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I have clean install of Windows 7 x64 with two SATA hard drives. When I open My Computer, I can see only the drive where Windows are installed (and all partitions), but I don't see the other one.

When I go to disk manager, I can see that both drives are detected and the one that I don't see in My Computer is also marked as Primary, but when I right click, the Open and Browse are gray.

I also checked drives with gparted on live Ubuntu and they both seem to work correctly, the second drive wasn't marked hidden or anything else. Before installing Windows 7, I had Windows XP, where both drives worked properly.

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up vote 3 down vote accepted

Right click on the drive in disk manager and see if you have the option to map it to a drive letter.

If that doesn't work, can you please take a screenshot and attach it to your original question.

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thx, assigning letter worked – Jakub Arnold Nov 3 '09 at 2:09
Cool! Happy to help! – William Hilsum Nov 3 '09 at 2:14

I had this problem this is how I fixed it.

Control panel > Administrative Tools > Disk Management - You'll see the disk with an exclamation mark - it is a foreign disk, righ click and select Import Foreign disk.

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I had a problem that windows for some reason unassigned my drive's path letter... repaired this by doing:

Control panel> All Control Panel Items > Administrative Tools > Computer Management > Storage > Disk Management -> Change letter and path to unit (not sure if this is really what it says because i use Spanish windows[cambiar letra y rutas de acceso a la unidad]).. fixed it!

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Control Panel ⇨ All Control Panel Items ⇨ Administrative Tools ⇨ Computer Management ⇨ Storage ⇨ Disk Management

You should see it listed and you will then need to make a new volume. This does not in any way address Raid. This is simply how I found it in my system. I have a standard EIDE drive as my OS drive, then added a larger HDD for storage. Being new to Windows 7, this helped, but it missed a few parts I had to find.

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