How to deactivate an active partition?

I accidentally made another active partition on another hard drive. How do I deactivate that partition under windows (XP and Vista)?
Thanks!

Hi,
You can use the following steps to de-active a active partition:
1. Open Command Prompt.
2.  Type: diskpart
3.  At the DISKPART prompt, type:  list disk  (This command will list all the disks that you have)
4.  In the next prompt, type: select disk # ( # means the number of the disk which contain the wrong active partition )
5.  At the DISKPART prompt, type: list partition
6.  Use the command: select partition # (# means the number of the partition that you want to mark as active)
7.  Inactive the active partition with command: inactive
Important Note: We strongly recommend that perform a full backup before this procedure. 
By the way, there is a helpful article about disk management, for your reference:
Mark a partition as active (32-bit only)
http://technet2.microsoft.com/windowsserver/en/library/65982abe-19cc-446b-8027-a00bed65abd91033.mspx?mfr=true
It’s about active a partition. However, the inactive process is almost same.
I hope it helps.
Sincerely,
Guozhen Wang
Microsoft Online Community Support

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