Originally Posted by
Nigel Goodwin:
“As I said!.
Not 'converted' as it's not recorded as NTSC, or any other colour system.
Again, as I said.
No, the data on the disk isn't in any colour system, it's digital, there may be some data on the disk that tells the player what colour system to encode it in for composite output, but it's not recoded in any colour system the player adds the colour encoding, either NTSC or PAL (and presumably SECAM in France?).
All those I've tried over the years, including the ones customers bring in to complain! 
Of course it doesn't tell you in the manual, you find it out when you put a disk in and you're not using RGB, and your TV won't do NTSC - although most modernish sets do.
Region free disks (that play in NTSC) are fairly rare, the vast majority of disks in the UK are region 2, and the number of sets that won't cope is small as well.
I'm 'fortunate' in that I have a TV mounted on the wall for test purposes, with a three way SCART switch feeding it. The TV is an old Sony portable, it doesn't do NTSC, and it doesn't do RGB
so this allows me to test for people, and show them the problem and how to cure it!.
You even admitted above that Toshiba players do the same thing!.”
From your other posts it appears you are in retail and are informed about certain aspects of home cinema but its clear from other threads ,including this one that you are woefully uninformed on some things.
Firstly, we all know that disc info is not recorded in NTSC/PAL like it is on tape,but you should be aware that the info for how the data is output IS on the disc.
Every single disc in the world has the data included that tells the player what format the disc is in.
I said nothing of the kind about Toshiba.
I said Toshiba players dont give you the option to convert NTSC into PAL or vice versa.
Players with multiple options will convert to enable colour playback where there are compatibility problems.
Toshiba have no conversion anywhere.
Or at least the 2 I owned and the one a friend currently has.
It has 2 options: PAL and AUTO.
However if you play an NTSC disc when the player is set to PAL the player rejects it completely.
If you set it to AUTO then the NTSC will output as NTSC 3.58 (pure NTSC).
Other players with multiple options will output NTSC as either NTSC 3.58 (pure) or NTSC 4.43 (PAL 60) and some ,mostly low budget players will fully convert into PAL 50.
If the dvd player adds the colour encoding you may want to explain why US players from major brands do not play PAL discs at all ,even if they are R0.
They spin but there's no picture.
Well your experience of R0 discs in NTSC may be small but you obviously dont collect US dvd's.
Many labels of non mainsteam material issue discs as R0.
I have well over 150 of them from Anchor Bay,Blue Underground and others.
I also have a great many UK discs that are R0.
And as expected they are UK discs and play in PAL.
If your theory were correct you still have not explained how the player would cope with a multi coded disc.
When MVC were around I bought a fair few R0 NTSC discs from them.
But I will assume that you mean there are very few R0 NTSC discs in the UK.
Of course that is right.
But if you give me the titles I can possibly let you know whether your R0 discs are in NTSC.
Virtually all music titles are R0 and there are also some issued in the UK that are NTSC ,presumably down to laziness on the part of the distributor.(One season of Sex and The City was NTSC in the UK)
I've been collecting NTSC material since the days of the first Panasonic NTSC VCR (L50 IIRC) in 1990,and since then have been very involved in the world of NTSC via Laserdisc until early 1998 when I got a US R1 only dvd player (A Toshiba model)
I also have several thousand dvd's of all regions from all over the world so I do have some experience in the matter including about a dozen different players and recorders over the years .
All I am saying is that there is no way in the world that a dvd player of any brand would select NTSC or PAL based on the region code (or lack of it) ,which is what you are suggesting.
If you care to look through US dvd catalogues of non mainstream material ,you will find that in the world of music,really old movies and tv shows,documentaries and similar stuff that the discs that are R0 far outweigh those coded for R1.
Your other comment regarding conversion:
If a disc is coded to playback in NTSC and you want a PAL 60 or PAL 50 output from it perhaps you have another word to describe what happens