Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I installed Windows 7 Ultimate and it worked well. But I realized that I needed Windows 7 Professional. I installed the new edition. Then I tried to defragment my HDD (I use Ashampoo Winoptimizer 7), but I couldn't see my D: partition. Windows Disk Management recognized that drive D: has 100% free space. In Explorer I see the files on it and I can use it like my other partitions.

Why can't Windows Disk Management see that my D: drive isn't just free space?

share|improve this question
Windows 7 Ultimate contains all the features of Professional thus there is no reason to downgrade. Windows does not have "partition magic". Besides the useless information your question is confusing... If my answer doesn't help you, try to make your question more clear. – Tom Wijsman Jun 27 '10 at 14:59
English? (15 chars) – Hello71 Jun 27 '10 at 16:09
This question was in fact re-asked, rephrased as requested in the comments, here, a day later. – JdeBP Mar 8 '11 at 23:03
I've just corrected the English in this question. What use is a question if no one can understand it? – Jonathan Reno Sep 10 '12 at 18:34
  1. Back up your Important data first

  2. Run chkdsk on the partition with free space problems.

share|improve this answer

Try a free defragmentation program like MyDefrag to see if the same problem occurs there.

share|improve this answer
Maybe it's worth to mention that MyDefrag uses the Windows Defragmentation API. – Bobby Jun 28 '10 at 10:40
Try Defraggler instead – D'Arvit Jun 28 '10 at 10:43
Bobby, those things are mentioned on the site and he should just try an alternative to see if it occurs there. D'Arvit, if he can see the files using Windows, then a defragmentation program that uses the Windows Defragmentation API will see the same and thus see it. – Tom Wijsman Jun 28 '10 at 11:52

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.