Bootcamp - deleted my mac partition accidently

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Bootcamp - deleted my mac partition accidently

While installing windows onto my mac (which successfully worked) I realised that I had accidently deleted my mac partition and most likely have given the storage to the window's partition. After messing around with some stuff in recovery mode I can no longer load into windows, and whenever I start my computer there is now a folder with a question mark blinking non-stop. Here in recovery mode, I can somehow see all the files and applications I normally had on my macbook before **** hit the fan so I'm guessing I can still fix this without fully installing mac os x again. Oh, and also when I tried installing the mac os x it would not let me and the HD was greyed out. I have no idea how I can use disk utility to fix this so I need help on what to do, and how to get the sudo commands in terminal working so I can post them here to help you guys out.

MacBook Pro with Retina display, iOS 9.2, 2013

Posted on Dec 22, 2015 6:15 AM

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Answer 1

thechoisn1 Author

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Dec 22, 2015 6:17 AM in response to thechoisn1

Also when I tried to repair the partition in disk utility it says 'This disk doesn't contain an EFI system partition...'

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Answer 2

Loner T

Level 9

59,536 points

Dec 22, 2015 9:35 AM in response to thechoisn1

Please install OS X on an external disk and boot from it.

OS X: About OS X Recovery - Apple Support

How to install OS X on an external drive connected to your Mac - Apple Support

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Answer 3

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 2:30 PM in response to Loner T

Doing this now. Thanks for the reply Loner T.

Just wondering though, after I boot my mac by installing OSX onto it, will I still be able to recover my data that is still on my macbook hardrive?

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Answer 4

Loner T

Level 9

59,536 points

Dec 22, 2015 2:38 PM in response to thechoisn1

Please do not touch the internal disk. You want to install OSX on an external disk and boot from it. Depending on what we find, a recovery may be possible.

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Answer 5

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 3:16 PM in response to Loner T

The installation completed and my computer rebooted but now i'm stuck at a 'stop' sign on the grey background with the circle still spinning.

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Answer 6

Loner T

Level 9

59,536 points

Dec 22, 2015 3:25 PM in response to thechoisn1

Shutdown your Mac, power it back up and hold Alt/Option key. The boot disk is still set to internal. Choose the external disk with OSX to boot from.

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Answer 7

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 3:32 PM in response to Loner T

When I do this, only one option is shown - OS X Installer, and when I boot from this, the same problem occurs.

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Answer 8

Loner T

Level 9

59,536 points

Dec 22, 2015 3:41 PM in response to thechoisn1

Are you putting the OSX Installer Application on the external disk, or are you using the Recovery Console to re-install OSX and then choosing your external disk as a destination? The option you see implies the former state.

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Answer 9

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 3:43 PM in response to Loner T

Oh, I have installed OS X from recovery console and chosen the external disk to run from it. If I were to use the other method, how would that be done? thanks

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Answer 10

Loner T

Level 9

59,536 points

Dec 22, 2015 3:49 PM in response to thechoisn1

Your OSX installation does not seem to be complete. Can you run

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

and re-run the installation on the external disk and test booting from it?

What version of OSX are you re-installing?

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Answer 11

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 4:02 PM in response to Loner T

Mavericks. When you say re-run the installation on the external disk and test boot from it, what do you mean? I've reset the smc and nvram already.

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Answer 12

thechoisn1 Author

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1 points

Dec 22, 2015 4:17 PM in response to Loner T

DO you mean that I must basically do what I did before (install os x from recovery console and use my external disk as the destination)?

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Answer 13

Loner T

Level 9

59,536 points

Dec 22, 2015 4:27 PM in response to thechoisn1

1. What was/is the version of OS X on your internal disk?

2. Does Windows boot properly, even if OS X does not?

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Answer 14

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 4:39 PM in response to Loner T

Mavericks, and windows does not boot properly anymore after I messed around with disk utility in recovery console.

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Answer 15

Loner T

Level 9

59,536 points

Dec 22, 2015 5:02 PM in response to thechoisn1

Try to re-install Mavericks on the external disk. If the Mac reboots during the re-installation of Mavericks, hold the Alt/Option key (to avoid the blinking question mark folder issue), and choose the external disk, so Mavericks can complete the installation. Mavericks installation requires a reboot and the first reboot points back to the bad internal disk.

Please report any error you see during this process.

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