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I got an Unknown Partition after I QTparted a windows XP NTFS Partition using knoppix 3.6

I have a 40gb Hard drive with 2 partitions --- about 20gb each for drive C: & D: ---> both NTFS... Im running Windows XP Professional (w/ service pack 2)...My windows and all my programs are installed in drive C: and I only use drive D: to save my documents and files. I've decided to dual boot Fedora Core 2 using my free space in drive D:. I defragmented drive D: first then I booted up Knoppix 3.6 and use QTPARTED. I resized drive d: and made another 10Gb partition. I committed the changes and I rebooted. What happened is Windows Explorer still sees Drive D: but when I try to double click it , it says "Drive not formatted". I also checked through windows XP's disk management console and it says drive d: as a "healthy" partition but has "unknown" filesystem. Its size was reduced  as expected and another 10Gb partition is also present as a result of QTparted. I know that my DATA is still intact in drive d: since I only resized it and I did not format it. Right? What can I do to set drive D:'s file system to NTFS so that I can access it? or what tool can i use to recover my files? All my important files are in drive d: and i know im foolish enough not to backup those files...Help pls...

btw I also tried to boot from knoppix and tried to mount drive D:. It also says something like partition type not specified. i tried to mount it with NTFS type but still it wont mount. I then continued to install Fedora Core 2 and Disk Druid sees drive D: as NTFS/HPFS. I installed Fedora on the 10gb partition and now I can dual boot. Still I cannot mount drive d: in fedora coz i also got the same message from knoppix with unknown filesystem type....

Thnx in advance....
2 Solutions
c&p'ed from another Q:

I have had limited success recovering partitions using
linux fdisk, either by toggling the partition type or creating
a new partition over the existing RAW partition that has
exactly the same start and end positions, and is the same
filesystem type.

Alternatively, the trialware (but functional) program at
http://www.terabyteunlimited.com/bootitng.html has an
interestingly competent partition undelete function.
MS have a great tool within Windows XP which can be of a great help to you with your current problem. In my opinion, the second (D) partition is unmounted thus unallowing you to access the partition properly.

To access 'diskpart' utility do the following:
Enter command prompt (Start => Run... => type 'cmd' and press 'Enter').
Within command prompt type: 'diskpart' and press 'Enter'.
Now, type 'list disk' and press 'Enter' to view the list of drives installed.
Type 'select disk <the drive's letter>' and press 'Enter'.
Type 'list volume' and press 'Enter' to list all the volumes available on the selected drive.
Type 'select volume <volume number>' and press 'Enter'.
Type 'assign [mount=D:\]' and press 'Enter'.
Type 'exit' and press enter twice to exit diskpart and command prompt and restart your computer...

Good luck

MedsAuthor Commented:
Thnx fatcontroller for the link to a great tool! First, I tried Cyber-Dude's answer and I was able to see my partitions but it still it didn't work since the partition is unknown and Drive D: is already mounted. But anyway im sharing him 100 points for the effort. Thnx! I really appreciate it. And then I tried the link given by fatcontroller, booted it up on a diskette, I tried to delete drive d:'s partition and then I undelete it and Boom! It works like a miracle. I was now able to browse my lost files and windows explorer again can browse drive d:. No files were lost! Again thnx guyz! You're a life saver! Have a nice day! =)

I have mistakenly given the wrong grade.... I clicked grade B but it should be Grade A...Excellent!

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