Re: Copying NTFS Hard Links and Junctions to and from CD/DVD
From: Kevin Myers (KevinMyers_at_austin.rr.com)
Date: 03/06/04
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Date: Sat, 6 Mar 2004 02:37:01 -0600
Hi Leonard,
Thanks for your reply.
1. I know that many folks have asked for better Windows support of both hard
links and symbolic links so that similar capabilities to those used for many
worthwhile purposes in the *nix world would be available in Windows. Do you
know if additional hard link and/or symbolic link support is planned for any
Windows release in the forseeable future?
2. Given the fact that NTFS already supports hard links and junctions, don't
you think that is reasonable to expect the ability to create a file system
on CD/DVD that can support those same capabilities, so that application
files can be used transparently from CD/DVD just like they can from a hard
drive?
3. I am not an expert on CD file systems. But, while the Rock Ridge
extensions may have been originated for *nix support, I don't see any reason
that they couldn't be supported by Windows and Windows CD/DVD burning
applications. After all, *no* existing CD file system is truly an exact
replica of any native OS hard disk file system. Therefore, *any* current
CD/DVD file system requires a certain level of custom support in the OS.
So, why not just add Windows support for the ISO9660 Rock Ridge extensions
accordingly? It would just be another installable file system, or perhaps a
relatively minor modification or extension to one of the existing CD/DVD
file systems that you already support, right?
s/KAM
"Leonard Severt [MSFT]" <leons@online.microsoft.com> wrote in message
news:Xns949B10AF99BE8leonsonlinemicrosoft@24.25.9.42...
> "Kevin Myers" <KevinMyers@austin.rr.com> wrote in
> news:103n4r3tb73s1e4@corp.supernews.com:
>
> > Hello,
> >
> > We have a very large set of directories and files on hard disk under
> > Windows 2000 that we need to copy to CD or DVD. However, within this
> > set of directories, NTFS hard links and junctions (reparse points) are
> > used to provide alternate paths to the same files and folders
> > (essentially supporting an object-relational navigation structure
> > within the file system), and we need to duplicate those alternate
> > paths on the CD or DVD.
> >
> > The CD/DVD burning applications that I have tried all appear oblivious
> > to hard links and junctions, blindly following all paths through to
> > their lowest levels, and creating multiple copies of my files as a
> > result. That is unacceptable because the tremendous number of
> > duplicate files that are produced *greatly* expands the volume of data
> > that needs to be recorded, exceding the capacity of the media. Also,
> > this situation makes it impossible to re-create the original structure
> > when copying from the CD or DVD back to the hard drive.
> >
> > Whereever possible, normal Windows shortcuts are used for our
> > application, and those don't cause any problems. However, shortcuts
> > aren't an acceptable substitute in the situations where we use NTFS
> > hard links and junctions. Among other reasons, Windows doesn't support
> > searching through a shortcut to the linked file or folder, while this
> > works fine with hard links and junctions, and that is a critical need
> > for us.
> >
> > I know that the Rock Ridge extensions to the ISO9660 CD file system
> > support both hard links and symbolic links. For our purposes, either
> > one would be an acceptable substitute for the NTFS hard links and
> > junctions that we are using, although hard links would be a more
> > directly equivalent representation.
> >
> > 1. Does anyone know how it would be possible and what software could
> > be used to replicate our file and directory structure onto CD or DVD,
> > *including* actual hard links in the CD file system as substitutes for
> > our NTFS hard links and junctions?
> >
> > 2. Conversely, if the desired file and directory structure including
> > hard links can be created on CD/DVD, then does anyone know how it
> > would be possible and what software would be required to replicate
> > this structure back onto hard disk, substituting NTFS hard links and
> > junctions where required?
> >
> > Thanks greatly in advance for any help.
> >
> > s/KAM
> >
> >
> >
> >
> >
>
> Problem is Rock Ridge is UNIX only. I don't know of anything for Windows
> that supports junction points on CD/DVD. Since it would have to include
> both file system extensions and burning support I doubt anyone has done
> that on their own.
>
> Joe had mentioned using a backup program. The only other type of program
> I can think of is something like Winrar or Zip file. However I don't
> know of any programs that support junction points but that should be
> possible to do.
>
> Leonard Severt
>
> Windows 2000 Server Setup Team
>
> --
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
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