How to Mark a Partition as Active in Windows 7

Jonathan_King

Baseband Member
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Marking a partition as active on a basic disk means that the computer will use the loader (an operating system tool) on that partition to start the operating system.


At various times the need to mark a partition as active arises. This will show you two ways of doing so.

METHOD ONE
Through Disk Management

1. Type diskmgmt.msc into the start menu, and press enter.

2. Right click on the partition you want to mark as active, and select Mark Partition as Active.

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That's it!

If you can't boot into Windows, use method 2.

METHOD TWO
Using DISKPART in Command Prompt


1. Boot into your Windows 7 installation or repair disc.

TIP: If you don't have a Windows 7 installation DVD, you can Create a Repair Disc.

2. When you get to the language screen, press Shift+F10.

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3. Enter diskpart, then list disk after diskpart is loaded.

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4. Enter select disk [number of the disk the partition is on].

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5. Enter list partition, followed by select partition [partition number].

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6. Type active.

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There you go! You can now close the command prompt and reboot your computer.

TIP: You can also use this method from within Windows. Type cmd into the start menu and press enter.

METHOD THREE
Through Partition Wizard

1. Download a copy of the Partition Wizard Bootable CD.

2. Boot it up, right-click on the partition, and select Modify>Set Active.

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