Xbox 360 digital title preservation

General No-Intro related discussions.
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pelago
Posts: 5
Joined: 07 Jan 2020 18:24

Xbox 360 digital title preservation

Post by pelago » 08 Jan 2020 19:37

Is Xbox 360 digital (e.g. XBLA, Games On Demand, DLC, updates) preservation within scope for no-intro?

Hiccup
Datter
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Joined: 09 Oct 2015 11:29

Re: Xbox 360 digital title preservation

Post by Hiccup » 10 Jan 2020 18:42

Yes and there's already a dat for it. But I don't think it has been updated for a while.

pelago
Posts: 5
Joined: 07 Jan 2020 18:24

Re: Xbox 360 digital title preservation

Post by pelago » 10 Jan 2020 22:02

Thanks, I found the DAT, that's great.

I don't see a dumping guide on the wiki, unless I've overlooked one. It'd be good if "we" could dump/verify ourselves, rather than rely on the scene releases.

I believe the console ID and user ID are embedded in the downloads, so everyone who downloads a title will get a slightly different file.

Hiccup
Datter
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Re: Xbox 360 digital title preservation

Post by Hiccup » 11 Jan 2020 13:50

Indeed it would be good to get some dumps made by trusted users. It would be good to test how the "same" file on different consoles differs. If there are just some ID fields that differ, they could be 00'd or FF'd out and the differing data can optionally be added to the comment of the dump. That's how its done in most other dats.

I don't really know much about the Xbox 360, but I think it may just be matter of copying the relevant file(s) from the filesystem using homebrew tools.

Resistiv
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Joined: 21 Jan 2020 22:26

Re: Xbox 360 digital title preservation

Post by Resistiv » 22 Jan 2020 02:07

Yes, it looks like you can indeed just copy over files from a hard drive using something like FATXplorer, however the files are often signed differently in their headers, which produces differing hashes. Here's looking at one dump, comparing my dump (left) and the scene dump in the dat (right) of N+ (World) (XBLA). Everything after the highlighted byte is matching in the attached image. Of course, more samples will be needed for decisive action, but it seems that the first 568 bytes (0x238) can be skipped when hashing.
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RetroGamer
Dumper
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Joined: 08 Oct 2014 22:53

Re: Xbox 360 digital title preservation

Post by RetroGamer » 27 Jan 2020 16:17

Back in 2012 and 2013 i dowloaded from Marketplace 100's of demos and dumped them to add the verifications to DoM. I Also discovered some new dumps...

It was many years ago but, if i recall well, the X-Box 360 scene releases (and the 360 no-intro dat) were a mess because some groups released betas (PNET) as final releases, the early scene releases were intact and in later releases they zeroed the "Console ID" bytes in the beggining of the file)... So that means that DB is inconsitent and it should have a standard (i talked about this with xuom2 back in the day...)

I never understood the "Console ID" concept but i think everyone who downloaded from Marketplace get the same file.

It's a shame that there weren't more dedicated dumpers of this digital games because it was very easy to dump and now, maybe, they are all gone...

pelago
Posts: 5
Joined: 07 Jan 2020 18:24

Re: Xbox 360 digital title preservation

Post by pelago » 01 Feb 2020 19:09

Well, the Indie games are no longer there, but the Arcade and Games on Demand stuff still is. Except for a few things that have been delisted. So it's not too late yet for the majority of stuff to be properly preserved.

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