If you change the drive letter of a drive where Windows or apps are installed, apps might have trouble running or finding that drive. For this reason we suggest that you don't change the drive letter of a drive on which Windows or apps are installed. Open Disk Management with administrator permissions. To do so, select and hold or right-click the Start button, and then select Disk Management.
In Disk Management, select and hold or right-click the volume for which you want to change or add a drive letter, and then select Change Drive Letter and Paths. If you don't see the Change Drive Letter and Paths option or it's grayed out, it's possible the volume isn't ready to receive a drive letter, which can be the case if the drive is unallocated and needs to be initialized.
Or, maybe it's not meant to be accessed, which is the case of EFI system partitions and recovery partitions. If you've confirmed that you have a formatted volume with a drive letter that you can access and you still can't change it, unfortunately this topic probably can't help you, so we suggest contacting Microsoft or the manufacturer of your PC for more help. To change the drive letter, select Change.
If you still can't get Disk Management to open but regedit works then you can make an educated guess as to which DosDevice entry is your desired target and change its letter and try rebooting. If you don't have success first time then repeat the process with each DosDevice entry until you get the right one. Another option you can try is to just delete entire lines in the MountedDevices key, which will force Windows to completely rebuild them on reboot.
You can in fact delete the entire contents of MountedDevices except the first line and this may well do the trick, as in the absence of any previous letter allocations it is normal procedure for Windows to make its own partition the C: drive. Clearing out the MountedDevices key is something that can be done in a fully functioning Windows install in order to try and cure certain letter allocation problems, or as a preemptive step before moving Windows so that letter allocation problems are avoided.
Please be acutely aware however that in normal circumstances changing or deleting items in the MountedDevices key should not be tackled lightly and it is only safe under certain conditions. In our case here with an already non-booting operating system we have little to lose and we should still be able to recover things manually by changing each line individually till we get it right and give our partition the correct letter.
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Do you know your Format, Style and Type? Don't use the procedure that's described in this article to change a drive on a computer where the drive letter hasn't changed. If you do so, you may not be able to start your operating system.
Follow the procedure that's described in this article only to recover from a drive letter change, not to change an existing computer drive to something else. Back up your registry keys before you make this change. This article describes how to change the system or boot drive letter. Usually it isn't recommended, especially if the drive letter is the same as when Windows was installed. The only time that you may want to do so is when the drive letters get changed without any user intervention.
It may happen when you break a mirror volume or there's a drive configuration change. This situation should be a rare occurrence, and you should change the drive letters back to match the initial installation. To change or swap drive letters on volumes that can't otherwise be changed using the Disk Management snap-in, use the following steps. In these steps, drive D refers to the wrong drive letter assigned to a volume, and drive C refers to the new drive letter you want to change to, or to assign to the volume.
This procedure swaps drive letters for drives C and D.
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