Originally posted by SSJ4 Vegetto
Which dye is better?
Cyanine or Phalocyanine.
What is the difference between Long Strategy and Short Strategy?
The gold-colored CD-R uses the PhtaloCyanine pigment and a gold reflection layer. As the pigment is transparent, the golden reflection layer shines through the bottom side giving the `golden' look. Compared to the other colored media, the reflection contrast of the golden medium is the highest and the durability of such CD-Rs is said to be over 100 years. As the golden medium's reflective property is the highest, if your friends or customers have problems reading data from any other burnt media, try using the gold medium CD-R.
The green CD-R, the cheapest of the three, uses the Cyanine pigment. By itself, the pigment is blue in color, but together with the gold reflective layer, the bottom appears green. However, cyanine's ability to maintain reflectivity is poor giving it a life span of about 10 years. It also delivers the weakest reflection contrasts and thus can cause read errors when run on old CD-ROM drives.
Lately cyanine formula has been altered which results in a much higher life span (20 to 50 years). The gold reflection layer has also been replaced by a silver reflection layer this make the color of the bottom appear blue.
The blue media is made of Azo pigments. Like cyanine, it is blue in colour but unlike the green CD-R it uses a silver reflection layer which gives the blue colour. Manufacturers claim blue CD-Rs are as durable as golden ones.
Originally posted by BoSkin
Type code (T code)
T code indicates a recording characteristics of a disc.
With reading this code, CD-R writers can identify a recording characteristics of a disc.
The second digit of frame of the Lead-in Start Time in ATIP special information is assigned for each disc type.
A disc type is defined according to disc recording characteristics.
Discs are divided into the following two groups by their recording characteristics.
Second digit of frame Characteristics :
0~4 : Long Strategy Type ( e.g. Taiyo Yuden 97m 24s 01f / Mitsubishi Chemicals Corp. 97m 34s 21f)
(I3 deviation of RF of a disc which is written in Alternative media testing condition described in the chapter 2 of the Orange Book is small, when a length of the I3 write pulse is long. ex. Cyanine type media)
(0~4: free for each manufacturers)
5~9 : Short Strategy Type ( Mitsui Toatsu 97m 27s 56f)
(I3 deviation of RF of a disc which is written in Alternative media testing condition described in the chapter 2 of the Orange Book is small, when a length of the I3 write pulse is
short. ex. Phthalocyanine type media)
(5~9: free for each manufacturers)
More on that matter can be found here > The Disc Identification Code