Sorry, I just assumed you didn't know anything about the low level disc formats. I think most people just think that the data in a raw disc image (for example) just get written straight to the disc as pits and troughs translated from the 0's and 1's.
I'm not too hot on the differences between CD and DVD formats at that level but I presume they are pretty much the same. In my message, I was referring to formats that are 'uncopyable' rather than 'unripable'. If you don't want the disc to be able to be read on a pc, then it could be done by having multiple sessions, where the first session is closed and the second session starts at a specific offset into the disc. I think the dreamcast did something along these lines in addition to the second session being higher density than a normal cd. Basically the same as the TOC thing, but without a firmware change the normal cd/dvd drive probably wouldn't be able to find the second session. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of smo Sent: 28 November 2005 17:45 To: free60-devel@lists.sourceforge.net Subject: Re: [Free60-Devel] Re: Game DVD formats Hi, I'm aware of basics of CD format (apparently DVD is a lot alike though?) and I didn't imply the format was a simple thing. At least part of the disc is standard DVD, since it can be read on a PC as DVD-video. The DVD drive in both Xboxes is supposed to be a pretty standard DVD-drive with some Xbox specific things (and by that I mean the difference is in the firmware, not in the optics, correct?). Looks like weak sectors are used by SafeDisc protection on PC and they seem to have no problem ripping those... On 28/11/05, Darren Coles <[EMAIL PROTECTED]> wrote: > At the lowest level, CD and DVD formats are a lot more complicated than you > might think. Its not just a case of writing the 0's and 1's from the data > you want to store onto disc. > > Theres several layers of error correction and the fact that the data has > To be encoded in such a way that it can be read back reliably. > > If you want to know more, try googling for EFM (eight fourteen modulation) > and 'Weak sectors' > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of smo > Sent: 28 November 2005 17:02 > To: free60-devel@lists.sourceforge.net > Subject: [Free60-Devel] Re: Game DVD formats > > Hello, > > My messages sounded a lot like it was about game piracy. My apologies, > it definately > wasn't about that - I'm more interested in how the security functions > from end-to-end. > > On 28/11/05, smo <[EMAIL PROTECTED]> wrote: > > Hi, > > > > What's so special about current game console DVD formats that render > > them uncopyable on a PC? They do contain somewhat standard DVD > > characteristics, > > don't they? > > > > I've tried researching this topic and all I came up was vague > > suggestions about the discs having a fake TOC and a proper TOC on a > > second layer. If I were to make a bit-for-bit copy of a game DVD (say > > if a PC DVD drive could do that), how would the console tell it apart > > from an original disc? > > > > -smo > > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://ads.osdn.com/?ad_idv37&alloc_id865&op=ick > _______________________________________________ > Free60-devel mailing list > Free60-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/free60-devel > > > > > ___________________________________________________________ > Yahoo! Model Search 2005 - Find the next catwalk superstars - http://uk.news.yahoo.com/hot/model-search/ > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. 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