25. August 2006

DVD-Rs are Evil

» Deutsch

grrr

Did you ever wonder what the difference between DVD-R and DVD+R is? Each time I was buying blank DVDs I wondered… and then ignored it. Both standards are equally expensive and my DVD writer can write both.

Copy protection ring

This week, I had to write a DVD for a project delivery. I opened a fresh pack of blank DVDs and examined them a bit closer than usual. I noticed a strange ring on the data layer. At first I thought of a fault in the material and was quite frustrated with the thought of trashing all those DVDs.

Then I decided to ask the Internet first – and found out I was wrong. This strange ring is a copy protection. It is a small area where the encryption keys of video DVDs are stored. On DVD-Rs, this area is pre-recorded, so you can’t copy this key.

It’s not a bug, it’s a feature.

Identification code and higher production costs

There is no such limitation on DVD+Rs. DVD+R writers also do not write an unique identification code on the DVDs, like DVD-R writers do.

Producing DVD-Rs is also more expensive than producing DVD+Rs. The copy protection ring and another unique identification number have to be written on each DVD. This takes more time and therefore results in higher costs. Additionally, DVD-R producers have to pay more license fees to the DVD-Forum.

There are no real big disadvantages for DVD+Rs. DVD+R is not supported by the official DVD-Forum, so these DVDs are not allowed to carry the official DVD logo. Since this great DVD-Forum is also responsible for the limitations on DVD-Rs, the infamous region codes and CSS copy protection on video DVDs, this does not appear to be much of a loss. It’s also not a problem for compatibility – both types are about equally compatible to standalone players.

To make it short: DVD-R is evil and has only disadvantages compared to DVD+R.

Update 26.8.2006

Commenters here and at reddit.com said that DVD+R are less compatible to standalone players. According to the German c’t magazine, the difference is marginal:

At the last test, 93 percent of the DVD players worked with DVD+R. That’s 2 percent less than with DVD-R. Using a ‘compatibility tool’ to change the bit for media identification to DVD-ROM, both formats were equally recognized by 95 percent of the players.

(translation by me)

Update 26.8.2006, II

Sorry for posting yet another update, but I feel I need to clarify something: Many postings that refer to me indicate that I propose DVD+R because you can copy original video DVDs with it. That is not the case.

In fact, most DVDs are simply too big to copy on a single layer DVD anyway. It is also very likely that there are additional copy protection mechanisms in the firmware of your DVD writer, so that it’ll refuse to copy DVDs on DVD+R even though it would be physically possible. (Haven’t tried, yet. If anyone did, please leave a comment)

My point is more an idealistic one: The DVD-R has intentionally been limited in its capabilities just to make the movie industry happy. Not only was this little successful – we all know how easy it is to completely strip the copy protection off a DVD – it also made the process of producing them more complicated. Additionally, those identification codes are yet another unnecessary privacy invasion.

That is why I think that DVD-Rs are morally inferior to DVD+R. In practice, the difference isn’t that big.

Topics: blankscomparisoncopy_protectionDVDDVD+RDVD-RDVD±R

18 Comments »

  1. Unfortunately DVD-R came first and that’s where all DVD players started. Compatibility was added later for DVD+R but the design was meant to work with DVD-Rs. It has been observed that in older DVD playing devices (such as the Playstation 2), DVD-Rs do perform better than DVD+Rs from read speed to compatibility.

    My own anecdotal evidence is that my PS2 when reading a DVD+R disc whines like a dremel and doesn’t when playing a DVD-R disc.

    Comment by kaindragoon — 25. August 2006 @ 20:45

  2. I had no idea. I always bought DVD-R discs for no particular reason, but now I think I will stay away.

    Its interesting that they are putting copy control technology in a medium used for copying.

    Comment by directionzero — 25. August 2006 @ 20:51

  3. Originally, videos recorded on DVD-R would play on more stand-alone (non-computer) players than DVD-RW. Less of an issue now, but still DVD-R is the more compatible choice when making video DVDs.

    Comment by Linda Pelfrey — 25. August 2006 @ 21:37

  4. I’m under the impression that DVD-R’s tend to be more compatible with the wide range of (standalone, not computer) DVD players out there. So while I agree with your sentiments about the problems with DVD-R, the choice is not always so clear.

    Comment by Kyle Cordes — 25. August 2006 @ 21:46

  5. The consumer DVD players in my house all play my DVD-R recorded video, but not all play DVD+R. Therefore, whether or not DVD-R is evil, to me it has the most important advantage over DVD+R – playability.

    Comment by PirateJohn — 25. August 2006 @ 21:47

  6. Can you post the sites where you got your information? Saying that your “asked the Internet” isn’t very helpful in verifying your claims.

    Comment by unconvinced — 25. August 2006 @ 22:01

  7. Thanks for your compatibility reports. :)

    I got my information from German sources, so I didn’t originally include them in the article because they wouldn’t be much use for english readers.

    The German c’t magazine came to the conclusion that the difference in compatibility is marginal (95% vs 93%). I updated the article with a translated quote.

    My second source was the German Wikipedia.

    You can find similar information at multiple locations if you search the net for it.

    Comment by Flo — 26. August 2006 @ 0:13

  8. Some people claim DVD-R is preferable for recording video and DVD+R is better for recording other data (e.g. hard drive backup).

    Comment by sjk — 26. August 2006 @ 1:26

  9. Thanks ! This is very useful. Always had this question whenever I went to buy empty DVDs. However, was too lasy to look up on the new. Anyway, you have convinced me to buy DVD+Rs

    Comment by Venkataramanan S — 26. August 2006 @ 6:58

  10. I have used dvd+r and dvd-r and have no compatiblity problems with any of my many players

    Comment by Victor Flabatar — 26. August 2006 @ 11:43

  11. Originally there was only one recordable DVD format (now called “authoring”). Its intended use was DVD authoring and it was quite expensive partly due to the requirement for a different write laser. When a consumer recordable format was inevitable, Pioneer developed a new DVD-R format that used a different dye to eliminate the need for a second laser, but they had to protect the investment in the old standard by disabling the ability to author DVDs. That’s what the “ring” referenced is. It is of no special consequence to home users and the claim that it somehow makes DVD-R evil is absurd. Anyone who wishes to copy DVDs removes copy protection anyway and has no need for the disabled area.

    As far as production costs go, what does it matter? All that matters is how much you pay. For a very long time, DVD-R was substantially less expensive by virtue of its headstart in the market.

    Ultimately, all this amounts to is an ignorant rant.

    Comment by craig — 26. August 2006 @ 17:47

  12. craig, thanks for the history insight. It doesn’t affect my point, though. DVD-R is still arbitrarily limited.

    You might argue about my choice of words (“evil” was not meant in any religious sense), but I still think that artificially limiting a format isn’t exactly friendly towards the customers.

    Besides, only caring about the price in the store is a little short-sighted. This teaches the industry that they can cripple products as long as they are still cheap enough… and has some more problematic implications with other products (child labor, for example).

    Comment by Flo — 26. August 2006 @ 18:57

  13. My Pioneer TIVo DVD recorder won’t write to +R format. No explanation given in the
    manual, just that -R must be used.
    Now I know why.

    Comment by Larry — 27. August 2006 @ 15:52

  14. Look I asked about that +-r thing too-
    someone at office depot told me +rs burn and
    read from the inside-out,and -rs from the outside-in.I thought that was the only difference.by the way all discs need some
    kind of info on them so that dvd drives
    can I.D. them.

    Comment by Brandon — 29. August 2006 @ 2:42

  15. Sorry for your time…. Why i can’t see images on this resource?
    My Browser is: Opera.
    Thank you.

    Comment by Green_Monkey23 — 13. October 2006 @ 22:30

  16. What resource?

    I also use Opera and have no problems viewing my site.

    Comment by Flo — 13. October 2006 @ 22:42

  17. Hallo! ;)
    wow… what crazy newz!
    what do you suppose about it?

    Comment by chikalew — 4. February 2007 @ 18:05

  18. Hey thanks for the info…I just bought a stack of Memorex DVD-R but took them back cuz the copyright protection, then got some Compusa DVD-R and now have to take them back too. I compared the -R to the +R and noticed the RING. But thanks cuz I was worried I couldn’t burn movies anymore.

    Comment by Kevin — 5. July 2007 @ 0:08

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