Talk:DVD

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[edit] Paper disk and "fool proof security"

The artical claims that the HD paper disk can be cut and recycled and therefor be totally secure, Mabey this disk is different but data recovery off of floppy disks that have been cut up or broken CD's has been going on for a long time. plus the paper disk artical doesn't make this claim. I think at this point no one know if data recovery off a cut/shattered disks will be possible and that claim should be removed. 67.160.55.104 22:59, 26 May 2007 (UTC)

[edit] History add on

When was the first dvd released, and which film was it? When was the first dvd player availble in the shops?

I also find it strange that this is not in the article. According to http://standartdvd.com/, limited USA launch was August 1997, with the full launch in 1998, month not specified. The mention of launch date should include the five test market cities: Dallas, Philadelphia, Portland, Richmond, San Francisco -- 67.64.66.99 15:18, 23 July 2007 (UTC)

The only mention I have been able to find is a post in the film-talk.com's forums which suggests that "Tropical Rainforest", "Africa: The Serengeti", "Antartica", and "Animation Greats" were the first titles to be released by distributor Lumivision.--68.162.73.44 12:16, 10 November 2007 (UTC)

[edit] DVD region code

This article doesn't link to DVD region code anywhere...it really should. --Stlemur 12:02, 18 June 2007 (UTC)

DVD region coding is a feature of the DVD-Video format, and is linked to in that article. This article is only about the physical media, not the video storage format usually used on it. -- Yukichigai 18:53, 18 June 2007 (UTC)

[edit] Who?

Who invented DVD's? Don't you think that should be in this?

[edit] So, how does it work?

Don't you think that should be in the article pretty prominently? I shouldn't have to go to External links or the infobox to hunt for a germane link. --zenohockey 17:21, 19 August 2007 (UTC)

[edit] How about a reliability/life span section?

When I asked a certain filmmaker about whether reliable burned DVDs exist, I got the following response: "There's no such thing as a reliable burned DVD - it's a problem inherent to the format. The ones you buy in stores aren't that reliable either! You can get DVDs of your work professionally pressed/stamped, for about $2000 for 1000 of them, you can't buy less, those are as good as what you get in stores.

Really, the best way to make sure your data will still be reliable later is to make lots of copies of it, and keep doing so for years and years if you still need the data later. By torrenting my discs and sending them out to lots of people, I can guarantee that copies of the discs will still work for as long as the DVD format itself has been forgotten in favor of what's next ... which I hope is more reliable!"

So... I went to wikipedia expecting to find some kind of info about this, only to see that there was absolutely nothing. It seems strange to me, seeing that this is an issue of paramount importance to people who use DVDs for storing information. Esn 02:34, 25 September 2007 (UTC)

Hmm, I see that there is a CD rot article which also talks about DVD rot. This should probably be mentioned here... Esn 02:48, 25 September 2007 (UTC)

Ok, I've done a cursory Google search and started a crappy section under the "Longevity" name. It's very bad right now, but I think that it's absolutely essential. It beats me how this article was approved for Version 1.0 without it. Esn 03:06, 25 September 2007 (UTC)

Your filmmaker friend seams to be a little cynical, perhaps he has been unlucky. There have been plenty of studies done demonstrating that burned DVD's have a pretty good life span. It should also be made clear, that these are only problems with recordable DVD. --Ray andrew 04:26, 25 September 2007 (UTC)

Yes, but instead of making that clear, you deleted the whole section. Esn 08:03, 25 September 2007 (UTC)

I don't have time to edit poorly thought out and sourced contributions. --Ray andrew 12:44, 26 September 2007 (UTC)

Why is there no place on Wikipedia that will just give a concrete longevity NUMBER? Is it just indefinite, or is there a terminal melting date? As the Philips engineer said, "rot is isolated" so that topic is a red herring.

Ray andrew: Isn't this what flagging an article is for? Bring the attention to the problem, and if you don't have time to sort it out yourself, let the rest of the community deal with it. 24.76.147.217 (talk) 04:28, 28 February 2008 (UTC)

Reliability and Longevity are huge and major issues for DVD and CDs and storage media generally. There isn't a rankign of what is reliable on wikipedia and there definitely should be. The truth is that DVDs are not much better than magnetic tape and failure within 2-4 years is the norm. The more reliable thing are HDDs. People need to know this. stop squibbling amongst yourselves and get a section up so people can contribute.

[edit] First DVD

If it's known, someone should add what the first title released on DVD was (the same way that the VHS article mentiones the first title released on VHS). TJ Spyke 01:49, 18 December 2007 (UTC)

The first DVD release was Twister. Source: [1] --81.158.130.85 (talk) 11:59, 26 March 2008 (UTC)

[edit] Missing wikibook

If someone knows what happened to this book linked to on the right, please update the link, otherwise it should be deleted from the article. patsw (talk) 19:49, 2 January 2008 (UTC)

[edit] "Etymology"

I am loath to shirk convention, but can an acronym have an etymology? --VKokielov (talk) 06:11, 26 January 2008 (UTC)

[edit] Speed messup?

Major inconsistencies in the Speed section. It seems the author has appeared to ignore the Wikipedia standards regarding SI and binary prefixes.

ie: 1.32MiB=~1350KiB *1024=1382400Bytes *8=11059200bits /1024=10800 "kebibits" /1024=~10.55 "Mebibits"

As far as I know, the only times binary (rather than SI) prefixes (prefices?) have been used in terms of bits has been for the capacity of solid-state Memory (eg a 64 "Mebibit" chip), whereas in data rates kilobits are used (eg 128kbits/sec=128000 bits/sec).

It also seems that the author has mistaken the 1350kB/sec speed from the previous section, for a binary kilobyte value.

Thus, the actual data rates may be closer to: 1.35MB/s=1350kB/s=10800kb/s=10.8Mb/s

Making the associated binary values: 1.29MiB/s=10800000b/s=10.3Mib/s

Since these are recording data rates I would suggest that the SI prefixes be used for the bitrates, and either or both SI and binary for the byterates.

Since I have no independent verification of the actual bitrates 1x is defined at (the value listed in the Technology section seems to be contradictory to the source it referenced in DVD FAQ Section 4.2), I decided against editing the table. It may be notable that 1350KiB/s is exactly 9x CD Speed (150KiB/s).

24.78.129.157 (talk) 07:18, 26 January 2008 (UTC)

Hopefully corrected correctly.

“

Note that for CD drives, 1× means 153.6 kB/s (150 KiB/s), 9 times slower.†The CD-ROM article doesn’t agree, it says 150 kB/s. — Christoph Päper 13:23, 13 March 2008 (UTC)

CD-ROM article was wrong. It should be as is here. Look at Red Book (audio CD standard). ArivaldH (talk) 17:04, 26 June 2008 (UTC)

[edit] BluRay not part of the DVD spec, therefore shouldn't be mentioned to the See Also tag.

If there was a Need to add BluRay in the "See Also" Section, maybe we should add VideoCD and SuperVideoCD.

Actually, as I don't believe VideoCD should be added, I believe that BluRay should be removed, too, as it uses totally incompatible technology with DVD's official successor, HD-DVD, which in turn has extreme similarities to DVD structure.

Please, keep the removal of BluRay I did and let BluRay at the "rivals" section. —Preceding unsigned comment added by Makrisj (talk • contribs) 21:55, 3 February 2008 (UTC)

[edit] Forgive me... I'm a bit confused here...

so what year was the exact year that DVDs went on sale for home use? 24.192.136.238 (talk) 03:48, 19 February 2008 (UTC)

I'd like to know too. I think it was 1997 for the US, but have no specific proof. I first saw them in 1998 in the UK (Jumanji and Queen's Greatest Hits were some of the first I saw).

Also, what about the first DVD-video player and first DVD-ROM drive? I remember seeing DVD-ROM drives sold by Creative in late 1997 or early 1998, and I recall T3 magazine saying the frist DVD video player was some Onkyo model in 1996 (possibly only sold in Japan) - I think I still have that magazine somewhere... --Zilog Jones (talk) 15:10, 12 March 2008 (UTC)

Actually, I just remembered I definately have magazines reviewing the first DVD video player sold in the UK at least. It was some Panasonic model that came out around Spring 1998. I'll look when I get home if I remember! --Zilog Jones (talk) 15:13, 12 March 2008 (UTC)

Thanks for the info, whether or not it is accurate! =) --24.192.136.238 (talk) 01:04, 20 March 2008 (UTC)

Ok, there's been some recent back-and-forth fighting over "1995 introductions" and "1996 introductions" in the categories list at the bottom of the article. I haven't been a part of the edit war, but I believe the difference in opinion may center around whether someone is looking at the DVD specification or at the introduction of DVD technology to the marketplace. As mentioned in this wikipedia article, the DVD specification was finalized in December of 1995. The DVD Faq at dvddemystified.com (a source for portions of the article) says that "the first players appeared in Japan in November, 1996, followed by U.S. players in March, 1997..."
Technically, I believe the proper category at the bottom of the article should be "1995 introductions" because the subject of this article is the format, not the related commercial products. I have taken the liberty of adding "1996 introductions" and "1997 introductions" to the categories list for DVD Player, and of changing the category list for this article to read "1995 introductions". If anyone disagrees with this, please comment here... I am not trying to insert myself into an edit war.
Fishbert (talk) 00:34, 26 April 2008 (UTC)

If a reliable source supports it, and is posted here, I'm ok with 1995. What you were seeing wasn't actually an edit war, but some systematic vandalism by one user on multiple video format related pages, in one other cases they changed introductory dates of formats by 10 years. 3 IPs and 1 user named were blocked, and this page had to be semi protected. They refused to provide sources, and continued making unsourced changes without edit summaries. Hope that helps! AtaruMoroboshi (talk) 12:47, 26 April 2008 (UTC)

A lot of people go for quick-n-dirty edits, not bothering to look at discussion pages or write explanations for what they are doing. I didn't know anything about ties to other, more extreme edits... I just came in, saw a tennis match of sorts over that small bit of info, and figured there were two strong opinions butting heads, which got me curious about the whole thing. Whether it was someone pushing an honest (but lazy) change or just accidentally-correct vandalism, perhaps it will be left alone now.

Fishbert (talk) 08:35, 27 April 2008 (UTC)

[edit] DVD and Blu-ray not the same.

DVD and Blu-ray aren't the same and I see many people on different web sites and news article refer to Blu-ray as a "Blu-ray DVD" or something very similar. In the FAQ section of the Blu-ray web site or even going to Sony's Blu-ray web site, the correct acronym for Blu-ray is simply "BD." Information on this can also be found on the Blu-ray Disc Association web site. (blu-raydisc.com) Just to make a better case they have referred to the different discs as BD-ROM, BD-R, and BD-RE. So to conclude, to avoid confusion between Digital Versatile Disc and Blu-ray, it is really as different as DVD and BD. Since it's one less letter, it's even quicker to say. LOL  :-) Dchagwood (talk) 19:37, 25 February 2008 (UTC)

[edit] Sector size

What is the area of each sector in square nanometres?Anwar (talk) 14:52, 4 May 2008 (UTC)

[edit] Double side DVDs omitted ?

Double sided discs are not even mentioned in the article. --Xerces8 (talk) 10:31, 9 May 2008 (UTC)

[edit] Mistakes & omissions in the table "Capacity differences of writable DVD formats"

The table labeled "Capacity differences of writable DVD formats" reports these numbers for the capacity of Single Layer DVDs:

 DVD-R: 2,298,496 sectors
        4,707,319,808 bytes

However, the Optical Storage Technology Association (OSTA), which represents most manufacturers of optical storage products, posts these numbers at http://www.osta.org/technology/dvdqa/dvdqa6.htm:

 DVD-R: 2,294,922 sectors
        4,700,000,000 bytes

For DVD+R, this article exactly matches the OSTA numbers.

In addition, this table omits the numbers for:

 DVD-RW (OSTA reports numbers which exactly match DVD-R)

 DVD+RW (OSTA reports numbers which exactly match their numbers for DVD+R)

 DVD-RAM: 2,295,072 sectors (from OSTA)
          4,700,307,456 bytes (from OSTA)

I recommend:

 1) Checking the numbers in this table again.
 2) Listing http://www.osta.org/technology/dvdqa/dvdqa6.htm as a reference.

Thank you,

David.J.Lambert (talk) 22:04, 24 May 2008 (UTC)

Regarding the DVD-R size: It appears that unfortunately, you went directly for the table on the OSTA web site without reading the immediate sentence in front of it, quote:

Consequently, real world capacity can vary slightly among discs from different media manufacturers although many have informally settled on 2,298,496 sectors (4,707,319,808 bytes) for a DVD-R (General) 4.7 GB disc.

– Ylai (talk) 09:17, 13 November 2008 (UTC)

[edit] Density of Data on DVD

Gboycolor edited this article:

However this do not seem right:
DVD-18:
2 sides with radius of 60mm (6cm²) make less than 113cm² of space on each size. Giving less than 126cm² (I count inner circle also).
So it would mean that DVD-18 holds not more than 126 * 18 = 2268MiB. Isn't it wrong? It must be about 8 times more... ArivaldH (talk) 17:10, 26 June 2008 (UTC)

[edit] expansion needed

Has been over 6 months on expansion page. Been moved to talk page. Please expand soon. Vinh1000 (talk) 19:23, 15 July 2008 (UTC)

[edit] Converting a CD drive to read DVDs

metacafe videos and blog posts aren't reliable sources, and the material was presented in too prescriptive a manner. Should more reliable sources be found, the following text would be a good way of phrasing the issue:

Chris Cunningham (not at work) - talk 21:21, 15 July 2008 (UTC)

[edit] Difference B/W a DVD-ROM and DVD-ROM drive???

there should be a clear difference between a dvd rom and a dvd rom drive....... most of the people confuses dvd rom drive with dvd rom.in actual what we call a dvd is a dvd rom i.e dvd read only memory. and the device whichreads our dvd rom is called dvd rom drive!!! it should be noted that dvd and dvd rom are the same things while dvd rom drive is different.... —Preceding unsigned comment added by Chaudharybilal (talk • contribs) 17:33, 22 August 2008 (UTC)

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[edit] DVD drive speeds

The table in the article only shows the top speed (which is only achieved et the outer end of the DVD). It seems to use this top speed (instead of the average speed) to calculate the burn time which obviously results in unrealistically short burn times. Perhaps someone can fix this to use the average speed and find realistic burn times? 78.53.209.68 (talk) 07:33, 8 October 2008 (UTC)

[edit] Why does the Blueray section belong here at all?

Why not a see-also? Later, once we see what is ACTUALLY happening, then add a transition section? At the moment, here is a LOT of speculation and some PoV. sinneed (talk) 04:13, 20 November 2008 (UTC)

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