“Disk ID”

Disk Signature Collision error.

Every storage device is tagged with a unique number called a Disk Signature for identification. The unique disk identifier is stored as part of the Master Boot Record (MBR).
Operating systems use disk signatures to identify and distinguish the different data storage devices, and hard disk drives in the computing system for data access.
Nowadays, Disk cloning has become quite a common practice for upgrading to a larger hard disk drive.
As these are identical copies, the chances are that these copies will have identical disk signatures. When you use both disks having identical signatures at the same time, you will run into the Disk Signature Collision problem.
Windows system doesn’t allow two disks to function at the same time when they have a similar disk signature. One drive will be set Offline
To fix the disk collision problem, you can make use of the command-line utility called diskpart in Command Prompt to view and change the signature
Change Disk signature using Diskpart.
1. Open a Command Prompt and Run as Administrator.
2. Type the command Diskpart to open Diskpart and hit Enter.


3. Type the following command to display all the available disks on the system:
list disk.


4. Now note the problematic disk number with the status Offline from the list and write the following command – where x is the offline disk – to select the offline disk: Select disk x
For example, if you type the command select disk 2, the command prompt will display the message as Disk 2 is now the selected disk.


5. Type this command to display the disk’s signature: Uniqueid disk



6. To change the disk’s signature and set the disk online, type the command unique disk ID= (New signature) where (New signature) is the new ID in hexadecimal.
For example, you can set the new id as uniqueid disk ID= 0010A58E


Once done, the disk will be online. Reboot the system.
To check, repeat steps 1, 2 and 3.