What exactly is CD DYE ? - Club CDFreaks

[M@steRW!z@rD] · 04-03-2004

my last discuss ...:

http://club.cdfreaks.com/showthread....5&pagenumber=2

xtacydima has mentioned CD DYE ... ?

what?s this about ... somekind of cd surface/structure ..?

would be nice to know s.th. more about it ..-smile-

cya ,

**xtacydima** · 04-03-2004

This Question really belongs in the Media Forum, but I will keep i here because for a while because I think it is good for any newcommer.

Look & browse here for elaborate explainations:
http://club.cdfreaks.com/showthread....id=61943#10)10

In short, DYE is a physical subsance - not like the kind used to color hair- used for the laser to burn pits into later to be interpreted as by the cd-rom reader (0 and 1's) and some DYE lasts longer than others, the same way some metals last longer than others before aging agents kick into effect and oxidize them. Same here with DYE, we now have tools to identify, such as Tayio Yuden, TDK, Rytek, CMC, etc... and various tetsing tools and test results all that can be found in the media forum, I suggest you browse more there.
http://club.cdfreaks.com/forumdisplay.php?s=&forumid=77

If you want this Question can be moved there where experts in the field can far more elaborate and twist your mind with technical explaiantions so that you become as confused a person as I am...hehehe

*BoSkin* · 04-03-2004

Quote:

Originally posted by BoSkin

I. Components of a CDR

Substrate

The polycarbonate disc is the basic component of a CD-R.
It has a very important role as the reader will notice when reading the section about the manufacturing process (molding).

Dye

The polycarbonate disc is covered by an organic dye where the information is stored.

The dye will decompose under the effects of the heat generated by a laser beam (wavelength of 780-790 nanometers).
The dye blackens under this effect and the information is created.

Gold or silver

A gold reflective layer is applied under a vacuum. The layer reflects the laser beam which reads the CD.
For economic reasons, silver has gradually replaced gold so as to reduce the cost of the end product as well as increase the reflectivity.
Nevertheless, CD-Rs with silver rather than gold layers have a shorter lifespan.

Lacquer

A layer of lacquer is applied to cover the gold completely. It goes beyond the edges and center of the disc in order to prevent any peeling (as the layer of gold tends to peel easily and humidity might therefore infiltrate).
This layer is baked under ultra-violet light for two seconds.

Protective layer

A resistant protective layer is applied to the lacquer which makes the medium impervious to scratches.

Printing

This is the final stage before the packaging.
It consists of printing graphic information onto the CD-R, such as manufacturer's name, type of product, etc...

---

II. Data layer

In CD-R, the organic dye sandwiched between the polycarbonate substrate and the metalized reflective layer of the media.
CD-Recordable discs do not have any data on them until they are recorded.
Instead the recording laser selectively melts "pits" into the dye layer -- but rather than burning holes in the dye, it simply melts it slightly, causing it to become non-translucent so the reading laser beam is refracted rather than reflected back to the reader's sensors.
In pressed CDs, the data layer is part of the polycarbonate substrate, and is pressed into the top side of it by a "stamper" during the injection moulding process.

---

Blue dye ( recording layer ) on gold ( reflective layer ) looks green, on silver - blue.

---

III. Dye characteristics/Longevity

In general, Cyanine dye is the de facto standard;

the Orange Book was written based on the original cyanine dye discs from Taiyo Yuden.
Most CD-Recorders are optimized for cyanine dye.
Cyanine discs are compatible with a wider range of laser powers.

Phthalocyanine dye has performed better than cyanine dye in accelerated age testing,
and may work better in higher speed recording (which requires higher laser powers.)

However, all of these differences aside, it appears that IN MOST CASES,
the two types of discs perform in essentially the same ways -
it's at the extremes and in the worst-case scenarios where these differences appear most marked.
There are many factors besides the dye composition that determine the quality of a CD-R disc.

---

Each media manufacturer strives to balance the engineering characteristics of the dye to insure greater compatibility with recorders and readers and long archive life.
Cyanine dye and its metal-stabilized derivatives were originally used because the Orange Book Part l referred to the recording characteristics of cyanine-based dyes in establishing CD-Recordable standards .

So, dyes based on cyanine tend to have a wide range of acceptable recording power levels and recording speeds .

The phthalocyanine dye is a newer dye that appears to be less sensitive to exposure to light after recording so that longevity has been improved.

Azo dye has been used in other optical recording media and is now being used in CD-R. The media manufacturers use these different dyes in combination with dye thickness, reflectivity thickness and material and groove structure to fine tune their recording characteristics for a wide range of recording speeds, recording power and media longevity.

Lifetime estimation of any storage medium is a very complex and statistical based process.
The CD-R media manufacturers have performed extensive media longevity studies within these industry defined tests and mathematical modeling techniques with results
claiming longevity from 70 years to over 200 years .
The primary caveat is how you handle and store the media. With proper handling and storage, your CD-Rs will outlive you.

arun_34 · 09-03-2004

@BoSkin , i would like to have a link for review of cdrw media . post

in that post , gerekmez has written that cdrw can be written for a while and after that , it cant be burned anymore . i would like if this information is correct .

*BoSkin* · 09-03-2004

Quote:

Originally posted by arun_34

i would like if this information is correct .

Answered

04-03-2004	#1 (permalink)
[M@steRW!z@rD] CD Freaks Junior Member Join Date: Nov 2002 Posts: 68	What exactly is CD DYE ? <a href='http://adstats.cdfreaks.com/www/delivery/ck.php?n=a13febf7&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='http://adstats.cdfreaks.com/www/delivery/avw.php?zoneid=30&cb=INSERT_RANDOM_NUMBER_HERE&n=a13febf7' border='0' alt='' /></a> my last discuss ...: http://club.cdfreaks.com/showthread....5&pagenumber=2 xtacydima has mentioned CD DYE ... ? what?s this about ... somekind of cd surface/structure ..? would be nice to know s.th. more about it ..-smile- cya , __________________ When It`s Done -...

04-03-2004	#2 (permalink)
xtacydima Moderator Join Date: Sep 2002 Location: Brooklyn, NY, USA Posts: 3,839	This Question really belongs in the Media Forum, but I will keep i here because for a while because I think it is good for any newcommer. Look & browse here for elaborate explainations: http://club.cdfreaks.com/showthread....id=61943#10)10 In short, DYE is a physical subsance - not like the kind used to color hair- used for the laser to burn pits into later to be interpreted as by the cd-rom reader (0 and 1's) and some DYE lasts longer than others, the same way some metals last longer than others before aging agents kick into effect and oxidize them. Same here with DYE, we now have tools to identify, such as Tayio Yuden, TDK, Rytek, CMC, etc... and various tetsing tools and test results all that can be found in the media forum, I suggest you browse more there. http://club.cdfreaks.com/forumdisplay.php?s=&forumid=77 If you want this Question can be moved there where experts in the field can far more elaborate and twist your mind with technical explaiantions so that you become as confused a person as I am...hehehe __________________ My Rig: Antec P160 P4 3.0E GHz running WinXP w/SP2 Scythe SCMN-1000 Heatsink w/Arctic Silver 5 Antec TruePower 2.0 TP2-550 (550W power supply) ASUS P4C800 Deluxe Motherboard 2GB RAM - Corsair XMS TWINX2048 (2x1GB) 3200C2Pro CL2.0 ATI RADEON X850XT AGP 2 - WD 37GB Raptor's (in RAID 0) via onboard Promise controller Western Digital 250GB SATA HDD on Primary SATA channel Western Digital 150GB SATA HDD on Secondary SATA channel Lite-On LTR-52246S 6S0F (IDE1 Master) Lite-On JLMS XJ-HD166S DS1C (IDE1 Slave) *NEC 3500AG 2.TC Quiet* (IDE2 Master) Lite-On SOHW 1673S JS07 (via USB 2.0 to IDE & set to Master)** Found a Solution here helpful? Like the forum's? Well then, what are you waiting for JOIN NOW!!!

09-03-2004	#4 (permalink)
arun_34 CD Freaks Senior Member Join Date: Apr 2003 Location: 3rd World Posts: 437	@BoSkin , i would like to have a link for review of cdrw media . post in that post , gerekmez has written that cdrw can be written for a while and after that , it cant be burned anymore . i would like if this information is correct . __________________ Knowledge is Power ( source : cdfreaks.com ) Official News : My new computer has the following configurations Intel Pentium-4 2.8GHZ 512MB DDR-333 RAM Intel Original 865GBF MOBO Geforce 4 MX-440 64mb AGP-8X 80GB 7200RPM HDD " Lead me not into temptation. I know my own way. "

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