hi! i'm new here and i'm having trouble with my HDD.

  I have 30G IDE HDD partitioned into 10G and 20G. On the 10G I installed windows and on the other ubuntu. I had a problem booting into the ubuntu partition and needing to get some FILES from the 20G partition I used a program called Ext2fsd to see the root.disk file (which i wasn't able to). So i changed the partition setting to extended and the hard disk size changed from 20G to 811G. Instead of changing to NTFS it became RAW.
  I tried to change it back to its original settings but to no avail. I also tried to reformat it but it didn't work. But when i look and mount it using the program Find and Mount i could still see the ubuntu INSTALLATION.

  I gave up on GETTING the files back but i need to reformat the second HDD partition to reinstall ubuntu.

  I hope you could give me some input on how to fix this problem. Thanks in advance.Assuming you can still boot the Windows operating system, perhaps you can use it to delete the second partition.  Then you can define a new partition of whatever TYPE and size you need.

If you're working with Windows XP, I believe the disk management utility will permit you to view the current disk structure (and delete the second partition).

To access within Windows XP:
     o  select "Start" ->
     o  right-click "My Computer" ->
     o  select "Manage" ->
     o  within "Storage" category on left pane of "Computer Management" window, select "Disk Management".

Look for information in both the top right-hand pane and the bottom right-hand panes of Computer Management window.
Thank you for the help.

I have deleted and reformatted the partition. CURRENTLY installing ubuntu now.

I'm truly grateful for the help.