XPost: alt.comp.os.windows-11
On 2025-08-18, Lawrence D’Oliveiro wrote:
On Sun, 17 Aug 2025 10:44:58 +0100, The Natural Philosopher wrote:
Mostly true. However it's the MEDIA that may be the problem.
Oversampling can reduce such errors.
Which is another load of nonsense.
CDs (and DVDs) often have read problems.
Which all CDs have
Audio CDs have a layer of error correction which reduces the effective
noise rate down beyond the range of human hearing.
However, if you tried encoding computer data with just that error
correction, it wouldn’t be enough. If it if were a “live CD”, for example,
then your computer would crash from all the errors before it could even finish booting up.
CD-ROMs add another layer of error correction, to bring the data fidelity
up to computer-data standards. This is why the audio CD sector size is
2352 bytes, while that for CD-ROM data is reduced to 2048 bytes.
But don't these 2352 bytes in CD-DA include duplicated data in both endiannesses? I'd have to check up what specifically, but I remember
that being mentioned in a Tanenbaum book. Or is it a negligible portion?
Or is the 2352 figure already reduced from a higher count to account for
that?
DVDs start with a computer-style filesystem, already at full computer-data fidelity standards, and store the audio and video as files within that.
--
Nuno Silva
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