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A CD recorder is a computer peripheral that writes data to a CD disk. There are two main types -- CD-R and CD-RW. CD-R is CD-Recordable. CD-RW is CD-Rewritable.
CD recorders are also known as CD burners. To record a CD is often called burning a CD.
-How come the normal CDs with things already written on them are all smooth on the "burned surface", when CD-Rs have a sharp mark of where the writing has ended?( Henningklevjer 17:38, 20 April 2006 (UTC))
-I thought the 650MB CD-R stored 650MiB, not 650000000B: 333000sectors * 2048bytes/sector / 1024 / 1024 = 650.390625. see http://www.cdrfaq.org/faq07.html#S7-6.
-Yeah, me too. CD-Rs seem to be measured in MiB (though they say MB as just about nobody uses the term MiB, while DVD-Rs seem to be measured in GB (not GiB).
- Yep. The reason why it says MB on Dan100's CDs is because the MiB terminology has not been adopted anywhere in the industry, thus the "(though MB is printed on CDs as the binary prefixes haven't caught on in the industry)" I added to the article. (odd that you would change it back to MB but not change that).
So, I suppose it would be possible to refer to it as a 650MB CD (though confusing, and we want to eliminate as much of that as possible in an encyclopedia, right?), but the way it was before I edited it "650MB (not MiB)" was flat out wrong. Psxer 08:08, 7 Jan 2005 (UTC)
Wuh? CDs, like any other storage media, are measured in megabytes. As said, these 'MiBs' have "not caught on in the industry", and they certainly haven't outside it, either. Dan100 19:02, Jan 7, 2005 (UTC)
I mean, I kinda see where you're coming from, but the bottom line is that MB is the accepted and universally-used terminology, for all its faults. Dan100 19:22, Jan 7, 2005 (UTC)
Oh and it's madness to use "650.390625", as that rounds to 650. You would no more say "650.390625" rather than "650" than, when asked by a collegue how far you travel in to work each day, you would say "19.74673 km" instead of "20 km". Dan100 19:26, Jan 7, 2005 (UTC)
it isn't burning pits into the dye; it's changing the color of the dye to make it less reflective, right? - Omegatron 05:30, Jan 15, 2005 (UTC)
The dye isn't reflective... the reflective layer (usually silver or a silver alloy) is. You don't burn pits in a CD-R, you burn dark spots in the dye layer. These dark spots absorb the light from the laser in the CD player's pickup more than the unexposed areas of dye, and so the reflected light and the resulting signal goes down whenever the read laser encounters a burned mark. The effect on the returning laser signal is similar to what happens on a replicated CD... similar, but different.
A replicated CD has a track of pits that are molded into the disc. These pits are molded in clear plastic, and they are coated with a reflective layer of aluminum. Although aluminum has lower reflectivity than silver, there is no dye layer on a replicated CD, so very little laser light is absorbed. When the focused laser spot of the CD player's pickup encounters a pit the light is diffracted, and the reflected light is greatly reduced (and the resulting signal voltage goes down).
So, while CD-Rs have burned marks that absorb the light and CDs have pits that diffract the light, the effect is that recorded CD-Rs emulate replicated CDs, which is what they were designed to do.
Actually, a replicated CD has pits molded into it, but it is read from the underside through the 1.2 mm thick polycarbonate disc, so the laser is actually focused on a track of bumps. But the diffraction is the same. Now, some people will tell you that the optical effect is the phase cancellation of the light being reflected from the bottom of the pit (top of the bump), versus the light that is reflected from the land areas around the pit (since the read laser spot is twice as wide as the pits are), but at these geometries the physics can be understood as pure diffraction. Keep in mind that the pit geometries are a fraction of the laser wavelength. Tvaughan1 21:27, 18 August 2006 (UTC)
Compatibility of CD-R and conventional read-only discs, CD and CD-ROM, is a miraculous achievement which was made possible by the dye materials developed by Taiyo Yuden.
I like Taiyo Yuden, too, but I don't think we should ascribe divine powers to them. Perhaps it was merely a wondrous achievement? Stunning, maybe? Gob-stopping? -- 68.41.122.213 11:02, 13 December 2005 (UTC)
http://tech.msn.com/howto/article.aspx?cp-documentid=23697
From the above article: The problem is material degradation. Optical discs commonly used for burning, such as CD-R and CD-RW, have a recording surface consisting of a layer of dye that can be modified by heat to store data. The degradation process can result in the data "shifting" on the surface and thus becoming unreadable to the laser beam. "Many of the cheap burnable CDs available at discount stores have a life span of around two years," Gerecke says. "Some of the better-quality discs offer a longer life span, of a maximum of five years." Distinguishing high-quality burnable CDs from low-quality discs is difficult, he says, because few vendors use life span as a selling point.
From the Wiki page: Burned CD-Rs suffer from material degradation, just like most writeable media. Optical discs commonly used for burning, such CD-R and CD-RW have a recording surface consisting of a layer of dye that can be modified by heat to store data. The degradation process can result in the data "shifting" on the surface and thus becoming unreadable to the laser beam. Many of the cheap burnable CDs available at discount stores have a life span of around two years. Some of the higher quality discs offer a longer life span, of a maximum of five years. Distinguishing high-quality burnable CDs from low-quality discs is difficult, because few vendors use life span as a selling point. 65.118.253.68 18:09, 18 January 2006 (UTC)
calling something a miraculous achievement is certainly POV - a miracle is about as pov as you can get. 65.35.93.97 15:09, 20 February 2006 (UTC)
Does anybody know anything about CD+R? There's no article about it. Rt66lt 01:35, 4 March 2006 (UTC)
There is no such thing as CD+R... only CD-R. There is a "CD Plus", which is a multi-session CD with CD-Audio tracks in the first session and a CD-ROM track in the second session. Tvaughan1 21:13, 18 August 2006 (UTC)
I've used simple liquid disk washing detergent for 10 yrs. Cleans off sticky stuff, oils, and dirt. I always pat dry with a clean soft cloth.
. . . regarding "use a circular motion to remove all the toothpaste"; why circular when the previous instructions were to move in a radial direction ? - Sue 08:40, 14 August 2006 (UTC)
Just a question..... how do you put files onto a cd-r? I tried and all it said was, it is not compatible, it is not formatted..... How.....
"They use Eight-to-Fourteen Modulation, CIRC error correction plus the third error correction layer defined for CD-ROM. The first CD-Rs were produced in 1988"
CIRC linked to a disambiguation-page, so I changed the target page to the appropriate one, namely http://en.wikipedia.org/wiki/Cross-Interleaved_Reed-Solomon_Coding. 62.238.92.181 14:51, 18 April 2006 (UTC)
Deep scratches on the data side can interfere with the focus of the laser and render a disc unreadable.
is the above method of cleaning likely to damage a CD? it certainly seems effective at getting the grime off them. Plugwash 11:59, 22 May 2006 (UTC)
No, it is not likely to damage a CD as long as your t-shirt is clean (no dirt particles that could scratch the disc). Tvaughan1 21:15, 18 August 2006 (UTC)
My understanding was that most 80 minute CD-Rs in fact fully complied with the standard. The standard specified large tolerances due to the manufacturing tech at the time but as this improved, it became possible to make 80 minutes CD-Rs which fully complied with the standard but were obviously at the upper end of the tolerances. Perhaps what I've heard is wrong and tolerances and manufacturing tech doesn't actually allow 80 minutes CD-Rs to be produced which fully comply or they're mostly not fully compliant but if there is some truth to this story, e.g. tolerances and tech allow up to 78 minute fully complaint CDRs, we should make it clear this idea clear, that the tolerances were rather loose and better manufacturing tech allowed CD-Rs to be produced which only marginally broke the tolerances... Nil Einne 11:59, 26 May 2006 (UTC)
The part of this article containing facts about how to keep them clean doesn't sound right. Try to remove the second person (you).
The lede ends with this: "The CD-R retains all the abilities of the CD standard but adds the functionality of being able to store either music or data." I have plenty of regular CDs that contain music and data. Isn't the real distinguishing characteristic of CD-Rs that music and data can be recorded onto them? -- Rob Kennedy 07:27, 7 July 2006 (UTC)
You are both correct, depending on how you read the above statement. CD-R is a physical format. For the most part, the physical format is independent of the application format (CD-Audio, CD-ROM, CD-Interactive, etc.). I think the original author of the above sentence meant for the focus to be on the words "adds the ability to store", rather than on the words "either music or data". Perhaps if we substituted the word "record" for "store" and the word "content" for "either music or data", the phrase would be more accurate. Or perhaps we could simply say something like "The CD-R is designed to behave identically to a standard CD-Audio or CD-ROM which is mass replicated. However, the CD-R can be recorded by anyone with a CD-R recorder and a blank CD-R disc." Tvaughan1 22:28, 17 August 2006 (UTC)
Could someone add a section describing 'audio CD-R'? In the UK at least, most consumer audio cd writers are restricted to this type of disc so that a levy can be paid to the music publishers. Many users are confused about this.-- 137.205.146.206 09:20, 3 August 2006 (UTC) roger thorpe
It is true. Those audio CDs were charged at a premium and were only valid in CD recorders. — Preceding unsigned comment added by 77.101.103.91 ( talk) 17:36, 18 August 2016 (UTC)
According to a Maxell press release from 2002, burning CDs at or faster than 52X carries with it some risk.
“ | Maxell engineers determined that the minimal speed advantage offered by 52X drives is outweighed by the performance and safety issues of operating CD-R media in excess of 10,000 rpm. Research has shown that naturally occurring minute defects or cracks in the CD-R hub area can quickly expand when exposed to the physical stresses of 52X operations. These small, virtually undetectable defects can easily cause discs to break apart at 52X speed, destroying not only critical data stored on the CD-R media, but potentially damaging or destroying the CD drive. | ” |
If this is correct, maybe it should be incorporated into this article, somehow? Looking at Maxell's webpage, I see that the fastest CD-Rs they produce are still 48X ones... TerraFrost 17:04, 27 November 2006 (UTC)
There is nothing in article about any countries taxing CD-R as a way to combat music piracy. Germany, France, Italy, The Netherlands and Spain all have CD-R taxes and Canada is considering it. Jon513 14:10, 30 November 2006 (UTC)
"most markers can bleed-through the CD/DVD and destroy your data"
The article on disk care linked in this section contains related product advertisement ("Maxell Disc Writer Pen"). I am not sure if it would be considered indirect advertising. 124.168.184.54 10:25, 28 January 2007 (UTC)
I rewrote the paragraph on the writing process. Got rid of the repetition of the the term "burn"; removed phrase calling the dye layer "magnetic". I intentionally left it vague as to whether heating the dye causes a lowering or a raising of the reflectivity. Does anyone know for certain which it is? Spiel496 04:22, 17 February 2007 (UTC)
Why is that you can only put 80 minutes worth of music on a CD when the full capacity is 700mb? Seems like a waste. —The preceding unsigned comment was added by 70.48.32.149 ( talk) 01:12, 8 April 2007 (UTC).
In all the incredible techy detail here, everyone's rather overlooked the retail history of the CD-R format. All I can tell from this article is that the spec was published in 1988. Please someone expand the History section before adding even more geeky stuff. (And I say that as someone really interested in the geeky stuff!) 86.143.52.241 02:27, 3 June 2007 (UTC)
I'd like to add this information to the article, but I'm not sure how to do it. I will leave it up to someone more experienced than I. The following comes from Janis Ian, a former singer from the era of the 60s and 70s:
"Several years ago the music industry reached an agreement with CD manufacturers to receive a royalty on blank, recordable CDs to compensate for the effects of copying music. The recording industry is receiving a royalty for the "Audio" CD so that it can be used for copying music, taking that money, and then turning around and complaining that the CD is being used to make "unauthorized" copies. Now what is up with that? - http://www.janisian.com/article-internet_debacle.html and http://www.janisian.com/articles-perfsong/Fallout%20-%20rev%2011-23-05.pdf - Theaveng 17:44, 31 August 2007 (UTC)
"Burn speed can also affect the compatibility due to poorer pit definition on disks burnt at high speed, selecting the slowest supported speed for the burner/media combination is strongly recommended when burning audio CDs, to maximize compatibility."
Is this accurate? Does burn speed really affect readability of the data on CD-R's? Or does it affect audio only? -- LKRaider 18:31, 3 September 2007 (UTC)
I think this is a popular half-truth being propagated due to the fact that a lot of CD-R users are casual pirates and as a result they tend to be cheap and buy low-quality hardware and/or low-quality media to make copies. When you have a cheap burner, it's not surprising that it may make marginal copies that, even fresh, are on the verge of degradation and the media isn't given a reasonable chance to maintain it. Cheap media on the other hand is probably halfway rotted before you even make the burn, so it's only a short matter of time before it degrades completely. And if you're using cheap stuff on both fronts, then I wouldn't expect copies to work well or last long at all. This is not to say, however, that such superstition needs to be taken into account for every burner and every brand of media. If you have a good quality burner and use decent media (the 40 cents per disc range is fine, no need for fancy stuff unless you are using it for commercial production) you will rarely see this kind of problem. On the other hand, if you have a no-name burner and/or use the super cheap unbranded 20-cent discs I would most certainly take some precautions to ensure a working copy with a reasonable shelf life. I have yet to read an actual report that statistically studies the longevity of CD-Rs produced under different burn conditions and using different hardware/media, but I suspect that it is the quality of the hardware/media that is at issue, rather than the speed of the technology. Basically, whenever there is a large differential in price for items that claim the same performance, people need to stop assuming that everything is going to work the same way. Nobody makes this assumption for a car, why do they do it for computer parts...? Ham Pastrami 08:07, 1 November 2007 (UTC)
The numbers in the column "Write time for 80 minute/700 MB CD-R" appear to be simply 80 minutes divided by the speed. Is there evidence to support these numbers? It is my understanding that above about 16x the discs are spun at constant angular velocity, and that the read/write speeds then refer to the speed at the outer radii. In other words, 52x is achieved only at the outer edge of the disc; the inner radii will be written at the same RPM, which works out to about 20x. So you're not going to be able to write a whole disc in 80/52 minutes. Does anyone know for sure? Spiel496 ( talk) 18:10, 14 January 2008 (UTC)
Guys I saw a French news in Sydney, FRANCE 20HR of 03/03/2008 saying that CD only last as much as 10 years! The research was conducted and they concluded from the word of the researcher of Jacques Perdereau that it can only last as much as 5 (30% to 50% damage)!!!
Results seen: FRANCE 20HR of 03/03/2008
I cannot fully understand the research organization... But it is true!
I mean, it is quite shocking... Can we actually upload videos!?
Anyone target other proof will be helpful. If you would like to watch the original broadcast of the news in French, you are more then welcome to visit http://www.ina.fr/video/3571726001/20-heures-emission-du-3-mars-2008.fr.html But of course, it is in French. You may also find the dialogue in text format below the page as of 26 Jul 2010. ( D. Lau ( talk) 13:33, 26 July 2010 (UTC))
My first CD-R drive in the mid-1990s used a CD caddy. Any idea what the purpose of this was? The article needs a mention of this if it was a mass market idea. - Rolypolyman ( talk) 18:05, 7 September 2008 (UTC)
In the early 1980s, the idea behind CD caddies was to protect the disc and look similar to the then-new 3.5 inch floppy disc. However, the caddy drove cost up per disc, so the industry mostly ditched it. It's too bad, as these caddies would've save a good many people from re-buying CDs and now DVDs, and things like CD cleaning units and disc doctors wouldn't exist today. For me, paying a little extra more to preserve my information makes more sense, but this isn't the place to discuss that. Coffee5binky ( talk) 16:44, 10 December 2009 (UTC)
If anybody reverts my edit about the dark/light areas of a disc, they are wrong to do so. Every CD-R I have burned always have darkened data areas. —Preceding unsigned comment added by Shane91c ( talk • contribs) 22:03, 23 January 2009 (UTC)
Hi People! I am having a lot of used CD-R/DVD-R. any ideal what should do to recycle the plastic to save the world? Thanks and Regards. —Preceding unsigned comment added by Angelicalchin ( talk • contribs) 18:16, 18 February 2010 (UTC)
An additional form of security disposal is to skim the label side of the CD in a lathe. Grip lightly in the 3-jaw chuck and run at high speed. A sharp knife tool will skim the surface and reflecting layer off. The only downside is that the swarf is incredibly light and gets everywhere. I'm afraid this falls foul of WP:NOR unless someone can find a citation somewhere. Martin of Sheffield ( talk) 18:02, 24 November 2011 (UTC)
Since CD-RW technology is mentioned in the section, it might be interesting to also describe the lifespan of RW-s, and that might be an interesting topic. If the RW alloy is less prone to oxidation then the regular reflective layer, and if it is less prone to degradation then dye (which as a metal it should be, there might be some danger of spontaneous recrystallization though), then as strange as it might sound, they might be a better solution for long time data storage, just as some other erasable optical drive types have been... Arny ( talk) 09:50, 29 November 2011 (UTC)
The article says 1988, but Rainbow_Books#Orange_Book_(1990) says 1990 for the orange book. I suppose it depends on the exact meaning of release. Kodak PhotoCD came out, as well as I know, in 1990. Presumably much development was done before the official release. Gah4 ( talk) 10:07, 7 February 2020 (UTC)
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Needs to be merged:
A CD recorder is a computer peripheral that writes data to a CD disk. There are two main types -- CD-R and CD-RW. CD-R is CD-Recordable. CD-RW is CD-Rewritable.
CD recorders are also known as CD burners. To record a CD is often called burning a CD.
-How come the normal CDs with things already written on them are all smooth on the "burned surface", when CD-Rs have a sharp mark of where the writing has ended?( Henningklevjer 17:38, 20 April 2006 (UTC))
-I thought the 650MB CD-R stored 650MiB, not 650000000B: 333000sectors * 2048bytes/sector / 1024 / 1024 = 650.390625. see http://www.cdrfaq.org/faq07.html#S7-6.
-Yeah, me too. CD-Rs seem to be measured in MiB (though they say MB as just about nobody uses the term MiB, while DVD-Rs seem to be measured in GB (not GiB).
- Yep. The reason why it says MB on Dan100's CDs is because the MiB terminology has not been adopted anywhere in the industry, thus the "(though MB is printed on CDs as the binary prefixes haven't caught on in the industry)" I added to the article. (odd that you would change it back to MB but not change that).
So, I suppose it would be possible to refer to it as a 650MB CD (though confusing, and we want to eliminate as much of that as possible in an encyclopedia, right?), but the way it was before I edited it "650MB (not MiB)" was flat out wrong. Psxer 08:08, 7 Jan 2005 (UTC)
Wuh? CDs, like any other storage media, are measured in megabytes. As said, these 'MiBs' have "not caught on in the industry", and they certainly haven't outside it, either. Dan100 19:02, Jan 7, 2005 (UTC)
I mean, I kinda see where you're coming from, but the bottom line is that MB is the accepted and universally-used terminology, for all its faults. Dan100 19:22, Jan 7, 2005 (UTC)
Oh and it's madness to use "650.390625", as that rounds to 650. You would no more say "650.390625" rather than "650" than, when asked by a collegue how far you travel in to work each day, you would say "19.74673 km" instead of "20 km". Dan100 19:26, Jan 7, 2005 (UTC)
it isn't burning pits into the dye; it's changing the color of the dye to make it less reflective, right? - Omegatron 05:30, Jan 15, 2005 (UTC)
The dye isn't reflective... the reflective layer (usually silver or a silver alloy) is. You don't burn pits in a CD-R, you burn dark spots in the dye layer. These dark spots absorb the light from the laser in the CD player's pickup more than the unexposed areas of dye, and so the reflected light and the resulting signal goes down whenever the read laser encounters a burned mark. The effect on the returning laser signal is similar to what happens on a replicated CD... similar, but different.
A replicated CD has a track of pits that are molded into the disc. These pits are molded in clear plastic, and they are coated with a reflective layer of aluminum. Although aluminum has lower reflectivity than silver, there is no dye layer on a replicated CD, so very little laser light is absorbed. When the focused laser spot of the CD player's pickup encounters a pit the light is diffracted, and the reflected light is greatly reduced (and the resulting signal voltage goes down).
So, while CD-Rs have burned marks that absorb the light and CDs have pits that diffract the light, the effect is that recorded CD-Rs emulate replicated CDs, which is what they were designed to do.
Actually, a replicated CD has pits molded into it, but it is read from the underside through the 1.2 mm thick polycarbonate disc, so the laser is actually focused on a track of bumps. But the diffraction is the same. Now, some people will tell you that the optical effect is the phase cancellation of the light being reflected from the bottom of the pit (top of the bump), versus the light that is reflected from the land areas around the pit (since the read laser spot is twice as wide as the pits are), but at these geometries the physics can be understood as pure diffraction. Keep in mind that the pit geometries are a fraction of the laser wavelength. Tvaughan1 21:27, 18 August 2006 (UTC)
Compatibility of CD-R and conventional read-only discs, CD and CD-ROM, is a miraculous achievement which was made possible by the dye materials developed by Taiyo Yuden.
I like Taiyo Yuden, too, but I don't think we should ascribe divine powers to them. Perhaps it was merely a wondrous achievement? Stunning, maybe? Gob-stopping? -- 68.41.122.213 11:02, 13 December 2005 (UTC)
http://tech.msn.com/howto/article.aspx?cp-documentid=23697
From the above article: The problem is material degradation. Optical discs commonly used for burning, such as CD-R and CD-RW, have a recording surface consisting of a layer of dye that can be modified by heat to store data. The degradation process can result in the data "shifting" on the surface and thus becoming unreadable to the laser beam. "Many of the cheap burnable CDs available at discount stores have a life span of around two years," Gerecke says. "Some of the better-quality discs offer a longer life span, of a maximum of five years." Distinguishing high-quality burnable CDs from low-quality discs is difficult, he says, because few vendors use life span as a selling point.
From the Wiki page: Burned CD-Rs suffer from material degradation, just like most writeable media. Optical discs commonly used for burning, such CD-R and CD-RW have a recording surface consisting of a layer of dye that can be modified by heat to store data. The degradation process can result in the data "shifting" on the surface and thus becoming unreadable to the laser beam. Many of the cheap burnable CDs available at discount stores have a life span of around two years. Some of the higher quality discs offer a longer life span, of a maximum of five years. Distinguishing high-quality burnable CDs from low-quality discs is difficult, because few vendors use life span as a selling point. 65.118.253.68 18:09, 18 January 2006 (UTC)
calling something a miraculous achievement is certainly POV - a miracle is about as pov as you can get. 65.35.93.97 15:09, 20 February 2006 (UTC)
Does anybody know anything about CD+R? There's no article about it. Rt66lt 01:35, 4 March 2006 (UTC)
There is no such thing as CD+R... only CD-R. There is a "CD Plus", which is a multi-session CD with CD-Audio tracks in the first session and a CD-ROM track in the second session. Tvaughan1 21:13, 18 August 2006 (UTC)
I've used simple liquid disk washing detergent for 10 yrs. Cleans off sticky stuff, oils, and dirt. I always pat dry with a clean soft cloth.
. . . regarding "use a circular motion to remove all the toothpaste"; why circular when the previous instructions were to move in a radial direction ? - Sue 08:40, 14 August 2006 (UTC)
Just a question..... how do you put files onto a cd-r? I tried and all it said was, it is not compatible, it is not formatted..... How.....
"They use Eight-to-Fourteen Modulation, CIRC error correction plus the third error correction layer defined for CD-ROM. The first CD-Rs were produced in 1988"
CIRC linked to a disambiguation-page, so I changed the target page to the appropriate one, namely http://en.wikipedia.org/wiki/Cross-Interleaved_Reed-Solomon_Coding. 62.238.92.181 14:51, 18 April 2006 (UTC)
Deep scratches on the data side can interfere with the focus of the laser and render a disc unreadable.
is the above method of cleaning likely to damage a CD? it certainly seems effective at getting the grime off them. Plugwash 11:59, 22 May 2006 (UTC)
No, it is not likely to damage a CD as long as your t-shirt is clean (no dirt particles that could scratch the disc). Tvaughan1 21:15, 18 August 2006 (UTC)
My understanding was that most 80 minute CD-Rs in fact fully complied with the standard. The standard specified large tolerances due to the manufacturing tech at the time but as this improved, it became possible to make 80 minutes CD-Rs which fully complied with the standard but were obviously at the upper end of the tolerances. Perhaps what I've heard is wrong and tolerances and manufacturing tech doesn't actually allow 80 minutes CD-Rs to be produced which fully comply or they're mostly not fully compliant but if there is some truth to this story, e.g. tolerances and tech allow up to 78 minute fully complaint CDRs, we should make it clear this idea clear, that the tolerances were rather loose and better manufacturing tech allowed CD-Rs to be produced which only marginally broke the tolerances... Nil Einne 11:59, 26 May 2006 (UTC)
The part of this article containing facts about how to keep them clean doesn't sound right. Try to remove the second person (you).
The lede ends with this: "The CD-R retains all the abilities of the CD standard but adds the functionality of being able to store either music or data." I have plenty of regular CDs that contain music and data. Isn't the real distinguishing characteristic of CD-Rs that music and data can be recorded onto them? -- Rob Kennedy 07:27, 7 July 2006 (UTC)
You are both correct, depending on how you read the above statement. CD-R is a physical format. For the most part, the physical format is independent of the application format (CD-Audio, CD-ROM, CD-Interactive, etc.). I think the original author of the above sentence meant for the focus to be on the words "adds the ability to store", rather than on the words "either music or data". Perhaps if we substituted the word "record" for "store" and the word "content" for "either music or data", the phrase would be more accurate. Or perhaps we could simply say something like "The CD-R is designed to behave identically to a standard CD-Audio or CD-ROM which is mass replicated. However, the CD-R can be recorded by anyone with a CD-R recorder and a blank CD-R disc." Tvaughan1 22:28, 17 August 2006 (UTC)
Could someone add a section describing 'audio CD-R'? In the UK at least, most consumer audio cd writers are restricted to this type of disc so that a levy can be paid to the music publishers. Many users are confused about this.-- 137.205.146.206 09:20, 3 August 2006 (UTC) roger thorpe
It is true. Those audio CDs were charged at a premium and were only valid in CD recorders. — Preceding unsigned comment added by 77.101.103.91 ( talk) 17:36, 18 August 2016 (UTC)
According to a Maxell press release from 2002, burning CDs at or faster than 52X carries with it some risk.
“ | Maxell engineers determined that the minimal speed advantage offered by 52X drives is outweighed by the performance and safety issues of operating CD-R media in excess of 10,000 rpm. Research has shown that naturally occurring minute defects or cracks in the CD-R hub area can quickly expand when exposed to the physical stresses of 52X operations. These small, virtually undetectable defects can easily cause discs to break apart at 52X speed, destroying not only critical data stored on the CD-R media, but potentially damaging or destroying the CD drive. | ” |
If this is correct, maybe it should be incorporated into this article, somehow? Looking at Maxell's webpage, I see that the fastest CD-Rs they produce are still 48X ones... TerraFrost 17:04, 27 November 2006 (UTC)
There is nothing in article about any countries taxing CD-R as a way to combat music piracy. Germany, France, Italy, The Netherlands and Spain all have CD-R taxes and Canada is considering it. Jon513 14:10, 30 November 2006 (UTC)
"most markers can bleed-through the CD/DVD and destroy your data"
The article on disk care linked in this section contains related product advertisement ("Maxell Disc Writer Pen"). I am not sure if it would be considered indirect advertising. 124.168.184.54 10:25, 28 January 2007 (UTC)
I rewrote the paragraph on the writing process. Got rid of the repetition of the the term "burn"; removed phrase calling the dye layer "magnetic". I intentionally left it vague as to whether heating the dye causes a lowering or a raising of the reflectivity. Does anyone know for certain which it is? Spiel496 04:22, 17 February 2007 (UTC)
Why is that you can only put 80 minutes worth of music on a CD when the full capacity is 700mb? Seems like a waste. —The preceding unsigned comment was added by 70.48.32.149 ( talk) 01:12, 8 April 2007 (UTC).
In all the incredible techy detail here, everyone's rather overlooked the retail history of the CD-R format. All I can tell from this article is that the spec was published in 1988. Please someone expand the History section before adding even more geeky stuff. (And I say that as someone really interested in the geeky stuff!) 86.143.52.241 02:27, 3 June 2007 (UTC)
I'd like to add this information to the article, but I'm not sure how to do it. I will leave it up to someone more experienced than I. The following comes from Janis Ian, a former singer from the era of the 60s and 70s:
"Several years ago the music industry reached an agreement with CD manufacturers to receive a royalty on blank, recordable CDs to compensate for the effects of copying music. The recording industry is receiving a royalty for the "Audio" CD so that it can be used for copying music, taking that money, and then turning around and complaining that the CD is being used to make "unauthorized" copies. Now what is up with that? - http://www.janisian.com/article-internet_debacle.html and http://www.janisian.com/articles-perfsong/Fallout%20-%20rev%2011-23-05.pdf - Theaveng 17:44, 31 August 2007 (UTC)
"Burn speed can also affect the compatibility due to poorer pit definition on disks burnt at high speed, selecting the slowest supported speed for the burner/media combination is strongly recommended when burning audio CDs, to maximize compatibility."
Is this accurate? Does burn speed really affect readability of the data on CD-R's? Or does it affect audio only? -- LKRaider 18:31, 3 September 2007 (UTC)
I think this is a popular half-truth being propagated due to the fact that a lot of CD-R users are casual pirates and as a result they tend to be cheap and buy low-quality hardware and/or low-quality media to make copies. When you have a cheap burner, it's not surprising that it may make marginal copies that, even fresh, are on the verge of degradation and the media isn't given a reasonable chance to maintain it. Cheap media on the other hand is probably halfway rotted before you even make the burn, so it's only a short matter of time before it degrades completely. And if you're using cheap stuff on both fronts, then I wouldn't expect copies to work well or last long at all. This is not to say, however, that such superstition needs to be taken into account for every burner and every brand of media. If you have a good quality burner and use decent media (the 40 cents per disc range is fine, no need for fancy stuff unless you are using it for commercial production) you will rarely see this kind of problem. On the other hand, if you have a no-name burner and/or use the super cheap unbranded 20-cent discs I would most certainly take some precautions to ensure a working copy with a reasonable shelf life. I have yet to read an actual report that statistically studies the longevity of CD-Rs produced under different burn conditions and using different hardware/media, but I suspect that it is the quality of the hardware/media that is at issue, rather than the speed of the technology. Basically, whenever there is a large differential in price for items that claim the same performance, people need to stop assuming that everything is going to work the same way. Nobody makes this assumption for a car, why do they do it for computer parts...? Ham Pastrami 08:07, 1 November 2007 (UTC)
The numbers in the column "Write time for 80 minute/700 MB CD-R" appear to be simply 80 minutes divided by the speed. Is there evidence to support these numbers? It is my understanding that above about 16x the discs are spun at constant angular velocity, and that the read/write speeds then refer to the speed at the outer radii. In other words, 52x is achieved only at the outer edge of the disc; the inner radii will be written at the same RPM, which works out to about 20x. So you're not going to be able to write a whole disc in 80/52 minutes. Does anyone know for sure? Spiel496 ( talk) 18:10, 14 January 2008 (UTC)
Guys I saw a French news in Sydney, FRANCE 20HR of 03/03/2008 saying that CD only last as much as 10 years! The research was conducted and they concluded from the word of the researcher of Jacques Perdereau that it can only last as much as 5 (30% to 50% damage)!!!
Results seen: FRANCE 20HR of 03/03/2008
I cannot fully understand the research organization... But it is true!
I mean, it is quite shocking... Can we actually upload videos!?
Anyone target other proof will be helpful. If you would like to watch the original broadcast of the news in French, you are more then welcome to visit http://www.ina.fr/video/3571726001/20-heures-emission-du-3-mars-2008.fr.html But of course, it is in French. You may also find the dialogue in text format below the page as of 26 Jul 2010. ( D. Lau ( talk) 13:33, 26 July 2010 (UTC))
My first CD-R drive in the mid-1990s used a CD caddy. Any idea what the purpose of this was? The article needs a mention of this if it was a mass market idea. - Rolypolyman ( talk) 18:05, 7 September 2008 (UTC)
In the early 1980s, the idea behind CD caddies was to protect the disc and look similar to the then-new 3.5 inch floppy disc. However, the caddy drove cost up per disc, so the industry mostly ditched it. It's too bad, as these caddies would've save a good many people from re-buying CDs and now DVDs, and things like CD cleaning units and disc doctors wouldn't exist today. For me, paying a little extra more to preserve my information makes more sense, but this isn't the place to discuss that. Coffee5binky ( talk) 16:44, 10 December 2009 (UTC)
If anybody reverts my edit about the dark/light areas of a disc, they are wrong to do so. Every CD-R I have burned always have darkened data areas. —Preceding unsigned comment added by Shane91c ( talk • contribs) 22:03, 23 January 2009 (UTC)
Hi People! I am having a lot of used CD-R/DVD-R. any ideal what should do to recycle the plastic to save the world? Thanks and Regards. —Preceding unsigned comment added by Angelicalchin ( talk • contribs) 18:16, 18 February 2010 (UTC)
An additional form of security disposal is to skim the label side of the CD in a lathe. Grip lightly in the 3-jaw chuck and run at high speed. A sharp knife tool will skim the surface and reflecting layer off. The only downside is that the swarf is incredibly light and gets everywhere. I'm afraid this falls foul of WP:NOR unless someone can find a citation somewhere. Martin of Sheffield ( talk) 18:02, 24 November 2011 (UTC)
Since CD-RW technology is mentioned in the section, it might be interesting to also describe the lifespan of RW-s, and that might be an interesting topic. If the RW alloy is less prone to oxidation then the regular reflective layer, and if it is less prone to degradation then dye (which as a metal it should be, there might be some danger of spontaneous recrystallization though), then as strange as it might sound, they might be a better solution for long time data storage, just as some other erasable optical drive types have been... Arny ( talk) 09:50, 29 November 2011 (UTC)
The article says 1988, but Rainbow_Books#Orange_Book_(1990) says 1990 for the orange book. I suppose it depends on the exact meaning of release. Kodak PhotoCD came out, as well as I know, in 1990. Presumably much development was done before the official release. Gah4 ( talk) 10:07, 7 February 2020 (UTC)