See this article, if you've accidentally marked System Reserved Partition as inactive and due to which Windows 10 will no longer boot.

Earlier we shared you following article which explains different disk partitions in Windows:

Understanding Different Disk Partitions In Windows 10

From the above article, we know that System Reserved Partition an important partition which is essential for your Windows operating system. This partition helps Windows to boot as contains necessary boot records. In absence of this partition, BitLocker drive encryption on operating system volume won’t initialize. The System Reserved Partition must be active by default.

Recently, while working with DiskPart command line tool, I accidentally marked the System Reserved Partition as inactive (as you can see in below screenshot).

FIX Accidentally Marked System Reserved Partition As Inactive

After this, when I restarted my system, it failed to boot with “An operating system wasn’t found” error.

FIX Accidentally Marked System Reserved Partition As Inactive

In case if you’re also entered into this situation and doesn’t know how to proceed from here, this article is for you. All you need a Windows 10 bootable USB and you can easily fix this issue with below mentioned steps and you don’t need to reinstall entire OS.

FIX: Accidentally Marked System Reserved Partition As Inactive

1. Plug in your system recovery disc or Windows 10 bootable USB and start your system and press any key to continue.

FIX Accidentally Marked System Reserved Partition As Inactive

2. Then click on Next in Windows Setup screen shown below.

FIX Accidentally Marked System Reserved Partition As Inactive

3. Moving on, click on Repair your computer link in next screen of same window.

FIX Accidentally Marked System Reserved Partition As Inactive

4. Now click Troubleshoot in below shown screen.

FIX Accidentally Marked System Reserved Partition As Inactive

5. Then hit Advanced options entry in following screen:

FIX Accidentally Marked System Reserved Partition As Inactive

6. Moving on, we’ve now arrived in Advanced Recovery Options for Windows 10. Here, click on the Command Prompt option.

FIX Accidentally Marked System Reserved Partition As Inactive

7. In Command Prompt, type these commands (mentioned in bold) and press Enter key after each. Make sure you substitute # with System Reserved Partition‘s volume number.

diskpart
list volume
select volume #
active
exit

FIX Accidentally Marked System Reserved Partition As Inactive

8. Close Command Prompt and continue to your Windows OS or restart the machine.

You’ll find that the problem is resolved and you can boot your Windows without any error.

That’s it!

Also see: Windows 10 Master Boot Record Is Corrupted.

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2 Comments

  • Thanks Kapil you made it so simple for me & now my computer is booting normally. Actually problem started when I tried to delete volume “D” then deleted partition to extend Volume “C” but extend Volume option wasn’t found active when right click Volume “C”. Can you guide me why it is so & how to correct the problem.
    Anyhow, once again thanks for your help.

  • Kapil Arya

    ^^ This is because volume ‘C’ and volume ‘D’ are on different disks.

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