Lan Barnes wrote:
My noodling (can't call it research) shows that cddb music CDs do
have a TOC on the disk. The utility cdstatus will spill it.
The internet access theory is nice, but doesn't explain why
stand-alone devices (like a car CD player or a laptop off the net)
can see the titles.
I've also found that some CDs don't have this TOC, although they
often do have a header with the album name, artists, etc.
This is part of a not-completely-ubiquitous "standard" format (a Red
Book extension[1]) called CD-TEXT that allows textual data regarding
individual tracks or the disc as a whole to be store directly on the
media. However, it hasn't been utilized for all discs due in part to its
spotty implementation in hardware players; in addition, software players
can often access CDDB/FreeDB even if they support CD-TEXT, which makes
the on-disc textual data redundant.
[1] http://en.wikipedia.org/wiki/CD-Text
--
Brad Beyenhof
Systems Administrator
UC San Diego, Laboratory of Cognitive Imaging
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