By AOMEI / Last Updated February 27, 2020

Need to make partition bootable in Windows 7

Boot partition, also known as boot volume, is the disk partition that contains the boot loader and necessary files for the Windows operating system. It is the prerequisite to start a computer normally. A suitable boot partition does not only need to contain the related bootable data, it also needs to be marked as an active partition.

For each OS you install, you’ll have boot partitions for each. If you have multiple systems in one disk and you only want to load the appropriate operating system, then you can make the related partition bootable by setting the partition active. But meanwhile, other partitions cannot be set as an active partition because one disk can only has one active partition.

Besides, set active partition is often used when your computer fails to boot. If your computer can’t boot, you should first check if the boot partition is set as active. If not set, you must mark this partition as active to make partition bootable in Windows 7.

Solutions to make bootable partition in Windows 7

How to create boot partition in Windows 7? Here, three efficient methods are listed. Within your own circumstances, choose a solution that will be satisfying for you.

Solution 1. Use Diskpart to create boot partition

Step 1. Press Windows logo key + R to open Run box. Then type diskpart and click OK.

Run Box

Step 2. Type the commands below into the Command Prompt one at a time and press Enter after each command.

  • list disk

  • select disk n (replacing n with the number assigned to the relevant drive)

  • list partition

  • select partition n (replacing n with number of the partition you want to set as active)

  • active


Step 3. Your partition is now active. Type exit, press Enter and then restart your computer.

Solution 2. Use Disk Management to set partition bootable

Step 1. Press Windows logo key + R to open Run box. Type diskmgmt.msc and then click OK.

Step 2. Right click the partition you want to set as active. Then choose Mark Partition as Active.

Disk Management

Step 3. Wait for the process to finish and then restart your computer.

Although the two methods noted above can make partition bootable in Windows 7, you must be very careful when using them, as data loss will occur if you make a mistake in the process. Moreover, you aren’t allowed to return to the previous step in the use process. For your data security, the third method is highly recommended.

Solution 3. Use the best partition manager to set partition active

Things get easier and safer when you use AOMEI Partition Assistant Professional. This is a comprehensive partition manager that enables you to make partition bootable in Windows 7/8/8.1/10/Vista/XP effortlessly.

It has a feature called Set Active Partition that allows you to mark a partition as active in 3 easy steps. Cancelling the current operations is also very simple to operate. By using this utility, you also can fix mark partition as active greyed out. Now, let’s look at the detailed steps.

Step 1. Right click the primary partition you want to set as active. Click Advanced and Set Active Partition subsequently.

Set Active Partition

Step 2. Click OK to continue.

Confirm Set Active Partition

Step 3. Confirm your operations and then click Apply and Proceed.

Apply Proceed


  • Only a primary partition can be marked as active. Other partitions can’t be set as active. Otherwise, your computer will stop working. If there is no primary partition, you can convert logical partition to primary partition.

  • Make sure the partition contains the loader or boot files such as “boot.ini”, “ntldr”, “bootmgr” or “BCD” before marking it as active.


This tutorial contains three practical methods to help you make partition bootable in Windows 7. They are Diskpart, Disk Management and AOMEI Partition Assistant Professional respectively. It is suggested that you use the third method as it is easier and safer. Besides, this utility can solve various problems, such as migrating OS to SSD, converting MBR to GPT, and so on.