6 Replies Latest reply: Nov 3, 2013 8:27 PM by mende1
PeterVoo Level 1 Level 1

I have a macbook 15 inch 2012 mid, i tried Windows bootcamp and decided i didn't really like it. So i turned back to MAC, and in DiskUtil i erased the Bootcamp partitions, and accidently deleted the EFI Partition that had like only 27 mb on it. I didn't think it was notthing but i did some more research on it....


MacBook Pro, MBP91.00D3. Pro Mid 2012, 15 inch.
Solved by mende1 on Nov 3, 2013 1:37 PM Solved

If you haven't backed up your files yet, use Time Machine > http://support.apple.com/kb/HT1427

 

Then, hold Command, Option (Alt) and R keys while your MacBook is starting up to start up into Recovery, and open Disk Utility. Choose your hard drive at the top of the sidebar, go to Erase tab and erase the drive. Finally, close Disk Utility and reinstall OS X

Reply by mende1 on Nov 3, 2013 12:35 PM Helpful

The EFI partition is used to store firmware updates, so they can be installed the next time you start up your Mac.

 

First, to try to recover it, try to repair the partition map. Hold Command and R keys while your Mac is starting up to start up into OS X Recovery, and open Disk Utility. Then, choose your hard drive at the top of the sidebar (the option with the model identifier of the hard drive, not with Macintosh HD) and repair it. The EFI partition should be created again, so try to install the EFI update again.

 

If it doesn't work, you will have to format the whole hard drive and reinstall Mac OS X

Reply by LowLuster on Nov 3, 2013 1:38 PM Helpful

In disk utility from the command+r boot repartition the drive as one partition on the Partition tab.

 

You should not of used Disk Utility to delete the Windows partition. You should of used the Boot Camp Assistant app to remove it. If you had read the boot camp instructions it would of informed you of that.

All replies

  • mende1 Level 10 Level 10
    expertise.desktops
    Desktops

    The EFI partition is used to store firmware updates, so they can be installed the next time you start up your Mac.

     

    First, to try to recover it, try to repair the partition map. Hold Command and R keys while your Mac is starting up to start up into OS X Recovery, and open Disk Utility. Then, choose your hard drive at the top of the sidebar (the option with the model identifier of the hard drive, not with Macintosh HD) and repair it. The EFI partition should be created again, so try to install the EFI update again.

     

    If it doesn't work, you will have to format the whole hard drive and reinstall Mac OS X

  • PeterVoo Level 1 Level 1

    I did the R+Command thingy, and the Disk ulit Repair. It unfortunatly didn't work . The Firmware update still does the same thing. And thanks for the quick reply. But im sorta new with formating Macs. How would i start and go about this reformating process. I Know that i would have to backup my Files and im on that now. Teach me if you please on the steps to do this!

  • mende1 Level 10 Level 10
    expertise.desktops
    Desktops

    If you haven't backed up your files yet, use Time Machine > http://support.apple.com/kb/HT1427

     

    Then, hold Command, Option (Alt) and R keys while your MacBook is starting up to start up into Recovery, and open Disk Utility. Choose your hard drive at the top of the sidebar, go to Erase tab and erase the drive. Finally, close Disk Utility and reinstall OS X

  • LowLuster Level 6 Level 6

    In disk utility from the command+r boot repartition the drive as one partition on the Partition tab.

     

    You should not of used Disk Utility to delete the Windows partition. You should of used the Boot Camp Assistant app to remove it. If you had read the boot camp instructions it would of informed you of that.

  • PeterVoo Level 1 Level 1

    @LowLuster : So if i reformat my Macbook and reinstall OSX, i shouldn't have this problem anymore? and i tried that. it didnt let me remove it from Bootcamp Assistant, the option was somehow greyed out.. Thanks for reply

     

     

    @Mende1 : Thanks I hope my macbook would be just as new after this! and when this is done i would then have all the nessesary file to run updates and what not properly? Crazy how one little mistake could be sooooooo deverstating.

  • mende1 Level 10 Level 10
    expertise.desktops
    Desktops

    Correct. You should be able to install all updates