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System Partition Should Be Active Partition for Normal Boot?

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    Issue: There are 2 internal disks on my Windows computer, and I installed Windows OS on one of disks. Due to mistaken operation, I set system disk inactive. As a result, I was prompted to reboot system again and again. Should system disk be active disk?

    Of course, system disk should be an active disk, because it is the disk installing operating system which can manage computer hardware and software resources, and provide common services for computer programs.

    As a matter of fact, there are more than one partitions on a hard disk in most cases. In general, the partition contains the boot loader which is a piece of procedure responsible for booting the OS is called system partition. Only one partition on a hard disk can be set as active, and it should be the system partition which is also a primary partition. Therefore, "should system disk be active disk" actually means "should system partition be active partition".

    If the partition which saves Windows boot files is no longer active or you set a wrong partition as active, your computer will not boot normally, and you will receive an error like this: "Missing operating system", or "Operating System not found".

    Recommended: If you encounter this error recently, you are able to find more causes and solutions in this post: 5 Perfect Solutions to Getting Missing Operating System Back.

    missing os

    You may regard the error as a difficult issue because the computer can’t boot this time. Take it easy, you are still able to start your computer via a professional bootable partition tool and check whether the active partition is set correctly or not. If the settings are incorrect, and then you can set the wrong partition as inactive and mark the system partition as active. Then your computer will run normally if there are no other problems.

    Then, it’s time for you to select a piece of reliable partition manager. Among the similar software, MiniTool Partition Wizard is really a good choice.

    How to Set System Partition Active

    Since your computer can’t boot normally this time, you need to use MiniTool Partition Wizard Bootable CD Free Edition which allows you to boot computer without Windows OS. After you enter the main interface of this software, you are able to set the wrong active partition as inactive and mark the system partition as active. In addition, this software supports Window XP/Vista/7/8/8.1/10 32-bit and 64-bit, which can satisfy most users’ need.

    First of all, you should download MiniTool Partition Wizard Bootable CD Free Edition from the official website and burn it to a USB flash drive or CD/DVD Disc. If you don’t know how to burn it, you can learn the specified steps from this post: How to Build Free Bootable Partition Manager with Pwfree91.iso?

    Tip: "Set Active" and "Set Inactive", two functions of MiniTool Partition Wizard, are only available for the primary partitions in the hard disk with MBR mode partitions.

    Step 1. Connect the bootable device with your computer, and boot computer into BIOS. Then, set the computer to boot from the bootable device, press "F10" to save the change and exit BIOS to enter the next step.


    Step 2. You will see a welcome page of the software. Then MiniTool Partition Wizard will automatically boot in several seconds.

    welcome page

    Step 3. Then you will enter the main interface of MiniTool Partition Wizard. On this interface, you can see that a wrong partition is marked as active. So just select that partition and click on "Set Inactive" from the right-click menu, then the partition will be changed into inactive partition.

    set inactive

    Step 4. Select the system partition, click on "Set Active" from the right click menu, and the system will be changed into active partition. Don’t forget to press "Apply" to save the changes at last.

    set active

    Then, you should close your computer, boot it into BIOS once again and set the computer to boot from the right system disk. If there are no other issues, your computer will boot successfully.

    Twitter What You Find

    With these four simple steps, you are allowed to set the system partition as active to guarantee the normal boot of your computer.

    Recommended: There is another relative post for your reference when you encounter the problem: Here Are 3 Solutions after Accidentally Marking Drive C Active.

    So, next time, when you are facing the similar issue mentioned in this post, don’t hesitate to use this magic software.