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[jameswalter]

If the media flag is the only thing that seems to be stopping us...is is possible that something could be developed to go inline with the DVD-Drive SATA connector and intercept the signal that gives the media code and modify it to look like a pressed disc?  This may not help with homebrew but it may help run backups.

[TracerX]

Don't think so. Removal of the media flag should throw off the checksum. Good thought though.
EDIT: Just realized you were talking about the media code of the disc. Definitely an interesting idea but how and when is the media code called up would be the question.

[lordvader129]

QUOTE(jameswalter @ Dec 14 2005, 01:58 PM)

If the media flag is the only thing that seems to be stopping us...is is possible that something could be developed to go inline with the DVD-Drive SATA connector and intercept the signal that gives the media code and modify it to look like a pressed disc?  This may not help with homebrew but it may help run backups.

yes, this could theoretically work (in fact i believe this is how modchips for the sega saturn work)

the trouble is, as tracer said, knowing how and when the media code is read, and also being able to insert this data into any encryptions or checksums that are running as well

i do however feel this is a potential avenue for modding if it turns out we cant load anything into system memory past the hypervisor

[Arakon]

opposite spin? uh?

[lordvader129]

QUOTE(globe_guyx @ Dec 19 2005, 03:50 PM)

As for xbox1, its disc type was read as "***XBOX**DVDROM***"only at game launch..  Nowhere else was it referenced in the kernel source..  I tried to get Alcohol to burn this as booktype and failed..  Perhaps the fact that xbox drives had opposite spin was an issue..  If thats the case, perhaps transposing the image byte by byte?

thats because xbox dvdrom isnt a bitsetting, its the media code, it cant be changed on recordable media (its set on the disc at the factory)

[jameswalter]

Right.  Its just not something that can be changed with how the media is burnt.  The change would need to be with the DVD-ROM firmware (always sends 360 disc media code no matter what) or with something inline with the SATA cable (intercepts the media code and changes it to the 360 disc one).

[jameswalter]

Upon further thinking about PS1/PS2 modchips and how they operate, it seems that they do something similar to what I first mentioned.  I believe they simply give the OS false data indicating that the security features on the disc are present and the OS then initiates the startup of the disc.  It is interesting to note how many wires are required and the complexity behind these modchips (PS2 at least).

[Tobb555]

with the ps1/2 you can just get those hot swap disk that allow you to play backups and other regin dvds. why sony allows the company to make them is beyond me but no modchip is needed unless you want to run unsigned code. But for backups all you need is a hot swap disk. Forget the offical name of them.

[crosseye]

semi true Tobb555. You can use a swapdisk, but you have to do some case modding so you don't have to eject to swap discs. You could also use the PS2 form of a softmod on a mem card. However, not all the games will load from the HDD.

[jameswalter]

Right...but I'm mostly referring to the physical modchip that has 20-30 wires.  At least it did when I modded mine, I know they have gotten more advanced.  The protection behind the PS2 discs is bad sectors that can't be reproduced with a burner (if memory serves me correctly).  The newer modchips also detect the type of disc (PS1, PS2, DVD) and auto boot with the correct sequence sent to the OS (or whatever is controlling it).  I'm thinking something like that would need to be done to play backups....unsigned code however is a completely different issue.

[evilkleen]

hmmmm.... highly interesting...  

[Lysip]

QUOTE

As for xbox1, its disc type was read as "***XBOX**DVDROM***"only at game launch.. Nowhere else was it referenced in the kernel source.. I tried to get Alcohol to burn this as booktype and failed.. Perhaps the fact that xbox drives had opposite spin was an issue.. If thats the case, perhaps transposing the image byte by byte?

Are you speaking of the media flag checks? i must assaume you have never see the kernel source ortherwise you might know what you are talking about.

[stevewal]

Yea I think you've got a good point there james.
There's so much emphisis put on running unsigned codes, that MS has consertrated a huge amount of effort to prevent this. I'm sure the way you have described is what we'll see the first mod chips do. Oh and by the way, I fited a ps2 mod chip a few months ago, and I think it only had about 7 wires.

[tiggersbowl1]

I am pretty sure that the least number of wires on  a ps2 chip is with the duo and ice code, that has 17, unless of course you are referring to one of the chips that will fit only on a version 4 or something.

[lordvader129]

QUOTE(stevewal @ Dec 28 2005, 08:42 AM)

Yea I think you've got a good point there james.
There's so much emphisis put on running unsigned codes, that MS has consertrated a huge amount of effort to prevent this. I'm sure the way you have described is what we'll see the first mod chips do. Oh and by the way, I fited a ps2 mod chip a few months ago, and I think it only had about 7 wires.

was it a no-swap chip? AFAIK there are 2 kinds of ps2 chips, one that prevents a reset when you eject the tray (you still have to use swap magic discs) and one that bypasses the media checks entirely (no-swap)