Step 2: Power on the machine and hold the option button until you notice the recovery screen appear. You can also run the command with switches to fix just the master boot record (/fixmbr), the boot sector (/fixboot), or rebuild the entire BCD (/rebuildbcd). Step 1: If there is a trouble with the current hard disk, and you wish to solve it or use the new version of the OS, then plug the bootable external drive to the Mac.
This will rebuild the boot configuration data and hopefully fix your problem. When the System Recovery Options dialog comes up, choose the Command Prompt.Ĥ. Choose the operating system to repair and click Next. Choose the language, time, currency, etc and click Next.
#Master boot record repair external hard drive mac windows
First, load up the Windows Vista disc in your drive and press any key to boot from the disc.Ģ. You have to start up Vista in the Recovery Environment and then run the bootrec command. In Vista, the procedure to fix the master boot record is a bit different. If you have more than one operating system installed, fixmbr and fixboot could mess up everything. Note that you may also want to run the fixboot command to repair the boot sector with a new one.Īlso, make sure you only use these commands on a system with one operating system installed.
Your damaged MBR will now be replaced with a new master boot record and your computer should now be able to boot properly. Press Enter and then type in the Administrator password.ĥ. Once the Recovery Console loads up, you will have to type in a number that corresponds to your Windows installation. Once the setup loads, you will see the option to press R to repair a Windows installation.Ĥ. If Windows loads automatically, you will first have to enter the BIOS setup and change the order of the boot devices to start with the CD drive.ģ. When prompted, boot from the CD drive by pressing any key.
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