• niobium over 12 years ago

    some of you probably know all about it but I am going to stick
    a little post I made elsewhere here as a 'Primer' of sorts.

    It is possibly a very good way to find out that a CD is not an original.
    Like if it has the wrong marking there.

    Anyway:

    Ok so I have learned a few things regarding matrix numbers.
    In fact I will make a new thread which i hope becomes a sticky
    for the following purposes:

    1) Verifying a CD's authenticity.
    2) Identifying the number of pressings or issues.
    3) Distinguishing differences among the above.

    Here is a blurb I found on the internet which pertains to CD's:

    Matrix Information: Matrix information is the letters and numbers printed
    on a compact disc in the mirror band close to the center of the CD. In
    most instances, part of the matrix information is printed to be read from
    the top side (label side) of the CD, while other parts of this information is
    printed to be read from the bottom side of the CD. (In some instances,
    matrix information can only be read from the bottom side of the CD after
    the label is put on, and top side information appears in reverse when
    read from the bottom side.)

    The following matrix information can be found on many compact discs:

    Catalog number - the identifying number given to the release by the
    record company.

    IFPI numbers - On many recent CDs, there are two IFPI numbers in the
    matrix. IFPI stands for International Federation of the Phonographic
    Industry.

    The first IFPI number identifies the Laser Beam Recorder that was used
    to cut the master.

    The second IFPI number identifies the specific mold that was used to
    produce the CD.

    Manufacturer's Work Order Number - This often is in the form of a bar
    code.

    Mastering Information - On most CDs there are three numbers separated
    by dashes, such as 2-2-1. These numbers refer to the father, the mother,
    and the stamper. In the example given, 2-2-1, the first 2 indicates that
    the CD was made from the second father, the second 2 indicates that the
    CD was made from the second mother made from the second father,
    and the third number, 1, means that the CD was made using the first
    stamper made from the second mother (The stamper is what is installed
    in the mold machine).

    some of my observations and readings

    Now, the father is the first (or first of many) negative(s) made
    to prepare a positive mother. The father is created from a glass
    master copy. The father being a negative can be used to make the
    CD but this is not normally done because it is important to not damage
    it, since it may be required to create additional mothers.
    The mothers cannot be used to make a CD since they are positives.
    The mothers are used to create a negative stamper which
    is the item used to stamp the CDs. It takes about five seconds to stamp
    a CD from a stamper.

    So, in conclusion, I would say that the best quality CDs will have the code
    1 - 1 - 1. My reasoning is that many mothers can be made from a father
    and there is therefore some potential for data corruption via the electroforming
    process used to deposit nickel onto the surface of the father to make the
    mother, and similarly from the mother to the stamper: 'generation loss'
    as it were.
  • niobium over 12 years ago

    About the disk forming process: I got that from the website of CINRAM.
    So, I don't really know for sure if CDs are all made like this.
    hehe, well...some of our issues may indeed involve CDs that are NOT
    made like this :)
  • niobium over 12 years ago

    .

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