How to change the drive letter for CD drive on Windows 7? I want to map network location to the letter that is currently used by my CD drive.
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Right click on the Computer icon on the Desktop and select Manage option.
Select Storage > Disk Management or just run diskmgmt.msc (administrative rights needed).
Right click on the CD/DVD icon in the Disk (bottom) panel and select Change Drive Letter and Paths.... If there is a readable disc inserted, you can also select its mounted volume in the top panel.
Change the letter and select OK.

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For future readers, I had what appeared to be a CD drive showing up in Windows Explorer taking up a drive letter, but it didn't show up in Disk Management. It turned out to be Power ISO software I had installed. I just right clicked the drive and changed the Power ISO option to free up that drive letter. – Ben Jun 05 '13 at 20:12
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2Would just like to add (only because mine wasn't showing up) that there must be a disk in the CD/DVD drive for it to show up in the Disk Management area. – Nov 17 '10 at 15:42
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2"there must be a disk in the CD/DVD drive" this is a VERY useful hint. thank you @user55925 – anion Nov 18 '17 at 22:21
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1Nowadays (or on my Windows 10 21H1 installation with an USB CD/DVD drive) it is not required to be a disk inside, it is shown anyway. – lucasvc Feb 17 '22 at 07:51
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There was never a need for a disc to be in the drive, but in that case you can also change the letter from the Volumes panel. I've updated the answer. – efotinis May 14 '23 at 11:02