By Emily / Last Updated December 11, 2019

Why does partition get lost in Windows 10/8/7?

Typically, we need to partition a storage device into one or multiple partitions before it can be used to store data. Partition is useful area and used for keeping operating system and users’ data.

If one partition gets lost, deleted or corrupted, you will be unable to access all files in that partitions. So, when you delete partition using Disk Management, you will receive a prompt message saying “Deleting this volume will erase all data on it. Backup any data want to keep before deleting. Do you want to continue?”. No users want to suffer from the data loss issue. However, partition might get lost due to many factors including:

  • Improper operation during OS installation: when you asked whether to keep the previous partition on hard drive during system installation, you choose NO and partition gets deleted.

  • Abrupt power outage: the power failure can cause various issues to partitions, and one might be partition loss.

  • Virus infection: if the partition is infected by the virus, it can also get lost.

  • Bad sector: a hard drive that contains bad sectors might become empty.

  • Drive letter loss: if one partition is without a drive letter, this partition will not show up in Windows File Explorer.

  • Clean command: when you execute a “clean” command on the hard drive in Diskpart, the partition will be deleted and the files will be erased as well.

Is it possible to get back lost partition?

Many users might wonder if it is possible to get back lost partition. Actually, that mostly depends on the real culprit behind the partition loss issue.

If your partition is deleted by accident, it can be restored because when a partition gets deleted, the system just removes partition information from the partition table without completely wiping the hard drive area. And whether a partition can be recognized by the system depends on the partition table and boot sector. So, it is possible to get back lost partition.

Besides, if your partition is lost simply due to drive letter missing, you can easily get it back via assigning it an available drive letter again.

How to get back lost partition in Windows 10/8/7?

Above we discuss which conditions we can restore lost partitions in Windows 10/8/7. Now we introduce two methods to get back lost partition for each condition.

Method 1. Get back lost partition via partition recovery software

If your partition gets lost because of mistaken deletion, you cannot see this partition in File Explorer. Fortunately, the partition space becomes unallocated only in Disk Management without being completely wiped.

In this situation, you can use professional partition recovery software: AOMEI Partition Assistant Professional, which allows you to find the lost partition together with its files in Windows 10/8/7/XP/Vista (32-bit and 64-bit). It provides two ways to search the lost or deleted partitions.

Fast Search: this method will quickly find out deleted or lost partitions. If you cannot find the lost partition via this method, you can use “Full Search”
Full Search: this method will deep scan all sectors on a hard disk to furthest find out all of lost partitions.

✍Importance: To ensure the partition recovery success, please don’t write new data onto this partition or reformat it after you find it lost.

You can download the Demo version to have a try first of all.

Step 1. Open Disk Management and remember the size of the lost partition so that you can easily identify it during the lost partition recovery process.

Step 2. Install and run AOMEI Partition Assistant Pro, click on “Partition Recovery Wizard” under “Wizards” list.

Partition Recovery Wizard

Step 3. In the subsequent window, choose the disk which contains the lost partition and click “Next”.

Select Disk

Step 4. In this window, choose a search method based on your requirements and click “Next” to continue.


Step 5. Find out and tick the lost partition from the given list and click “Proceed”.


Step 6. When you see the word “Congratulations”, the deleted/lost partition has been recovered successfully. Then you can click “Finish” to exit.


Then you can go back to Windows File Explorer and the lost partition should show up there now.

Method 2. Get back lost partition using CMD

If you partition gets lost just because it is lack of a drive letter, you can assign one again through Command Prompt:

Step 1.Type cmd in the search box, right click the Command Prompt icon and select “Run as administrator”, then in the pop-out window, type “diskpart” and press Enter.

Step 2. Type the following commands in sequence and hit Enter after each one.list disk: every disk connected to your computer will be shown.

  • select disk #: # stands for number of the disk contains the lost partition.

  • list volume: all partitions on the selected disk will be listed.

  • select volume #: # stands for the number of the lost partition.

  • assign letter=h or other available drive letters.

Then you will be able to see this lost partition get back in “My Computer” or “This PC”. Also, you can assign a drive letter via Disk Management.

Bottom Line

Now, you must know how to get back lost partition on Windows 10/8/7. AOMEI Partition Assistant Professional can restore lost partition on external hard drive. Moreover, if the system partition is lost and causes Windows unable to boot successfully, it even supports to create a bootable CD and then recover accidentally deleted boot partition under Windows PE environment.

Most importantly, the AOMEI Partition Assistant Server can recover deleted partition in Windows Server computer.