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 PostPost subject: Audio in Chicago Discs        Posted: Mon May 06, 2019 6:22 am 
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Hi, I found that the copy of Chicago build 116 on the FTP was in BIN/CUE format and sunnyblueman2014 said that disc contains audio. I tried all CD ripping program trying to get those audio tracks but none of them worked. Eventually I managed to get 5 audio tracks extracted.

I then downloaded another build from original dump - build 189. I first thought it is just a plain data disc but after I converted the MDF/MDS it to an ISO file, I noticed 7-Zip says "There are some data after the end of the payload data". I extracted the extra 6805504 bytes and opened it using a hex editor (I thought they were over-dumped zeros). I found an unusually high number of FF, which suggested it might be some sort of audio. I searched for the presence of WAV format and I found quite a few. I copied the first WAV manually into a blank file and named it test.wav but it didn't work. I am 100% sure it is WAV so I added a header to that file and guess what, it works!

Now I am sure that there is audio/music on the disc and I used my programs to rip all audio off that disc.

I looks like the dumps from original Chicago discs contains audio tracks for whatever reason but it is quite rare for program/OS discs. If anybody know other Chicago discs with audio or why Microsoft put audio on the disc, please reply.

Download audio from Chicago build 116: https://mega.nz/#!kMNA0CwR!O-pJkwx8srJ1 ... iO8pVR2j0k

Download audio from Chicago build 189: https://mega.nz/#!FZFwwIKI!UsEasre9oASY ... j-rYGg5hE0

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 PostPost subject: Re: Audio in Chicago Discs        Posted: Mon May 06, 2019 6:57 pm 
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Redbook audio on these disks huh? Interesting. The ones from 189 sound like it was from some sort of edutainment game. I can't really think of how this would get on there aside from perhaps someone burning a Chicago disk over what was an edutainment game.

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 PostPost subject: Re: Audio in Chicago Discs        Posted: Wed May 08, 2019 3:01 pm 
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It doesn't work like that, you don't "overwrite" data on a CDR and still keep the original data, whole or partial, as usable content. That would be like overwriting a video file with a new smaller video file and it would still have parts of the previous video in it... doesn't work like that. If you append new tracks to a disc it retains the previous ones, but then it wouldn't have the layout with data first and audio second, and it surely wouldn't even allow to have audio first and data last. Also, RW discs came to market after Windows 95 was released. So these audio tracks were intentional and not accidental. Especially since more than one build has them. Most likely they added some random audio tracks to test the playback capabilities in Windows 95 during development. Or just for fun.

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 PostPost subject: Re: Audio in Chicago Discs        Posted: Sun May 12, 2019 2:23 pm 
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This reminds me of a rumor that there was some Windows XP disc that had a highly encrypted copy of MSBOB on it. But I'm not sure if it is true, and even if it is, the password would be so long that it would be nearly impossible to decrypt.

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 PostPost subject: Re: Audio in Chicago Discs        Posted: Sun May 12, 2019 5:45 pm 
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DiskingRound wrote:
This reminds me of a rumor that there was some Windows XP disc that had a highly encrypted copy of MSBOB on it. But I'm not sure if it is true, and even if it is, the password would be so long that it would be nearly impossible to decrypt.
Ah yeah, you're referring to this, right? Interesting stuff
https://docs.microsoft.com/en-us/previous-versions/technet-magazine/cc565089(v=msdn.10)

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