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 PostPost subject: Windows NT and DoubleSpace        Posted: Fri Oct 26, 2018 7:17 pm 
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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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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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