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Thread: How files having greater than 700 MB are burned into a CD

  1. #1
    Junior Member
    Join Date
    Dec 2003

    How files having greater than 700 MB are burned into a CD

    The conventional CD-R has got only a maximum capacity of 700 MB / 80 min. So we could write only data cd's having size < 700 MB. But we could burn audio or video upto 80 min. Usually a 80 min audio file has a size > 750 MB. How is this possible to write such a large file. What mechanism is used or what is difference in writing a data cd and an audio cd. please give ur suggestions.

  2. #2
    Join Date
    Aug 2001
    It just depends on the media.

    If you're talking about audio CD-R, the size is all that matters, not the length. You could have 200 minutes on a 700MB CD-R, as long as the size doesn't exceed 700MB.

    If you have a 700MB CD-R, you'll be able to put 80 minutes of music on it as long as the combined file size of your songs doesn't exceed 700MB...

  3. #3
    Old Fart
    Join Date
    Jun 2002
    This will probably only benefit residents of US/Canada, but you can buy 100 870 MB CD-Rs (that's 99 minutes) for $40.00 (plus shipping) by clicking here.
    It isn't paranoia when you KNOW they're out to get you...

  4. #4
    Senior Member nihil's Avatar
    Join Date
    Jul 2003
    United Kingdom: Bridlington
    In my opinion, it depends on the compression codec that you are using.........remember that you can now get DVD writers quite cheap, and they will hold around 4.7Gb


  5. #5
    Senior Member
    Join Date
    Nov 2003
    It's because audio on cd's is defined differently than it is on computers. On a computer, you have some kind of file setup like an mp3 that the music is stored in. On a CD, you have raw audio. If you get down to the nitty-gritty of a CD player, it works much like a microphone (well, in a sense). The laser eye (which is actual a laser and photosenitive plate coupled together behind a lens) reads the CD by firing a laser at the CD. If the point on the CD it shoots at is reflective, the laser comes back down at the same angle at which it was fired at the CD. The lens then refracts this back to the photosensitive plate. If the place it's shooting at isn't reflective then the laser obviously won't be reflected onto the plate. The plate basically works with a transistor to make disturbances in the flow of electricity that goes to the headphones (well, the amp circuit). So, the audio recording of a CD is really the raw sound in analog form, not a digitally quantified form which allows you to have that 80 minutes of song on a CD.
    Is there a sum of an inifinite geometric series? Well, that all depends on what you consider a negligible amount.

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