_____ is a recovery console command that writes a new master boot record on the hard drive.

• A. Fixmbr
• B. Fixboot
• C. Bootrec
• D. Chkdsk

Answer: (A)

Rewriting the master boot record is a boot-repair action used when the initial boot code of the drive is corrupted. The recovery console provides a command that writes a clean MBR to the drive, replacing the existing one so the system can start properly. That command is Fixmbr. It updates only the MBR itself (the first 512 bytes that contain the boot code and partition table signatures) without altering the partition table. This is different from Fixboot, which writes a new boot sector to the active partition, and from Bootrec, a newer repair tool that can perform multiple boot repairs (including MBR repair with a switch) in newer Windows environments. Chkdsk, meanwhile, checks the disk for file-system and surface errors and does not rewrite the MBR.