Quit DISKPART stay within the command prompt.Ĥ. Run the following set of commands: DISKPART -> SELECT DISK 0 -> UNIQUEID DISK ID= (e.g. Open a CMD prompt with administrator privileges.Ģ. On systems where the disk signature/ID has not been changed but are still in queue to be so, follow the steps below to change the disk signature and update the Windows Boot manager:ġ. If this identifier gets changed or corrupted, such as in situations of disk cloning or partition removal, a new signature would need to be created so Windows can re-identify and regenerate drive mappings however, the WIndow's boot manager would also need to be directed to this new information or the above error is generated. Causeĭisk signature is a unique identifier Windows uses to remember drive letter assigments. Info: The boot selection failed because a required device is inaccessible. Booting the system with the Windows OS CD and run bootrec.exe scans the volumes and picks up the new ID and corrects the boot issue however, this requires the use of WinPE and multiple reboots causing issues in system automation deployment. After performing a disk signature/id change using a 3rd party utility or Microsoft's DISKPART utitlity, Windows 7/2008 R2 fails to boot with error shown below.
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