Does Windows Update (for Windows 8 at least) update the MBR and, if so, how?

I ask because I've learned (the hard way) that if you use software that locks the mbr (in my case Rollback RX), then after performing a windows update, sfc /scannow will tell you that nearly all the updated files are "corrupt". Conversely, if I
perform the same exercise without Rollback installed, I get no errors or corruptions.
I speculate that the update must be doing something similar to what is supposed to happen in the TCM scheme, with a hash table or something similar held in the mbr, which gets updated at the time of the windows update, to store the signatures of the revised
system files or whatever, so that the system can verify file integrity as it loads them during the boot.
But I can find no evidence to support my speculation. Clearly something like that must be happening or we wouldn't see the alleged corruptions when using a locked mbr.
Any ideas?

Hi,
According to your description, You Windows update installation corruption obviously caused by
Rollback RX. But that does not mean Windows update installation is relate with MBR. It is probably this software had a compatibility problem with Windows 8. I would like to recommend you to contact
the vendor of this software to verify the compatibility of this software.
MBR:
the most important data structure on the disk, is created when the disk is partitioned. The MBR contains a small amount of executable code called the master boot code, the
disk signature, and the partition table for the disk. At the end of the MBR is a 2-byte structure called a signature word or end of sector marker, which is always set to 0x55AA. A signature word also marks the end of an extended boot record (EBR) and the boot
sector.
You can refer to the link below for more information about MBR:
http://technet.microsoft.com/en-us/library/cc976786.aspx
Roger Lu
TechNet Community Support

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