From Newsgroup: comp.sys.mac.vintage

In article <andreas-78B347.08364619082020@news.individual.de>, Andreas Rutishauser <andreas@macandreas.ch> wrote:

of course. If the drive is only capable of reading CVD-R,
it can't read +R or DualLayer,

i assume you mean dvd-r, and yes it can.

I meant DVD-R, sorry, and that is what I'm writing

what you're writing is wrong. very much wrong.

what do you mean by "yes it can"?

yes it can read +r and dual-layer.

you're wrong.

no i'm very definitely not wrong.

all dvd drives can read dual layer. it's part of the dvd spec.

please prove your claim.

what part of "it's part of the dvd spec" is not clear?

The DVD spec does not contain a single line how an optical drive has to
be built.

of course it does.

almost all movies are dual-layer discs. if it can play movies (which it can), then it reads dual layer.

^^proof^^

Has Ant tried this with his G4?

he said he was able to read dual layer discs, although i don't think he specifically tried a movie.

millions of others have watched dvd movies with various apple optical
drives without issues.

stop reading things you don't understand and try it yourself.

Sorry, I don't have a PowerBook G4 1 GHz at hand.

then don't try to claim it won't work.

there is no issue with reading dl discs, unless the dvd drive is
defective or non-compliant, or the disc has deteriorated or was
improperly burned, all failure modes, not the norm.

+r and -r refers to how the disc is *burned*, not how it's read. very old drives might have occasional problems because writable discs are less reflective than pressed discs, but that hasn't been an issue in a very, very long time.

^^additional^proof^^

again, stop reading things that you don't understand and try it
yourself.

I understand what I read.

apparently not.
--- Synchronet 3.18a-Linux NewsLink 1.113

From Newsgroup: comp.sys.mac.vintage

On 2020-08-19 06:36:46 +0000, Andreas Rutishauser said:

In article <180820201018180775%nospam@nospam.invalid>,
nospam <nospam@nospam.invalid> wrote:

In article <andreas-651113.08110118082020@news.individual.de>, Andreas
Rutishauser <andreas@macandreas.ch> wrote:

of course. If the drive is only capable of reading CVD-R, >>>>>>>>>>> it can't read +R or DualLayer,

i assume you mean dvd-r, and yes it can.

I meant DVD-R, sorry, and that is what I'm writing

what you're writing is wrong. very much wrong.

what do you mean by "yes it can"?

yes it can read +r and dual-layer.

you're wrong.

no i'm very definitely not wrong.

all dvd drives can read dual layer. it's part of the dvd spec.

please prove your claim.

what part of "it's part of the dvd spec" is not clear?

The DVD spec does not contain a single line how an optical drive has to
be built.

<snip>

Yep. We have an old el cheapo brand DVD player plugged into our TV. It
works fine with factory-made single layer DVD movie discs, but cannot
play factory-made dual-layer movie discs (which do work fine via an
external USB DVD drive plugged into my new-ish Mac).


--- Synchronet 3.18a-Linux NewsLink 1.113

From Newsgroup: comp.sys.mac.vintage

In article <rhka01$1jl2$1@gioia.aioe.org>, Your Name
<YourName@YourISP.com> wrote:

Yep. We have an old el cheapo brand DVD player plugged into our TV. It
works fine with factory-made single layer DVD movie discs, but cannot
play factory-made dual-layer movie discs (which do work fine via an
external USB DVD drive plugged into my new-ish Mac).

just about all movies are dual-layer discs, especially with all the
extras and other stuff on them, without any indication of the number of
layers.
--- Synchronet 3.18a-Linux NewsLink 1.113