Master boot record
Master Boot Record is the first 512 kilobytes of a partitioned mass storage device such as a hard drive. The master boot record gives the BIOS information on things like partitioning, file systems, location of the operating system etc.
Editing and replacing content[change | change source]
Because the master boot record is crucial for running the operative system, any changes could render the contents of a hard drive inaccessible until it has been fixed In the past there has been instances of malware making changes to the master boot record. One noticeable example of this is CIH