Windows 7 Service Pack 1 (SP1) was released to MSDN and Technet users and will be shortly available for general public. In case you have tried installing SP1 and encountered the Error: 0x800F0A12, then this article will help you solve them. If you receive error “0x800F0A12″ when trying to install Service Pack 1 (SP1) for Windows 7 or Windows Server 2008 R2, it means the installer can’t access the system partition of your computer’s hard disk to update files. Microsoft has detailed on how to solve the issue.
Although the partition is accessible, there might be some situations where it is not accessible;
- The system partition isn’t automatically mounted, or made accessible to Windows, during startup.
- A hard disk containing the system partition was removed prior to beginning SP1 installation.
- Windows is running on a storage area network (SAN), and access to the system partition has been disabled.
- A disk management tool from another software manufacturer was used to copy (or clone) the disk or partition on which you’re trying to install SP1.
In case the system partition is not automatically mounted, then users can run the command prompt in administrator mode and run the command mountvol /E. More details on how to fix the problem is available here.
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