How to deal with disk offline signature collision issue?

Why does this error occur

Typically, a signature collision hard drive develops when Windows detects that there are two disks with the same signature. The disk signature (unique identifier (UID)) is stored as part of the MBR and is used by the operating system to identify and distinguish storage devices.

Windows cannot allow two drives with the same signature to run at the same time, so Windows 7, 8, 8.1, and 10 disables the second drive and prevents it from mounting until the driving conflict is resolved. In older versions of Windows (such as Windows Vista and XP), when a collision occurred, the disk signature was automatically changed.

This situation can occur in the following cases:

• When starting a disk that was cloned along with its clone.

• If you created a virtual hard disk from a physical one.

• Use backup software that uses virtualization.

Thus, if you see the message disk is offline because it has a signature collision, then your computer can no longer boot correctly - you need to solve this problem.

2. Use Command Prompt

At the command prompt, type Diskpart and press Enter.

Next, enter: the list disk, this is necessary to display all the disks that are currently in the system.

Next, enter: select disk e (where "e" is the number of the problem disk).

Next, enter: Uniqueid disk to show the disk signature.

Next, enter: unique disk ID = NEW SIGNATURE, where NEW SIGNATURE is the new disk ID.

After each command, be sure to press the Enter key and, if you did everything correctly, Windows will bring the drive online and assign it a drive letter.

If something went wrong, DISKPART will give an error that says: "The specified identifier is not in the correct format, you need to enter the identifier in the correct format: in hexadecimal form for the MBR disk."

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