSS
0 Agree

guest
No longer with us
Posted on: 09 Aug 08 07:24
complications are there but usefull
0 Agree

guest
No longer with us
Posted on: 11 Aug 08 15:16
Please can someone tell me if our regular DVD's will play on a Blu-ray player?
0 Agree

Blu-rayFreak
MyCE Resident
Posted on: 11 Aug 08 16:08
Yes, your regular DVD's will play on a Blu-ray player... All you have to do is read the box.
0 Agree

guest
No longer with us
Posted on: 14 Oct 08 08:23
Please tell me if our regular DVD's will play on a Blu-ray player?
0 Agree

guest
No longer with us
Posted on: 14 Oct 08 11:29
what happens if blu ray goes defunct...will hd dvd come back. I need to know ASAP
0 Agree

guest
No longer with us
Posted on: 16 Nov 08 19:14
no tp mamy nowy format, tylko po co ten podzia? na 3 strefy?
0 Agree

guest
No longer with us
Posted on: 30 Nov 08 18:11
Storage capacity is a very big deal. Especially when your talking about a 66% increase. This means longer movies can fit on the disk or a smaller compression ratio (better picture quality) for the same content. I hate changing disks on my laser disk player...... As far as data storage goes, the added capacity means less disks for backups, bigger games etc.. and a longer time before we have to upgrade to X-RAY disks or whatever. On a side note. I am looking forward to the advantages Blue ray can bring once it is adoped. For tv shows I dont really see an advantage to high definition over dvd. But, blue ray being able to also use the same data format as dvd means that we can now have an entire season of a telivision show in DVD quality on one disk. Much more convienent for the consumer and cheaper to produce in packaging and number of disks. With upscaling players, the quality will be better than standard DVD also. All those chages that George lucas made to the Star Wars series is not a problem. You can store all the different versions and switch between them on the fly to see the differences. The possibilities are endless.
0 Agree

rustmag
New on Forum
Posted on: 23 Dec 08 17:19
I bought my wife an HD DVD movie for Christmas thinking that she could view it on our regular DVD player until we could afford an HD player. Was I wrong? Also, Will a Blue Ray disc play on a regular DVD player? Finally, if the answer to the above questions are yes, will the viewing quality be as good as watching a regular DVD?
0 Agree

guest
No longer with us
Posted on: 14 Mar 09 19:24
Hi everyone. Your parents, they give you your life, but then they try to give you their life. I am from Turkey and too bad know English, give please true I wrote the following sentence: "Instant access to reservations information for airlines." Regards Salvia.
0 Agree

guest
No longer with us
Posted on: 11 May 09 15:55
that was a good assignment. i think whoever wrote that is the best.
0 Agree

guest
No longer with us
Posted on: 11 May 09 15:57
i wish i was smart as you are...............................................hahhahahaahahahahhaahahahahahahahhahahah ahahahahahahahha but i'm not too bad...........'''''''''''''
0 Agree

WarJarrett
New Member
Posted on: 18 Sep 12 05:41
The picture quality of HD-DVD vs. Blu-Ray is the implied topic title here, so I wish to take this thread into this comparison. It is extremely obvious in both of my video systems that HD-DVD offered much superior picture quality when compared directly to Blu-Ray. Colors are brighter, subtle textures are more vividly displayed, facial features (like wrinkles and eye color) are more detailed, and the overall picture appears to be more 3-dimensional. Overall, two copies of the same movie (recorded in the two different formats) played on an Oppo Blue-Ray player vs. on a Toshiba or Integra HD-DVD player causes me tremendous disappointment that the superior video quality was tossed-out, so that now only the inferior Sony picture is our standard. I suggest that anyone TRULY interested in watching high quality picture in their video system, buy a used HD-DVD player and find titles on Ebay. For rentals and for new releases, of course you need to also keep your Blu-Ray player. But for REALLY enjoying the quality of High Definition, HD-DVD is a real pleasure, as far above Blu-Ray as Blu-Ray is above standard DVD. By the way, my two systems are playing both formats onto a Sony 52" LED and both formats onto a JVC projector / Stewart screen.
0 Agree

Romphotog
MyCE Junior Member
Posted on: 29 Sep 12 00:36
The point of this thread is moot. Toshiba killed HD-DVD, blu-ray won. Deal with it.
0 Agree

WarJarrett
New Member
Posted on: 30 Sep 12 07:49
The point is that if you really want to see how beautiful a picture is possible with the expensive video system you own, blu-ray just will not show it to you. If you don't care, then yes its "moot". If you DO care, then I suggest you buy a used HD-DVD player and some of the classic/great movies on ebay, very cheap now. My point is that the difference in quality is astounding.

Is there anything else to watch as beautiful as HD-DVD? And why didn't anyone tell us about this at the time the two formats were supposedly being compared?
0 Agree

coolcolors
MyCE Resident
Posted on: 30 Sep 12 13:44
Quote:
Originally Posted by WarJarrett
The point is that if you really want to see how beautiful a picture is possible with the expensive video system you own, blu-ray just will not show it to you. If you don't care, then yes its "moot". If you DO care, then I suggest you buy a used HD-DVD player and some of the classic/great movies on ebay, very cheap now. My point is that the difference in quality is astounding.

Is there anything else to watch as beautiful as HD-DVD? And why didn't anyone tell us about this at the time the two formats were supposedly being compared?

Someone here needs a reality check HD-DVD is gone and dreaming of it being better or not isn't going to bring it back. Who in their right mind is going to spend money on dead format "Dead". Whether we care or not it's a "DEAD" format so just leave it at there unless you want to get more flak from users whom will tell you that that format is no longer unusable or worth the money spent to buy it and the media. You want it then do yourself a favor and just buy it and give to the rest of us free of charge then and see how long you support it. Otherwise you are starting to sound more like a propaganda machine that is stuck in a feedback loop-arguing for a media format that has no real value anymore-in hopes of bringing it back.
0 Agree

Romphotog
MyCE Junior Member
Posted on: 07 Oct 12 16:44
Quote:
Originally Posted by coolcolors
arguing for a media format that has no real value anymore-in hopes of bringing it back.
Beta was in fact better quality than VHS;however, VHS won because it had 3 speeds. Records play at higher KHZ than CDs, sound more real, and had awesome sleave art, but CDs won.
8-track was bigger, better sound than audio tape, but audio cassettes won out.
ZIP disks are hard, dont scratch, and were easier to put into pocket than CDs, but CDs won.

Why America still uses F instead of C, miles instead of kilometers, pounds, inches, feet, and why on Earth is Sunday the 1st day of the week? Go figure?!
0 Agree

ChristineBCW
CE Freak
Posted on: 07 Oct 12 17:10
Quote:
Originally Posted by Romphotog
Why America still uses...miles instead of kilometers...
The Americans were the first gov't to express interest in adopting Kilometers, by the way, in the late 1780s when the Méchain-Delambre Project was first discussed by America's closest allies, the French. That George Washington fellow thought it was a good idea.

Then the French Revolution arrived and both Méchain and Delambre were in various states of denunciation, and it wasn't certain if they'd keep their heads, much less publish their final works. The Americans' interest level stalled, and the British Mile was left in place.

In 1812, another set of reasons to be anti-British popped up and, if Napolean had remembered his frozen tootsies as a boy and planned out his Russian excursions more carefully, the Americans might have re-energized their interest in the Kilometer Project.

Instead, the Americans were still careful about adopting the 'worldwide measurement system' and decided to take some baby-steps with Napolean. They offered him money and some military distractions for the English and Spanish in exchange for a bit o' North American acreage. In miles.

(And yes, none of this explains why Teddy's interest stalled ("You must ask Congress and their monopoly friends!"), why Woodrow Wilson's interest stalled and that, despite Detroit's willingness to paint up speedometers, there are still inches and miles.)

We do know that Sony paid off studios and rightsholder-warehouses to only use their patented BluRay standards. So now we all pay Sony some license fee. What a wonderful thing, eh?

(Great book, by the way - THE MEASURE OF ALL THINGS. Ken Adler.)
0 Agree

platinumsword
Senior Moderator
Posted on: 07 Oct 12 17:24
Regardless, 1080p resolutions will be moot in the coming years. Next up 4k resolution and 8k in the short distance future.

0 Agree

DrageMester
Retired Moderator
Posted on: 07 Oct 12 18:18
Quote:
Originally Posted by platinumsword
Regardless, 1080p resolutions will be mute in the coming years.
Does that mean we will lose audio on all HD content?
0 Agree

Albert
Senior Moderator
Posted on: 07 Oct 12 18:34
Quote:
Originally Posted by DrageMester
Does that mean we will lose audio on all HD content?
Our eyes will be assaulted with such visual clarity that having audio would be a moot addition.



"moot" really is one of those infrequently used words that may transmogrify into another, more frequently used word without notice.
0 Agree

yojimbo197
MyCE Resident
Posted on: 07 Oct 12 19:02
Quote:
Originally Posted by Romphotog
Beta was in fact better quality than VHS;however, VHS won because it had 3 speeds. Records play at higher KHZ than CDs, sound more real, and had awesome sleave art, but CDs won.
8-track was bigger, better sound than audio tape, but audio cassettes won out.
ZIP disks are hard, dont scratch, and were easier to put into pocket than CDs, but CDs won.

Why America still uses F instead of C, miles instead of kilometers, pounds, inches, feet, and why on Earth is Sunday the 1st day of the week? Go figure?!
VHS was also adopted early on by the porn industry. Lot o' money in them thar tapes....

Zip disk/drive sucked. I got the "click of death"syndrome from multiple zip drives. Also, Zip disks were expensive. Thank goodness CD-R's and writeable drives came down in prices.

When I was a kid we learned the metric system, because supposedly the US was switching to the metric system. And I remember seeing distance signs with miles and km's on them. Then it all just went away....
0 Agree

platinumsword
Senior Moderator
Posted on: 07 Oct 12 19:05
Opps, fixed my wording.

To busy trying to prep a Turkey for cooking.

0 Agree

coolcolors
MyCE Resident
Posted on: 08 Oct 12 02:14
Quote:
Originally Posted by Romphotog
Beta was in fact better quality than VHS;however, VHS won because it had 3 speeds. Records play at higher KHZ than CDs, sound more real, and had awesome sleave art, but CDs won.
8-track was bigger, better sound than audio tape, but audio cassettes won out.
Really beating a dead horse won't make it run faster....just face the REALITY the format wars is over for VHS/Beta so either live with it or just don't use it. That is your choice...

Quote:
Originally Posted by Romphotog
ZIP disks are hard, dont scratch, and were easier to put into pocket than CDs, but CDs won.
Couldn't be more wrong! They are bulky and none standard format and you need to have a external drive that is itself is bulky and ZIP disk are proprietary format and Flash or Memory stick can do more and store more then ZIP disk. CD are more universal to everyone around the world and ZIP was only in limited markets thus meant it would die a slow death. Can you read a CD in a ZIP drive?? NO. But you can surely read a CD in a DVD drive and BD drive...funny how you seem to miss that point..of technology advancement.

Quote:
Originally Posted by Romphotog
Why America still uses F instead of C, miles instead of kilometers, pounds, inches, feet, and why on Earth is Sunday the 1st day of the week? Go figure?!
Well put this way that how history was they devised their own methods and it was partially related to politics from that day in the past. Well if you want to know more you do know they have Libraries and they do have History books probably related to all your questions there. So just arguing for arguments sack does history no serve go and look up those historical facts.
0 Agree

Steve33
Moderator
Posted on: 08 Oct 12 04:13
8 track was the worst format ever imagined.

HD DVD is dead.
It doesn't matter how good or bad it is, it is dead and a money pit if the player needs repairing.
Whoever wants to pursue getting obsolete equipment and discs, go ahead but don't try to get the rest of us to.

People still enjoy LPs, cassettes, 8 tracks?not likely, vhs, beta but they are all dying formats and there is no going back to them in mass.
I've still got some of these but no way I am going around telling folk, "lets go back".

On the other hand, just to mention dvds and blu-rays...the burning of them and playing them is thought of as "old fashioned" in some quarters.....
0 Agree

lost-soul
New Member
Posted on: 06 Oct 14 13:38
I myself have never gotten the big deal about Blu-ray I use a 40 inch flat screen; its 1080p and have played HD and Blu ray. I stick with HD and get Blu-ray as needed guess I am not picky . .
0 Agree

lost-soul
New Member
Posted on: 06 Oct 14 13:42
" On the other hand, just to mention dvds and blu-rays...the burning of them and playing them is thought of as "old fashioned" in some quarters..... "

Slow down big guy; if dvds and blu-rays are oldfashioned whats next its not streaming that has always been my last choice; always looks lousy on my big flat screen ; i' ll keep my HD dvds .
0 Agree

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