Troubleshoot: Accidentally Deleted System Partition

Accidentally deleted system partition but don’t know what to do? Get some help on this page with detailed guide to restore deleted system partition.


By Lora / Updated on July 11, 2023

Share this: instagram reddit

"What happens if I delete system partition?"


Accidentally deleted a partition

Hello, I was trying to delete some partitions on my HDD, so I merged them into 1, but one partition was for booting to windows.

When I boot my pc, I get the message "reboot and select proper boot device or insert boot media in selected boot device and press a Key".

What should I do now?

- Question from Tom's hardware


Have you accidentally deleted partitions? Was it a system partition? Don't worry; you are not the only one who suffers from this.

Whether you are using a dual-system PC or a hard drive with only one Operating System, you will never lose a way to fix the problem caused by a system loss.

To settle the issue better and safer, we must learn about system partition prior to the solutions of how to recover accidentally deleted system partition.

What is a system partition?

Every PC needs system partitions to store hardware files to load the Windows. It contains the boot loader as well as other boot files required by the OS.

When the Windows operating system is installed, system partitions are generated by default and are responsible for the starting process.

Broadly speaking, system partitions include recovery and a partition containing safety tools like BitLocker.

A system partition should be a primary partition and be set as "Active". You may have inadvertently deleted system partition if you deleted primary partition, and then you cannot get the PC to boot.


And Sometimes, a system partition can be a boot partition as well.

Can I delete system partition?

Quite a lot of users ask this question. Users all want to keep their hard drives clean and tidy; when the storage space gets full, they usually plan to delete some partitions or files to free it up.

But some users may not know what will bring if system partitions are deleted. Since system partitions store vital files and applications like boot loader, system files, boot files, OP files, etc., you are never supposed to delete a system partition.

Otherwise, you will lose access to Windows. The same will be when you have got the Windows 10 boot partition deleted.

But if things had happened - you have already deleted the system partition, then what to do? Don't worry; though it is relatively hard for an ordinary user to troubleshoot by him or herself, you could turn to professional partition manager software.


Best means to restore accidentally deleted system partition

When you are unaware of partitions, you don't know their structure, functions, and differences; it is better not to attempt to deal with them on your own, which is too dangerous and may cause further damage.

Instead, for safety's sake, you might as well take advantage of a partition management tool, AOMEI Partition Assistant, a professional tool supported by a sophisticated team with advanced algorithms and technology.

Easy. Scan and select partitions to restore in 3 steps. 
Comprehensive. Recover/move/merge/convert/clone partitions as you like. 
Compatible. Support Windows 11/10/8/7/XP/Vista, and almost all file systems.

Using this tool, you could save time and labor and fix the Windows system partition missing issue effortlessly.

Now download AOMEI Partition Assistant Pro Demo to enjoy the free trial.

Download Demo Win 11/10/8.1/8/7/XP
Secure Download

Stage 1. Build bootable media using AOMEI Partition Assistant

Firstly, since the PC will not boot correctly after deletion, the first course of action would be to build bootable media. You could use a USB to load it and then connect it to the unbootable PC to start it.

Prepare the following:

  • Another bootable PC
  • A USB stick
The USB will be formatted to make bootable media. So make sure to transfer the data to a safe place or back it up.

Step 1. Run AOMEI Partition Assistant on another bootable computer > connect the USB drive > Wizards > Make Bootable Media > Next.


Step 2. Choose USB Boot Device > choose the connected USB > Proceed.


Step 3. Click Yes to commit the operation.


After the process, the bootable media will be prepared. 

Stage 2. Restore accidentally deleted system partition effortlessly 

With the bootable media prepared, you could head over to the affected PC and start the troubleshooting process.

This tool can facilitate users to restore deleted partitions from SSD/HDD/ SD card/USB and other internal or external storage devices. It supports Windows 11/10/8/7/Vista/XP and could help all users restore deleted system partitions.

The USB will be loaded with AOMEI Partition Assistant when making bootable media.

Step 1. Connect the USB stick to the unbootable PC > come to AOMEI Partition Assistant interface > Partition recovery wizard > select the affected drive > Next.


Step 2. Select a search method according to your preference. Fast Search is recommended here first. If failed, try Full Search.


Step 3. Choose the system partition > Proceed.


Thus you can restore deleted system partition within only a few simple steps.

FAQ about deleted partition recovery issues

The best way to restore accidentally deleted system partition are ready in this post. To get more info about partition recovery, check the FAQ below.

Lora · Editor
Lora is an editor of AOMEI Technology. She is also a tester and editor of AOMEI Data Recovery Tools. -- "Keep testing, write the most useful tutorials for helping people recover the lost data for Windows and phones" is the most meaningful thing for her. Dedicated to creating helpful tutorials, she hopes her tutorial can assist users to effortlessly solve data loss problems on their personal computers and mobile phones.