Restore the master book record

Hello

I have a MacBook Pro and installed windows via bootcamp 10. Now, I wanted to created a partition which can be read/written by windows and mac software. I created a partition in the format exfat under OS X. I couldn't write on this partition under windows, so I wanted to delete the partition exfat and create a new Windows.

It seems that I deleted the wrong partition, because only 10 windows then begins. If I press the CMD key during startup, only 10 of Windows appears. I suppose that the Master Boot Record does not work. Is it possible to repair the master boot record?

My time Machine backup seems to be corrupted too and does not work.

Thanks for the help!

Note that if you use Boot Camp Assistant to create your Windows partition, you cannot create additional partitions. You can have the OS X and Windows partition. Create a third partition causes the transition from Windows to be of any use.

According to the current state, you must start the computer in the HD Recovery, disk utility open partition all the drive back to a single partition, then reinstall a new copy of Mac OS X.

Install or reinstall OS X from scratch

Make sure that you have backed up your files because the following procedure will remove all of the hard drive.

HD recovery start:

Restart the computer and after the buzzer, press on and hold down the COMMAND and R until the menu screen appears.

Erase the drive:

1. select in the main menu disk utility and click on the continue button.

2. once the charges of THE select your boot volume (usually Macintosh HD) in the

list on the left. Click on the Erase tab in the main window of THE.

3. set the type of format Mac OS extended (journaled). If necessary, click

Security and button all the option data from scratch in a single pass. Click

the clear button and wait until the process is complete.

4 leave FROM and return to the main menu.

Reinstall OS X: Select reinstall OS X and click on the install button.

Note : You will need an active Internet connection. I suggest to use Ethernet if possible

because it is three times faster than wireless.

This should install the version of Mac OS X that you had installed it.

Tags: Windows Software

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