Solving disk offline issue in Windows

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You may experienced a message "The disk is offline because it has a signature collision with another disk that is online" / "磁碟簽章發生衝突" in Windows. The case for myself is switching two RAID-1 drives back to non-RAID devices, where the two drives will become identical and cause the collision problem. The following is the solution to turn on the offline disk:

c:\>diskpart
c:\>list disk (you may see your offline disk is in the list)
c:\>select disk 1
c:\>offline disk
c:\>online disk


Reference: http://beddingmall.blogspot.com/2011/01/blog-post_04.html

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