![]() ![]() Type the identifier in the correct format: in hexadecimal form for an MBR disk or as a GUID for a GPT disk. The specified identifier is not in the correct format. If you have given the wrong format ID, the prompt will display the error: 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.įor example, you can set the new id as uniqueid disk ID= 1456ACBD. Type this command to display the disk’s signature: Uniqueid disk 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 xįor example, if you type the command select disk 1, the command prompt will display the message as Disk 1 is now the selected disk. ![]() ![]() Type the following command to display all the available disks on the system: list disk Type the command Diskpartto open Diskpart and hit Enter. Open Command Prompt and Run as Administrator. On selecting the option Online, Windows will generate a new disk signature. Select Online command from the drop-down menu. Right-click on the disk that is marked as Offline or Missing. Change Disk Signature with Disk Managment Utility We next explain how to fix the Disk Signature Collision problem. You can also make use of Windows Disk Management Utility to change the signature. To fix the disk collision problem, you can make use of the command-line utility called diskpart in Windows PowerShell or Command Prompt to view and change the signature, or can make use of the Master Boot Record in the Windows Registry. This disk is offline because it has a signature collision with another disk that is online.The disk is offline because it has a signature collision.The boot selection failed because a required device is inaccessible.You may run into the following disk collision error messages in Windows 11/10. When two storage devices have an identical disk signature, the secondary drive that creates disk signature collision will be turned offline, and cannot be mounted for use till the collision is fixed. However, in the case of Windows 7, Windows 8.1, Windows 10 and Windows 11, Disk Signature Collision is handled differently. How to fix Disk Signature Collision on Windows 11/10 In the older Windows versions like XP and Windows Vista, the signature collision would often go unnoticed as the Windows system would automatically replace the signature of the disk that reports duplicate signatures. The occurrence of disk collision is rare as the Windows system doesn’t allow two disks to function at the same time when they have a similar disk signature. When you use both disks having identical signatures at the same time, you may run into the Disk Signature Collision problem. As these are identical copies, the chances are that these copies may have identical disk signatures. The physical hard drives are virtualized to create virtual hard disk drives, and several virtual machine clones are created with the existing Virtual hard disk drives. Also, many virtualization tools are being used to virtualize the physical hard disk drive. Drives are cloned to make a similar copy to use both the cloned copy and original drive together. Nowadays, Disk cloning has become quite a common practice for upgrading to a larger hard disk drive. 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. The unique disk identifier is stored as part of the Master Boot Record (MBR). In order to differentiate between storage devices on your computer system, each storage device is tagged with a unique number called Disk Signature for identification. Storage devices are an important part of the computer system for saving, porting, and extracting data files. ![]()
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