What's the difference between a normal blank CD and CD's given magazines,etc....

Discussion in 'Networking' started by Ray, Dec 16, 2006.

Thread Status:
Not open for further replies.
  1. Ray

    Ray Precision Processor

    Joined:
    Dec 7, 2006
    Messages:
    71
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    The farthest star in the sky.
    I have seen that normal blank CD's,that we buy like frontech & moserbaer r greenish tinged but original CD's,CD's given by magazines, have a silvery surface.What's the difference between the two where can I buy blank CD's with silvery surface?
     
  2. krazyfrog

    krazyfrog Guest

    The green or golden colour of blank discs is mostly due to a layer of ScratchGuard applied to its surface to protect it from scratches. This layer is found only on blank media. The colour is there to differentiate it from non-ScratchGuard discs. Other discs don't have this layer. So they look silver.
     
    kl_ravi likes this.
  3. n2casey

    n2casey Super Hero - Super Powers

    Joined:
    Sep 1, 2006
    Messages:
    766
    Likes Received:
    20
    Trophy Points:
    0
    Location:
    Dynamic
    ^^
    If that's the truth then we have poor quality CDs from Digit. Right? :D :D
     
  4. gauravakaasid

    gauravakaasid Back to l33ching :)

    Joined:
    Jun 25, 2005
    Messages:
    831
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Latitude: 22° 32' North. Longitude: 88° 22' East
    AFAIK the cds given away by magazines are stamped, they are not written to. i guess that may be one of the reasons why they have a silvery surface.
     
  5. blackpearl

    blackpearl The Devil

    Joined:
    Feb 15, 2006
    Messages:
    1,082
    Likes Received:
    35
    Trophy Points:
    48
    Location:
    0x02AE88C6FF
    The greenish color is due to the organic dye used in blank CDs.

    Blank CDs are different from the ones given by Digit, the silvery ones. A "real" CD (the silvery CD) contains pits and bumps which corresponds to 1s and 0s. When a laser beam hits a bump it gets scattered and when it hits a pit, it gets reflected back to the lens.

    The blanks CDs on the other hand, does not contain pits and bump. Rather they posses a layer of organic dye on the surface which turns opaque when exposed to laser light of a certain wavelenght, just like the dye used in photographic films. The CD writer "burns" this organic dye, i.e. exposes them to a laser beam which turns specific areas opaque. When you read such a CD, the opaque areas does not reflect light and behaves like a "bump" while the unburnt areas reflect light which behaves like a "pit".

    The discs given by Digit are the "true" optical discs in the sense they contain real pits and bumps and are called pressed discs. The blank CDs just try to emaluate these optical discs. A special method is used to make pressed discs and such discs usually lasts longer because the pits and bumps are permanently etched into the surface. But written CDs dosen't last long because over time the organic dye detoriates, and the data becomes corrupt. Just like old photgraphs get discoloured and smeared, because home written discs are just a "photographic print" of a real optical disc.
     
  6. krazyfrog

    krazyfrog Guest

    ^^ Thanks for the great info mate. Reps added to your account.
     
  7. shantanu

    shantanu Active Member

    Joined:
    Dec 7, 2006
    Messages:
    2,784
    Likes Received:
    24
    Trophy Points:
    38
    LOVED YOUR ANSWER REPS TO YOU
     
  8. seriuslyblack

    seriuslyblack New Member

    Joined:
    Nov 27, 2006
    Messages:
    40
    Likes Received:
    0
    Trophy Points:
    0
    whew! never knew this info. thanks man!!:D
     
  9. JGuru

    JGuru Well-Known Member

    Joined:
    Dec 25, 2005
    Messages:
    1,705
    Likes Received:
    32
    Trophy Points:
    48
    Location:
    Space-time continuum
    What @Blackpearl said is 100% right.
     
  10. ax3

    ax3 Cool as a CUCUMBAR ! ! !

    Joined:
    Dec 14, 2003
    Messages:
    5,388
    Likes Received:
    5
    Trophy Points:
    38
    thanx 4 info .......
     
Thread Status:
Not open for further replies.

Share This Page