Apple Event: May 7th at 7 am PT

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Level 1

8 points

Mac drive no longer showing up as boot option?

MacBook pro 2015. Have bootcamp, mac osx el capitan one side, windows 10 the other. Wanted to make the windows 10 one bigger, used disk utility to shrink mac osx partition. This named the unallocated space 'untitled' wouldn't let me make bootcamp partition bigger. So I switched to windows and tried using Ease US partition master, wouldn't let me resize bootcamp partition either. So (using ease us) deleted 'untitled partition' that was created when I shrunk the mac osx one on mac disk utitlity. Still wouldn't let me resize bootcamp partition. So I created a small partition as NTFS over the now unallocated space, so I could use it for more storage on windows 10. Now when I start the PC no boot option available only Windows 10. Boot camp still running in windows, and I tried clicking restart into Mac OSX, black screen for 10 seconds then boots into windows. Pressing alt when turning on works, but again only windows disk is displayed. I didn't damgage the OSX partition, all I did was make it slightly smaller, (it had a lot of free space). What do I do?

MacBook Pro, OS X El Capitan (10.11)

Posted on Oct 11, 2015 12:07 PM

26 replies

bensparkes98 Author

Level 1

8 points

Oct 16, 2015 6:07 AM in response to Loner T

Nope neither. Recovery gets me into recovery, but all it offers is for me to change my password. Mac won't boot into safe mode it just does its own thing and boots to the normal login screen.

Loner T

Level 9

59,471 points

Oct 16, 2015 7:17 AM in response to bensparkes98

If you cannot get to Local Recovery, does Internet Recovery (Command+Opt+R) work?

bensparkes98 Author

Level 1

8 points

Oct 16, 2015 1:13 PM in response to Loner T

What key is the 'opt' key?

Loner T

Level 9

59,471 points

Oct 16, 2015 2:07 PM in response to bensparkes98

bensparkes98 Author

Level 1

8 points

Oct 23, 2015 11:22 AM in response to Loner T

I've now managed to get into internet recovery and blank the disk. I have an empty partition named untitled formatted to Mac OSX extended (journaled). I have a dmg file for Yosemite on a memory stick. I'm using the restore function to fix the disk. It reads the dmg fine, then says before it can begin restoring it has to scan the partition I'm 'restoring' in this case 'Untitled' but then I just get the message seen in the picture 😟

Loner T

Level 9

59,471 points

Oct 23, 2015 11:57 AM in response to bensparkes98

What is in the DMG? Yosemite Installer, or your OSX Yosemite backup? Also, notice your Untitled is mounted.

bensparkes98 Author

Level 1

8 points

Oct 24, 2015 3:06 AM in response to Loner T

DMG is a fresh installer for Yosemite. It doesn't seem to have a problem with the DMG. I dismounted Untitled to see if that would work but it didn't. Mounted or unmounted it still claims its in use. Same as if I try doing it straight to the hard drive (well, SDD) by selecting the 500.28GB APPLE SSD, again it cames up with the same error when it comes to disk scanning.

Loner T

Level 9

59,471 points

Oct 24, 2015 7:30 AM in response to bensparkes98

bensparkes98 wrote:

DMG is a fresh installer for Yosemite.

If it is an installer, and the internal disk has no OS, boot from the Yosemite USB Installer using Alt/Option, and since you have already wiped the internal disk, install a new copy of OS X.

Dec 25, 2015 8:02 PM in response to bensparkes98

So I did something very similar, except that I did not shrink my mac partition. All I did was add the unallocated space to the left of my windows side to the windows C drive using EaseUS. Is there anyway to recover my mac side?

Loner T

Level 9

59,471 points

Dec 26, 2015 6:53 AM in response to andy.w.garcia

andy.w.garcia wrote:

So I did something very similar, except that I did not shrink my mac partition. All I did was add the unallocated space to the left of my windows side to the windows C drive using EaseUS. Is there anyway to recover my mac side?

Can you start a new discussion to avoid confusion with OP? Please post the output of the following commands in the new discussion.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

Dec 26, 2015 1:08 PM in response to bensparkes98

I ended up just reinstalling the operating system. But thank you for the help!

Mac drive no longer showing up as boot option?