In rare cases, it may be necessary to temporarily give a drive letter to the system partition. This could become a problem if more than one Windows installation (specifically with older versions) is present on your system. Make sure the boot partition is the only partition marked active. Make sure the partition is marked as active (using diskpart or diskmgmt.msc). If the above did not resolve the issue, there may be a problem with the boot partition. Problem with the system reserved (boot) partition Restart the server, and try installing the service pack again. Open an elevated command prompt, and run DISKPART.Įnable the automount policy: DISKPART> automount enable This can occur if the volume automount policy was set to disabled, or, in rarer cases, if the BCD database is corrupt or missing, or if something is wrong with the boot partition (where the bootloader lives). Installation of Windows 7/2008 R2 Service Pack may fail with error 0x800f0a12 if access to the BCD was denied during installation, which is required during the installation of the service pack.
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