Level 1

1 points

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

38 replies

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 6:03 PM in response to Loner T

Ugh I tried re-installing and hold alt/option key to choose the external disk when it restarted but it still directs to a grey background with a stop sign.

Does this mean the internal disk is broken?

Loner T

Level 9

59,536 points

Dec 22, 2015 6:12 PM in response to thechoisn1

What type of the external disk are you using? What is the available disk space on this external disk?

The internal disk should be fine, but till we get the external boot working, there is no way to ascertain the state of the internal disk.

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 6:18 PM in response to Loner T

I believe it's a USB 3.0 Hard drive 1tb. Would that be the reason it's not working?

Loner T

Level 9

59,536 points

Dec 22, 2015 6:21 PM in response to thechoisn1

What year/model is your Mac?

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 6:23 PM in response to Loner T

I believe it's a late 2013 macbook pro 13" with retina.

Loner T

Level 9

59,536 points

Dec 22, 2015 6:27 PM in response to thechoisn1

From the back of your Mac, put your Serial number in https://checkcoverage.apple.com/ and check. You do not need to post your serial number.

thechoisn1 Author

Level 1

1 points

Dec 22, 2015 6:30 PM in response to Loner T

CAn confirm the information is correct.

Loner T

Level 9

59,536 points

Dec 22, 2015 6:40 PM in response to thechoisn1

From MacBook Pro (Retina, 13-inch, Late 2013) - Technical Specifications, you haveUSB3 ports. What type of partitioning scheme is used on the disk, what format is it? OS X will not install on Fat/NTFS/MBR disks. They should be formatted as GPT.\\

Before you choose the external disk, in recovery console, run Disk Utility and click on the external disk (the whole disk) and check.

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

Your external drive needs a GUID partition with at least 8 GB of available space to install OS X. For best results, the volume should be formatted as Mac OS X Extended format (not FAT, NTFS, or EXFAT).

Attach a USB, FireWire, or Thunderbolt storage device to your computer, or insert an SDHC or SDXC card into the SD card slot if your Mac has one.

thechoisn1 Author

Level 1

1 points

Dec 23, 2015 4:02 AM in response to Loner T

As Christmas is nearing, I simply do not have time at the moment to work on this. After I gather all the information when I have time I'll let you know but for now, thank you so much for the time and effort you have put in to helping me fix my macbook.

I'll keep you posted.

Thanks.

Loner T

Level 9

59,536 points

Dec 23, 2015 6:56 AM in response to thechoisn1

Post back when you are ready.

thechoisn1 Author

Level 1

1 points

Dec 25, 2015 6:55 PM in response to Loner T

My internal disk format is apparently Logical Partition, and my external disk format is GUID partition table.

There is one more tab in the internal disk section and it says it's an NTFS format so I'm assuming that was for windows?

Thanks.

Loner T

Level 9

59,536 points

Dec 25, 2015 7:12 PM in response to thechoisn1

If you have the internal and external disks connected, can you post the output of

diskutil list

diskutil cs list

You may need to take a photo if you are in Recovery Console.

thechoisn1 Author

Level 1

1 points

Dec 25, 2015 7:34 PM in response to Loner T

Loner T

Level 9

59,536 points

Dec 25, 2015 7:45 PM in response to thechoisn1

You have several different issues.

1. Your EFI partition on the 120GB internal disk is missing.

2. Your have 20GB of space unaccounted for. Can you post a screen shot of gpt -vv -r show /dev/disk0 ?

3. Please try to install OS X on /dev/disk14 (the 1TB disk) and boot from it. If the version you are offered is older than what you had on the internal disk, it is possible to upgrade the external disk to match your last known OS X on the internal disk using the Apple App Store.

thechoisn1 Author

Level 1

1 points

Dec 25, 2015 7:55 PM in response to Loner T

Attempting to re-install OS X on the external disk again.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Bootcamp - deleted my mac partition accidently