Fixed: Partition Was Not Resized/Shrunk/Extended After Rebooting

Why does partition not change after rebooting?

When your partition changes do not stay after a reboot, it usually means the system is blocking the write operation or redirecting the changes to a temporary place. This can happen because of restore software, virtual machine settings, write protection, partition table problems, or even hardware issues. Below is a simple table that shows the most common reasons and how to fix them.

Reason	What happens	Fix (simple steps)
Reboot-to-Restore software	Changes look successful but are stored in a temporary cache. After reboot the system restores the original state.	Disable or uninstall the restore software before editing partitions.
VM non-persistent mode / snapshots	VM writes changes to a temporary delta file. After shutdown the file is deleted.	Turn off Non-Persistent or Immutable mode; avoid auto-reverting to snapshots.
Disk write protection	Disk is locked by a physical switch or system policy, so partition table cannot be saved.	Check physical unlock; run DiskPart and clear readonly.
MBR/GPT desync	System reads one table but you edited the other. After reboot old data appears again.	Use a partition tool to repair and sync MBR and GPT.
Failing hard drive	Drive pretends writes are successful but does not save them. Old data returns after reboot.	Check drive health and back up immediately if failing.
Others	Some operations need PreOS mode. If blocked, the change is not completed.	Create a bootable media and perform operations in WinPE; check ampa.exe; disable antivirus blocking; close apps and remove pagefile.

In most cases, the issue happens because the system prevents permanent changes or redirects them to a temporary environment. If you are using AOMEI Partition Assistant, running the operation in a clean WinPE environment with bootable media usually avoids these problems. By checking the reason in the table and applying the matching fix, you can make sure your partition changes stay after rebooting.

How to fix partition not change after rebooting

Fix 1. Remove disk write protection

CMD, also called Command Prompt, is a built-in Windows tool that lets you manage disks and partitions through text commands. You can use it to format drives, extend volumes, remove write protection, and perform many other disk tasks. Please note that formatting will erase all data on the partition, so having a full backup of important files is strongly recommended. The guide below shows how write protection can be removed from a Windows PC.

Step 1. Hit Windows Key + X on your keyboard, and select Command Prompt (Admin) from the menu. Type diskpart and press Enter.

Step 2. Type list disk and press Enter. Type select disk #(ex: Disk 1) to select the disk which is write-protected and press Enter. Type attributes disk clear readonly to change the disk’s properties so that it is no longer read-only and press Enter.

Step 3. Type exit and press Enter twice to exit Diskpart and Command Prompt continuously. Re-plug your USB flash drive to check if the write protection error is solved.

If this method still does not remove the write protection from your micro SD card or USB drive, formatting the disk becomes the final option. AOMEI Partition Assistant is a disk and partition management tool for Windows 11, 10, 8.1/8, and 7 (both 32-bit and 64-bit). It allows the write protection to be cleared through formatting in just a few steps.

Step 1. Download, install and launch AOMEI Partition Assistant. Right-click on the USB partition and select “Format Partition”.

Step 2. In the pop-up window, you can name the USB drive by editing “Partition Label” and change file system based on your needs. Click “OK” to continue.

Tips: FAT32 ensures cross-platform compatibility while NTFS supports single file size up to 4GB.

Step 3. Confirm “Pending Operations” and click “Apply” to execute the operation.

Fix 2. Check your hard drive

It may be helpful to check whether the hard drive has bad sectors or is starting to fail, as these issues can cause partition changes to disappear after a reboot. If the drive is indeed failing, repairing it or replacing it with a new one through disk cloning would be a suitable approach. Command Prompt can not only format write-protected partitions, but also scan and repair bad sectors on the hard disk. Please refer to the following steps.

Step 1. Click "Start" button and type "cmd" in the task bar, then select "Run as administrator". Type "chkdsk/?" and press "Enter" to list all drives on your PC.

Step 2. Type "chkdsk g:" to test the G drive (you can replace "g" with another drive letter). If you want to repair the errors on the hard drive, you can type "chkdsk g: /f" and press "Enter".

Step 3. You will receive a notice when the target drive is on work: "Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? (Y/N)". Type "Y" to accept it.

To simplify the process, AOMEI Partition Assistant supports checking bad sectors on partitions.

Also, you can use it's Disk Surface Test feature to see whether if hard drive is failing.

Fix 3. Create a bootable USB

When some tasks in AOMEI Partition Assistant, such as extending a partition, merging partitions, or migrating the system, must run in Restart mode, the changes may not remain after rebooting. This usually happens because the running system prevents the operation from completing. Creating a bootable USB with AOMEI Partition Assistant provides a more stable way to finish the task.

This partition tool has a user-friendly interface and you can finish making a bootable USB in fewer steps. The most important thing is you don’t need to prepare a custom image (ISO.file) again because Partition Assistant takes care of that. It provides Create Windows PE Bootable Media to follow. No need to worry about potential mistakes you may make.

What’s more, burn Partition Assistant into a bootable device and boot from a bootable device to manage the hard drive, you can manage a mass of computers without directly installing the software on these machines.

Step1. Install and start AOMEI Partition Assistant. Click Make Bootable Media in the Tools menu.

Step2. Click USB Boot Device to select your USB drive as the path to store ISO file, and click Proceed.

Step3. Click Yes in the pop-up window, and wait for the process completes.

To boot from the Windows PE USB flash drive or CD/DVD, you need to enter BIOS/UEFI by pressing a certain key and change boot order under Boot Menu. And, you may also need to disable Secure Boot under BIOS/UEFI. For different brands of computers, the key to enter into BIOS might be different.

Notes:✎Avoid completing the operations under Restart mode

Please check whether or not there is a file named ampa.exe under the directory of C:\Windows, if not, please reinstall the software.

Please check whether or not it is the anti-virus software that stops the program to add the entry of ampa.exe to registry. If so, please shut down the anti-virus softwares.

Restart the computer to stop all the programs which are running on the target partitions.

Remove the pagefile on the target partitions.

Conclusion

When partition changes do not stay after rebooting, it is usually because the system blocks the changes or stores them temporarily. Checking the cause, such as write protection, restore software, or a failing drive, and applying the right fix can solve the problem. Using AOMEI Partition Assistant in a bootable WinPE environment often ensures that partition changes are completed successfully and remain after restarting.