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I just discovered yesterday that my D: partition isn't showing up in the Windows 7 defragmenter.

All my other partitions (C, E, F) are there.

The D: partition is running and working just fine - heck I've even got my users folder there, so the desktop and so forth are on it.

Any clues what might cause this ?

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You could try an alternative defragmenter, such as defragler. – MaQleod Feb 23 '11 at 6:27
True I could, however I'm rather certain the partition being missing is just a symptom of something else. And it's the "something else" I want to fix :-D – Steffen Feb 23 '11 at 6:52
You should upgrade to third party defragmentation software, the windows 7 in-built is good but it is also limited. – user70038 Mar 3 '11 at 17:04
up vote 2 down vote accepted

Force a CHKDSK on that partition and reboot. It may have a dirty bit set and needs to run a scan to make sure defrag is safe.

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+1 Will try it as soon as I get home. – Steffen Feb 23 '11 at 7:34
chkdsk -R did it :-) – Steffen Feb 23 '11 at 20:00
Glad to hear it! – user3463 Feb 23 '11 at 21:41

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