Computer Support Blog

Ways to Get the Missing Drive Letters Back in Windows

Does your drive letter suddenly disappear or get missing in your explorer or disk management? On this page, several effective solutions will be provided to help you to solve the drive letter missing problem. Read on and find the suitable solution for you.

Drive Letters Are Missing from Computer

"I upgrade to Windows 10. When I click on 'This PC' from the Start menu, my drive letters are missing from Windows Explorer. I can't find the drive letter in the disk manager either! Is there anybody can help me? I am really troubled by this situation."

Drive Letter Disappears in Disk Management

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.

Here we can see the 188.38GB NTFS partition does not have a drive letter. Generally, if a partition is not allocated with a letter in Disk Management, it will be invisible in Windows Explorer:  

As a result, we are unable to directly access files saved in it, and all programs relying on the drive letter will be unavailable. Therefore, under this situation users would be more eager to get the missing drive letter back. 

Then, let’s see how. 

Steps to Get Missing Drive Letter Back in Disk Management

In Windows Disk Management, the function "Change Drive Letter and Paths", which appears in the right-click menu of a partition (Windows calls it volume), can help add, change, and remove drive letter: 


If "Remove" is selected and applied, the letter of the target drive will be removed and disappear in Disk Management, which is one of reasons for losing drive letter. On the contrary, by clicking "Add", we can assign a letter for the selected drive. Therefore, when 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. 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.

In addition, partitions hidden via special technologies (set partition type ID to 0x17, for example) are always having no letter. If a partition is hidden, the function "Change Drive Letter and Paths" for this partition in Disk Management will be unavailable (grayed out). At this time, the best solution is to unhide the partition by using third party program. If you failed to assign a letter for your drive in Disk Management, now try using MiniTool Partition Wizard Free edition to unhide partition, which is a freeware for Windows home users. 

Step 1. Run and launch the freeware to get its main interface: 


Step 2. Select the hidden partition and click "Unhide Partition" from the left action panel. 


Step 3. Select a letter for the partition and click "OK". 

Step 4. Click "Apply" button on the top to apply the change if the missing drive appears in Partition Wizard. 

When MiniTool 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. 

After getting a basic understanding of the second scenario, next let’s see the third one. 

Drive Letter Missing from the List of Available Drive Letters

I have said it is very easy to add or change drive letter for certain partition in Disk Management, but sometimes you may find such a strange situation where a specific letter is not shown in the list of available drive letters and no other device has that letter assigned. 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. 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. For detailed steps, please see How to Backup and Restore the Registry in Windows

Then, launch Regedit, navigate to HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices, and see if a device is shown as being mounted at the specific drive letter. Next, right click the drive letter that you want and choose "Rename" from the right-click menu to change the letter to any other unused letter, which will free up the selected one. 


After reboot, you can add the released letter for your drive. And next, let’s see the fourth reason for losing drive letters. 

Drive Letter Disappears after Reboot

When browsing Windows Forum and Windows Seven Forums (2 well known technical forums about Windows) I found a lot of people were talking about the problem that drive letters disappear after every reboot. Of course, the same issue can be found in other websites or forums since this is a quite common error. Next, let’s see an example coming from Windows Seven Forums. 

The following screenshot shows the 465GB NTFS partition on Disk 1 has the letter E: 


However, after every reboot, the letter will be missing: 


If the user wants o use the partition normally, he has 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. And someone gives the suggestion: fill the disk with zero MiniTool Partition Wizard, which is a freeware for Windows home users, can help complete this task in very simple steps. 

However, before zero filling the hard disk, users need to backup all desired files, because this will erase both file system and data. For steps to backup a disk, please see Copy Disk. After the backup has been created, we can wipe the disk without any worry. 

Firstly, run and launch the freeware to get its main window below: 


Here we can see all recognized hard disks. To wipe a disk, please select the target disk and click "Wipe Disk" feature from the left action pane to get the following interface: 


There are 5 wiping methods in total, including Fill Sectors with Zero, Fill Sectors with One, Fill Sectors with Zero & One, DoD 5220.22-M (3 passes), and DoD 5220.28-STD (7 passes), and you can choose one of them to erase the hard disk. From the top to the bottom, erasing time increases but the effect is better and better. Then, click "OK" to go back to the main interface: 


From the above interface we can see the entire hard disk 2 becomes unallocated, and there are 3 pending operations on the left side, containing delete partition I, delete partition H, and wipe disk 2. At this time, as long as we click "Apply" button, all changes will be made automatically. Once the disk is erased, we can recreate partitions in either Disk Management or Partition Wizard. And the new drive letters would stay in their original place next time you reboot the computer. 

Now if you have known how to deal with the issue that drive letter is missing after Windows reboot, let’s see the last situation. 

Drive Letter Missing in Map Network Drive

Drive mapping is how operating systems like Windows associate a local drive letter (A through Z) with a shared storage area to another computer over a network. However, these local drive letters may disappear in Windows Explorer without us knowing exact reasons. After a series of findings, we find 2 possibilities:
1.When mapping the drive, users do not check the option "Reconnect at logon". 
2. Use the Work online without synchronizing changes over a virtual private network (VPN) connection. 

Now that reasons are found, solutions are available now. For the first situation, users just need to remap the network drive and check "Reconnect at logon": 


For the second situation, please obtain the latest service pack for Windows, or apply Hotfix to the system that is experiencing the problem. For more details, please see Drive Letters of Mapped Network Drives Are Missing in Windows Explorer of Microsoft. 

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