This is the word from the DVD FAQ, located at
http://www.videodiscovery.com/vdyweb/dvd/dvdfaq.html
<quote>
[2.4.3] Is CD-R compatible with DVD-ROM?
Sometimes. The problem is that CD-Rs (Orange Book Part II) are "invisible"
to DVD laser wavelength because the dye used in CD-Rs doesn't reflect the
beam. Some first-generation DVD-ROM drives and many DVD players can't read
CD-Rs. The common solution is to use two lasers at different wavelengths:
one for reading DVDs and the other for reading CDs and CD-Rs. Variatons
on the theme include Sony's "dual discrete optical pickup" with
switchable pickup assemblies with separate optics, Sony's dual-wavelength
laser (to be initially deployed on Playstation 2), Samsung's "annular
masked objective lens" with a shared optical path, Toshiba's similar
shared optical path using an objective lens masked with a coating that's
transparent only to 650-nm light, Hitachi's switchable objective lens
assembly, and Matsushita's holographic dual-focus lens. Look for drives
with the MultiRead label, which guarantees compatibility with CD-R and
CD-RW media.
An effort to develop CD-R "Type II" media compatible with both CD and
DVD wavelengths has been abandoned.
DVD-ROM drives can't record on any media. Current writable DVD drives
(see 4.3) can't record on CD-R, although future versions may be able to.
</quote>
brucelev wrote:
quoted 7 lines just realized my new panasonic dvd player won't play any of my CD-Rs. of
> just realized my new panasonic dvd player won't play any of my CD-Rs. of
> course, this is mentioned in the manual with the list of other more obvious
> formats it doesn't like, such as PAL discs, Divx, and cd-roms. is this all
> dvd players, or just panasonic's?
> anyone understand the technical reasons, behind this? if my old cd player
> recognized the cd-rs as music discs, why does the dvd player think any
> different? after all, it does play music discs.
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