The Disc Identification Code

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The Disc Identification Code is applicable to CD-R discs.

This Method defines as to obtain interchangeability between discs and writers for high speed recording.
The Disc Identification Code consists of the Manufacturer code and Type code.

Manufacture code (M code)

M code indicates a manufacturer of a disc.
With reading this code, CD-R writers can identify a manufacturer of a disc.

Configuration
Digits are assigned to each disc manufacturers, which are digits of minute,
digits of second and first digit of frame of the Lead-in Start Time in ATIP special information
(referred to section 4 in chapter 4 of the Orange Book).

Those digits are used for a writer to identify a disc manufacturer.
Two codes are prepared for a manufacturer.
A disc manufacturer can use whichever code for adapting any constant
linear velocity. Overlap of this code is prohibited.

Example of M code :

Manufacturer A
1st Code
97m14s30f ~ 97m14s39f
2nd Code
97m40s20f ~ 97m40s29f

Manufacturer B
1st Code
97m14s40f ~ 97m14s49f
2nd Code
97m41s20f ~ 97m41s29f

Manufacturer C
1st Code
97m15s10f ~ 97m15s19f
2nd Code
97m40s50f ~ 97m40s59f

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.

Configuration
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)

A number
(mm:ss:fx) of a tentative code is assigned according to a request from a disc manufacturer,
however, in case that the number conflicts with any existing M code,
a tentative code is not issued until that conflict is solved.
In a case that a manufacturer doesn’t ship a disc into a market with the assigned tentative code within 6 months
after its issue date, such assigned code becomes invalid and it is deleted from the tentative code list.

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