By Emily / Last Updated May 6, 2020

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 a piece of area for keeping the operating system and personal data. If one partition gets lost, deleted or corrupted, you will be unable to access all files in that partitions. 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.

Best tool to get back lost partition on Windows PC

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 lost simply due to drive letter missing, you can assign it a drive letter via DiskPart or Disk Management to get it back.

However, if your partition is deleted by accident and get lost, you have to turn to a professional partition recovery tool like AOMEI Partition Assistant Professional, which can recover deleted partition on USB flash drive, SD card, SSD, HDD or other external hard drives. Also, it is able to restore lost partition on an internal hard drive. Besides, two ways are available to search the lost partition.

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.

You can download its demo version and scan through the next section to learn how to retrieve lost partition.

How to get back lost partition step by step?

With AOMEI Partition Assistant Professional, you can restore the deleted partition along with the data you saved on this partition. But to ensure the partition recovery success, please don’t write new data onto this partition or reformat it after you find it lost.

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.

Methods

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

Proceed

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

Congratulations

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

Notes:
If the boot partition is deleted by mistaken and Windows cannot boot, you can first make a bootable media via AOMEI Partition Assistant Professional, and then recover the boot partition in Windows PE mode.
If you need to recover lost partition on Windows Server, the AOMEI Partition Assistant Server can meet your demands.

Bottom Line

Now, you must know how to get back lost partition on Windows 10/8/7. Apart from retrieving deleted partition on both external and internal hard drive, AOMEI Partition Assistant Professional comes with many other fantastic funtions like allocate free space from one partition to another, convert MBR and GPT without deleting partitions, convert dynamic disk to basic one without losing data, clone OS to new hard drive, and more.