Mushfiqullah
Level 1 (0 points)

Q: Erased and Removed bootcamp drive in recovery mode, now prohibition sign appears

I wanted to install Windows 10 on Macbook Pro (Mid 2015) 17", I couldn't wait for boot camp support software do download from boot camp assistant, I downloaded bootcamp 5.1.5769 from apple.com and copied files inside bootable USB containing Windows 10 setup. Doing this, I could install Windows 10 without downloading additional supporting software, but the drivers didn't work properly nor the bootcamp. When running bootcamp setup, i faced with a message "This version of bootcamp is not intended for this computer model". I restarted my computer and removed boot camp drive in recovery mode. Now I can not log in to OS X, it shows prohibit (circle slash) sign. Any Help would be appreciated.

Thanks

MacBook Pro with Retina display, OS X Yosemite (10.10.5)

Posted on Sep 8, 2015 5:11 AM

by Mushfiqullah,Solvedanswer
Mushfiqullah Mushfiqullah
Level 1 (0 points)
A:

Thanks "Loner T" for your advise. I cannot go to safe mode, or I should say any mode. It always displays Circle slash sign I wanted to go to single user mode (Command + S) to run some commands, but still I couldn't.  I also tried Command + V but same problem.

If I press option key (alt key) to select a boot device it shows two drives "Macintosh HD" and "Windows". Although I completely deleted the Bootcamp drive which contained Windows 10. The "Macintosh HD" is automatically resized to its original (4.99 GB). I don't know where that the boat loader gets "Windows" drive from and when I boot from "Windows" I face, as expected, with a blue screen which is of course because it does not find the drive to boot windows. I have an "OS X Yosemite" bootable USB. I tried that to re-install from scratch or to recover my computer to its factory settings without waiting for internet to download but I faced with a message "can't attach image", and I erasing, repairing, unmounting and ejecting disk, but none worked with different messages like "cannot unmount disk" etc.

So what I did I booted my computer from external USB with OS X Yosemite installer using Option(alt) key on startup and instead of installing OS X I went to Terminal and forcefully unmounted all drives:

 

  • First I get all disks list using following command:

diskutil list

  • Second I unmounted each disk
    • Note: I tried "diskutil unmountDisk /dev/disk0" to unmount normally but didn't work. So I inevitably used force unmount

diskutil unmount force /dev/disk0

diskutil unmount force /dev/disk1

...

diskutil unmount force /dev/disk13

 

  • I restarted my mac twice
  • Now my hard drive appeared correctly in Disk Util.
  • That way I can copy my data and reinstall OS X.

Posted on Sep 10, 2015 12:20 PM

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Mushfiqullah

Q: Erased and Removed bootcamp drive in recovery mode, now prohibition sign appears

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  • Helpful answers

  • by Loner T,

    Loner T Loner T Sep 8, 2015 5:14 AM in response to Mushfiqullah
    Level 7 (23,908 points)
    Safari
    Sep 8, 2015 5:14 AM in response to Mushfiqullah

    Can you go back into Recovery Console and boot from Internet Recovery (with the spinning globe using Command+Opt+R)?

  • by Mushfiqullah,

    Mushfiqullah Mushfiqullah Sep 10, 2015 8:19 AM in response to Loner T
    Level 1 (0 points)
    Sep 10, 2015 8:19 AM in response to Loner T

    I did that, but as the internet recovery is too slow, I wanted to know an alternative way. By the way, the internet recovery will erase everything to its factory setting.  I do have everything on my hard drive I just need to repair my disk. I should also mention that the Disk Utility shows my hard disk as "Macintosh HD" while in normal case only the volume should be labelled as "Macintosh HD" and the hard disk itself should be labelled as "500.28 GB APPLE SSD..". When I click on repair disk to repair my hard drive it gives message as "Invalid B-tree node size repair". I cannot repair my disk. I would really appreciate any help.

    Thanks

  • by Loner T,

    Loner T Loner T Sep 10, 2015 9:56 AM in response to Mushfiqullah
    Level 7 (23,908 points)
    Safari
    Sep 10, 2015 9:56 AM in response to Mushfiqullah

    1. Try safe mode if your Mac doesn't finish starting up - Apple Support will try and fix the B-tree errors. It can also be done manually using Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support .

    2. You have a CoreStorage Logical Volume/Volume Group which shows the disks as you describe. If you do not have CS LV/LVG then you will see the Apple SSD style of  display.

    3. How to install OS X on an external drive connected to your Mac - Apple Support can be used to install OSX on an external disk, but it still requires accessing Internet Recovery.

  • by Mushfiqullah,Solvedanswer

    Mushfiqullah Mushfiqullah Sep 10, 2015 12:20 PM in response to Mushfiqullah
    Level 1 (0 points)
    Sep 10, 2015 12:20 PM in response to Mushfiqullah

    Thanks "Loner T" for your advise. I cannot go to safe mode, or I should say any mode. It always displays Circle slash sign I wanted to go to single user mode (Command + S) to run some commands, but still I couldn't.  I also tried Command + V but same problem.

    If I press option key (alt key) to select a boot device it shows two drives "Macintosh HD" and "Windows". Although I completely deleted the Bootcamp drive which contained Windows 10. The "Macintosh HD" is automatically resized to its original (4.99 GB). I don't know where that the boat loader gets "Windows" drive from and when I boot from "Windows" I face, as expected, with a blue screen which is of course because it does not find the drive to boot windows. I have an "OS X Yosemite" bootable USB. I tried that to re-install from scratch or to recover my computer to its factory settings without waiting for internet to download but I faced with a message "can't attach image", and I erasing, repairing, unmounting and ejecting disk, but none worked with different messages like "cannot unmount disk" etc.

    So what I did I booted my computer from external USB with OS X Yosemite installer using Option(alt) key on startup and instead of installing OS X I went to Terminal and forcefully unmounted all drives:

     

    • First I get all disks list using following command:

    diskutil list

    • Second I unmounted each disk
      • Note: I tried "diskutil unmountDisk /dev/disk0" to unmount normally but didn't work. So I inevitably used force unmount

    diskutil unmount force /dev/disk0

    diskutil unmount force /dev/disk1

    ...

    diskutil unmount force /dev/disk13

     

    • I restarted my mac twice
    • Now my hard drive appeared correctly in Disk Util.
    • That way I can copy my data and reinstall OS X.