PS2 Laser - let me run this by you .....

[charlie_ps2]

When the DVD tray is closed the servo initiates. We all know that. It traverses the disk to get its diameter; identifies whether CD or DVD and if DVD whether DVD5 or DVD9.

CD / DVD differentiation is performed by interpreting the DSP's readout of the tracking error voltage.

DVD5 / DVD9 differentiation is performed by measuring the intensity of the reflected laser beam during the focus process. A voltage of 1v is interpreted as highly reflective and thus DVD; a voltage of around -.5v is taken to represent a DVD9.

Here is what I am opening to postulation:

What if the reflectivity voltage of a DVD-R lies in a band that that is definitely not associated with DVD5 or DVD9? Can Sony use this value to determine that media is definitely DVD-R and thus red-screen the disk before it gets near any mod-chip?

[dust4dust]

shut up

even if sony hasnt thought of it u giving them the idea

[Gazdaman]

I guess it's possible. let's hope sony finds it's impossible.

Gaz

[Bgnome]

going out on a limb here, but couldnt you make a mod supply the correct voltage somehow?

[precisionmods]

Maybe, but remember there is alot of reflectivity variation of the different types of original discs. Scratches, snot, dust and different crap on the surface all play a part on how well it can be read. So if they use the reflectivity values to try to stop DVDRs, then they can effectivley be stopping original media from being read!

It's much easier to to a boot sector check than it is to base a boot upon reflectivity.

Also, a chip then can hack the BIOS to feed false values and get the machine to boot the media, no matter what is in the tray.

[dust4dust]

most likely but all mods out so far wouldnt work

total redesign as mod have to turn straight on instantly take control,if not as u turn on with a dvdr in the ps2 it would red screen


if it does happen i think theres enough mods already out there to warant a 12c508 with seperate code maybe


but hardest part will be detecting were they have to wire it to

[meyousikmann]

Originally posted by Bgnome
going out on a limb here, but couldnt you make a mod supply the correct voltage somehow?

Nice thought....but I think if charlie is correct in his thinking, the ps2 will go red screen before the modchip even has a chance to inject the proper codes (or supply the proper voltage). Consider this, the modchip has to know what type of media is present in order to "supply" the correct voltage, just as the ps2 does itself. That would require the console to perform its media check to determine which media type is present....BAM!....too late to inject anything because the media recognition part done by the console has already figured out that the media is DVD-R based on a simple reflectivity analysis and red screened.

Question....are the specs for "pressed" DVD media, be it DVD5 or DVD9 so tight that a DVD-R would not fall into the range of either or both? Seems plausible, I suppose......

[charlie_ps2]

Originally posted by meyousikmann
Nice thought....but I think if charlie is correct in his thinking, the ps2 will go red screen before the modchip even has a chance to inject the proper codes (or supply the proper voltage). Consider this, the modchip has to know what type of media is present in order to "supply" the correct voltage, just as the ps2 does itself. That would require the console to perform its media check to determine which media type is present....BAM!....too late to inject anything because the media recognition part done by the console has already figured out that the media is DVD-R based on a simple reflectivity analysis and red screened.

Precisely. Sony have control at that point. If they want to go to red Screen before the modchip gets in, that is under their control too. We are right at the point where the processor has to make out what the disk is; Sony can do what they like with that info including bringing the PS2 to a stop.

This indicates that some serious re-thinking of modchip methods might be in order.

In reply to Precisionmods, my postulation is not nullified in a situation where a DVD9 Hong Kong Gold boots OK but all DVD-Rd don't.

[trumpetguyscw]

Puzzling question......
But is every DVD so exact to Sony specification that they could detect that? They would risk people with dirty or scratched original disks not being able to play them. Just wondering.

[charlie_ps2]

Originally posted by trumpetguyscw
Puzzling question......
But is every DVD so exact to Sony specification that they could detect that? They would risk people with dirty or scratched original disks not being able to play them. Just wondering.

Well yes. DVD spec (pressed) is rigid and QA would ensure consistent reflectivity - certainly within the bounds of a fiarly narrow voltage variance for DVD.

Dirty disks (not scratched - that's has different effects) would either come up 'No data' or Red Screen in the same way. So there is no connexion between the two situations.

Do you see that?