Assign Drive Letters

However, as a slight mistake in Registry may cause data loss or system crash, it is very necessary to backup the registry before doing any modification.Then, launch Regedit, navigate to HKEY_LOCAL_MACHINE\SYSTEM\Mounted Devices, and see if a device is shown as being mounted at the specific drive letter.After getting a basic understanding of the second scenario, next, let’s see the third one.

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If not, programs relying on the original letter might not work correctly.

If the original letter has been taken by new drive, change the letter of the new drive to another available letter and then allocate the released one for the target drive.

Of course, the same issue can be found in other websites or forums since this is a quite common error. The following screenshot shows the 465GB NTFS partition on Disk 1 has the letter E: If I want to use the partition normally, I have to assign drive letter every time, which is so troublesome.

After lots of searches on Google, I found this error often occurs on Western Digital hard disk, so it may be a bug of WD hard disk.

The most probable reason may be that this letter is reserved for a removable device that was removed or is hidden.

Under this situation, if you want to assign the very letter for the specific drive, you may need to make some modifications in Registry.The remaining drive letters can be assigned to other disk partitions, removable devices and mapping network drives in accordance with actual demands. Once a letter is allocated to a disk partition or mapping network drive (letter for removable devices is changeable), we can say it is fixed unless we change or remove it in Disk Management, Diskpart, or some third-party programs.However, one day we may find these fixed drive letters are missing in either Windows Explorer or Disk Management, which brings much inconvenience or even makes the partition inaccessible.But one day we suddenly found all drive letters disappear, which is so strange though this brings nearly no influence on system running and data access: What’s wrong? How can we get these lost drive letters back in several steps? The most probable reason may be that you or someone hide drive letters via making settings in Windows Folder Options.To fix this issue, please take the following steps (take Windows 7 for example): Then, select the "View" tab and scroll down the sliding handle to the middle until the "Show drive letters" appears.Click "Apply" button on the top to apply the change if the missing drive appears in Partition Wizard.When Mini Tool Partition Wizard shows it succeeded in applying the operation, letter of the partition will be visible in Disk Management, and the missing drive will also appear in Windows Explorer.Therefore, when a certain drive loses its letter, we can try adding a drive letter in this way.But for successful adding, you may need to pay some attention to the following tip: Tip: You’d better assign the drive with the original letter.As we know, Disk Management is a Windows snap-in partitioning program designed to help Windows users manage disk and partitions.In Disk Management, every drive should have a drive letter, but sometimes we may find one or some of drives lose their letters like this: As a result, we are unable to access files saved in it directly, and all programs relying on the drive letter will be unavailable.