800 MB on 700MB CD

Out of context: Reply #17

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  • acescence0

    allow me to shed some light on the subject.

    info on a cd is organised in sectors. audio cd's use 75 sectors per second of audio. 1 second of audio contains 176400 bytes. Since there are 75 sectors per second, 1 sector = 2352 bytes.

    now, audio cd's don't need error correction, they just interpolate from the adjacent samples so they can use every bit for audio. this method would obviously not work for data, so only 2048 bytes out of a total of 2352 bytes in each sector is available for user data on a data CD.

    because of this, an 80min. audio CD will rip to 807.5 Mb max, if you burn data onto a disc of similar size, you will only get 703.1 Mb on it.

    ta-da

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