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We've got a weird problem in a classroom. All computers are on Windows XP Pro and they all have got the same problem: Their DVD drives ain't visible in Windows Explorer.

The drive is visible in device manager. When we install Total Commander, the drive is visible in it and works correctly. It seems that the DVD drive works perfectly just anywhere... except the Windows Explorer. What is the reason? What system setting can hide DVD from Explorer?

(The computers were installed by our IT administrator, not me. But he doesn't know what is the cause of this problem, so I try to ask here.)

Update: When I manually enter D: to address bar in Explorer, I can access the drive. But then if I go one directory up, I still don't see the drive in the list of drives. So the drive works even in Explorer if one knows it's drive letter. Just not visible.

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Can you see an assigned drive letter for DVD drives in Disk Management snap-in on MMC? –  The_aLiEn Feb 16 '12 at 6:11
    
@The_aLiEn: I am not an administrator, so I can't run disk management tool. –  Al Kepp Feb 16 '12 at 12:57

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up vote 3 down vote accepted

Sometimes your Group Policy settings hide certain drives from Explorer. If that's not the issue, you could try going into the registry and looking through HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Policies/Explorer — there's something in there about hiding drives (I can't remember the specific key).

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I can see there HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Policies/Explorer\N‌​odrives = 8 which hides D: from Explorer. Unfortunatelly the value appears to be read only. Does it mean that it is enforced group policy? +1 –  Al Kepp Feb 16 '12 at 13:15

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