The Master Boot Record contains important boot information which are essential to boot a computer system. A corrupted master boot record usually makes a system unbootable until the issue is fixed. Users who installed multiple operating systems might have also experienced difficulties when the operating systems installed their own boot manager which erased another one.
It [...]
Backup And Restore The Master Boot Record
Windows Boot Manager
Many users shy away from installing multiple operating systems on their computer because of problems that can arise in the boot sector. Some operating systems like to replace the existing boot information with their own which would mean that the user would have to find a way to replace or add those boot information again [...]

