I've read all the posts, now lets look at what DriveSpace/DoubleSpace actually
did...
You take a hard drive of x capacity, analyze the free space, a 'CVF'
(Compressed Volume File) with variable cluster size, move the files on the disk
into the newly created CVF file, compressing them in the process. once the
files have been moved into the CVF, it is mounted as a drive letter, and if
the file extension is .000, the drive letter is swapped with the host drive.
accessed through a block device that connects to a MRCI (Microsoft Realtime
Compression Interface) server.
When I read about CVF and MRCI in the DOS 6 Programmer's Reference (Microsoft),
I thought that there had to be a much simpler way to implement this. Especially
after the lawsuit between DOS 6.0 and DriveSpace's appearance in DOS 6.22. Of
course, other things pressing I never really sat down to come up with
something, by that time Windows 95 was on the horizon, and you could at least
get up to an 800MB hard drive, and Disk Manager could help you use it all.
To effect the same principle in FreeDOS, a real-time compression interface
would have to be clean room designed based on the known aspects of
DBLSPACE/DRVSPACE integration with MS-DOS (or Stacker's integration with
MS/PC-DOS), perhaps in the process figure out how we can improve the design,
there is no need to be compatible, offer existing DBLSPACE/DRVSPACE users a
reliable migrate path and go from there.
> Date: Fri, 21 Mar 2008 14:08:34 -0430
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: Re: [Freedos-devel] compressed FAT filesystems
>
> Would be OK something like a tar file, that includes time, date and
> attributes for each file.
> And may be compressed if needed.
>
> +-+-+-+-+-+-+-+
> Marco A. Achury
> Tel: +58-(212)-6158777
> Cel: +58-(414)-3142282
> Fax: +58-(212)-2410828
> Skype: marcoachury
> www.geocities.com/marcoachury
>
>
>
> Imre Leber escribió:
> > But then again,
> >
> > Do you realy need a file system if it is read only. You could just as well
> > use a table in the front that lists file names with path, and copy all data
> > after it. No need to have anything remotely like FAT and the like.
> >
> > Just:
> >
> > \temp\file1 start at 0
> > \temp\file2 start at 1000
> >
> > 0: data for \temp\file1
> > 1000: data for \temp\file2
> >
> > Not realy a file sytem, but should about the same.
> >
> > Imre
> >
> >
> >
>
>
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