Re: Copying NTFS Hard Links and Junctions to and from CD/DVD
From: Leonard Severt [MSFT] (leons_at_online.microsoft.com)
Date: 03/07/04
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Date: Sun, 07 Mar 2004 22:26:43 GMT
"Kevin Myers" <KevinMyers@austin.rr.com> wrote in
news:104j3gmrq1aps47@corp.supernews.com:
> 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.
>
>
>
Your points are well thought out. However I don't know of any plans for
any major changes to NTFS support for hard links and junction points. I
also don't expect a new CD/DVD file system to appear any time soon. As
DVD's get much larger (past the 30 gig planned) then maybe a new common
file system will be done that has many more features than CDFS/UDF. I
expect it might be something 64 bit based to last well into the future
and it would have to be an ISO based standard to be widly adopted.
Leonard Severt
Windows 2000 Server Setup Team
-- This posting is provided "AS IS" with no warranties, and confers no rights.
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