GoBack

Norton GoBack (previously known as Wildfile GoBack, Adaptec GoBack, Roxio GoBack) is a Microsoft Windows based disk utility, that can record up to 8Gb of disk changes. When the filesystem is idle for a few seconds, it marks these as "safe points". The product allows the disk drive to be reverted to any safe point. It does this by effectively undoing all changes made to the disk since the safe point.

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GoBack replaces the Master Boot Record , and also replaces the partition table with a single partition. This allows a hard drive to be reverted even in the event that the Operating System is unable to boot, while also protecting the filesystem from alteration so that the revert information remains correct.

Master Boot Record: In the IBM PC architecture the master boot record (MBR), or partition sector, is the 512-byte (½ kibibyte) boot sector, i.e. the sector on the logical beginning of a hard disk that contains the sequence of commands necessary for booting the operating system(s) (OSes)....

Partition table: redirect disk partitioning...

Operating System: In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. Additionally, it provides a foundation upon which to run application software such as word processing programs and web browsers....