fixboot utility updates the bootsector code of a desired partition. The command is only available inside the Windows Recovery Console.
fixboot utility is the Windows 2000 and XP tool used to update the partition bootsector code which is responsible for loading and running a NTLDR bootloader.
The options are as follows:
Updates the partition bootsector code of the partition specified with the drive letter. It doesn’t update the bootsector code if volume with a specified letter doesn’t exist or if a volume with a specified letter isn’t connected to a primary disk partition.
The fixboot utility exits 0 on success and 1 if an error occurs.
Update the partition bootsector of a drive labeled C:
fixboot utility is compatible with Windows XP and Windows 2000 as well as Microsoft Server 2003.
fixboot utility was superseded by
bootrec.exe /mbr in Windows Vista.
fixmbr – utility used to update the master bootsector (MBR).
bootrec – Windows Vista equivalent of the fixboot utility.