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 PostPost subject: Windows NT and DoubleSpace        Posted: Fri Oct 26, 2018 7:17 pm 
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Wed May 02, 2012 12:57 am


Favourite OS
Windows NT 3.x
Did you know that Windows NT was going to include DoubleSpace support at some point?

I didn't, but it turns out the NT4 source has everything in place to support DoubleSpace - down to the point where you could install Windows NT inside a DoubleSpace partition and it'd boot off that just fine with only NTLDR/NTDETECT/boot.ini having to be stored on the host drive. The code mentions MS-DOS 6.2 (released November 1993) so this functionality was likely slated for an NT 3.5 release.

The code is partly wrapped inside #ifs called "DBLSPACE_LEGAL" which suggests the legal battle with Stac going on at that time was the reason for its removal. Since Stac managed to get that preliminary injunction that prevented Microsoft from selling MS-DOS 6.2 with DoubleSpace, they couldn't relase NT with the same functionality either. And once the legal battle was over, they apparently never bothered re-implementing that functionality.

The obvious use for that would be dual-boot functionality with MS-DOS and later Windows 95 since Windows NT had their own NTFS compression. I don't think it was ever intended for more than that, though surprisingly Disk Administrator was to support compressing/uncompressing DoubleSpace volumes. It's an interesting tidbit, nonetheless.

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 PostPost subject: Re: Windows NT and DoubleSpace        Posted: Fri Nov 09, 2018 5:45 am 
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Mon Nov 13, 2017 6:47 am

I wonder if they decided to focus on drvspacx.vxd for Windows 95 instead. As a side note, it is unfortunate that there is no new version of MS-DOS with the unified drvspace.bin in Windows 95, though DriveSpace 3 would probably consume too much memory.

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 PostPost subject: Re: Windows NT and DoubleSpace        Posted: Thu Nov 15, 2018 2:15 pm 
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Wed Nov 14, 2018 8:57 pm


Puntarenas, Costa Rica

Favourite OS
Windows XP - 2600
I want to know something: Why are people still keeping copies of the leaked Windows NT/2000 source code and researching on it? I know that Microsoft had demanded this Web site not to provide more Microsoft source code and delete it immediately, but you people still look it up? Even after all these years I would've expected Microsoft to kill off every possible piece of the source code on the Internet and on many computers and servers.

And by the way, DoubleSpace/DriveSpace on Windows NT? There would have been many modifications to make to NT just to support DoubleSpace. By the way, can anyone actually provide us or make a modified copy of Windows NT 3.5(.1) with DoubleSpace support enabled?

Alejandro Herrera Barboza, 15, from Costa Rica
Rest in peace, NT 5.1 family. The world will remember your great efforts.
Microsoft Windows XP - Server 2003 - Embedded 2009 (August/October 2001-April 2019)

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