Myce.com Latest Updates

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
seƤoig 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

Post your comment

Myce.com settings

Several settings at Myce.com can be changed, they are stored in cookies, which means they will be reset if you clear Myce.com cookies

Background

Change the background to a plain color or trianglified image (similar to the default image)

No tracking features

At Myce most social media feature are done server side and impose no privacy risk to the visitor when not used. Several features use Javascript with you can turn off here

Layout

Switch to the List layout for an index with chronologycally listed news items or Grid layout for a block based layout. To see the change you need to reload the page

×