mtaylor1326

Q: Can't boot back into OS X. Partition appears to still be there, but does not show up on PC

Hello everyone,

 

I've been searching all over the place for fixes of this problem, but I can't seem to find anything that will work.

 

Yesterday I decided to set up Boot Camp again after I lost it when my computer needed repairs last year. I installed Windows 7 through Boot Camp with no complications (other than the partition initially failing to be created, which I was able to solve) and then upgraded to Windows 10. Everything seemed to be running as expected, but when I went to boot into OS X from the Boot Camp icon in the system tray, my computer simply restarted back into Windows. When I restarted to computer again and pressed alt/option to bring up the startup disks, only the Windows disk showed.

 

So, I booted my computer into Recovery mode (Internet Recovery mode started up--I read on Apple's site, that this would happen if no OS is installed?) and checked Disk Utility to make sure I hadn't lost all of my files. My Mac partition still seemed to be there and with all files intact. I repaired the disk just to be safe, exited out of Recovery mode and selected OS X as the startup disk, but it still started right back up into Windows. At this point I figured maybe something had happened to OS X or it had gotten deleted somehow, so I went back into Internet Recovery and tried to reinstall OS X, but was unable to (I believe it said the disk couldn't be verified, but I can't remember for sure).

 

But now the part that has me baffled the most. I ran diskutil list in Terminal, and it listed 13 disks, with Macintosh HD as the last one. Most of the disks were small, only a few megabytes or so, but I have no idea where they came from or what they are.

 

I'm at a complete loss at this point. Any help is greatly appreciated.

Thank you.

MacBook Pro (13-inch Mid 2012), OS X El Capitan (10.11.1)

Posted on Nov 7, 2015 4:44 PM

Close

Q: Can't boot back into OS X. Partition appears to still be there, but does not show up on PC

  • All replies
  • Helpful answers

Previous Page 2 of 3 last Next
  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 8, 2015 7:09 PM in response to Loner T
    Level 1 (0 points)
    Nov 8, 2015 7:09 PM in response to Loner T

    I tried resetting them again, but still nothing has changed. Have we exhausted all of our options?

  • by Loner T,

    Loner T Loner T Nov 9, 2015 4:37 AM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 9, 2015 4:37 AM in response to mtaylor1326

    Also, if you have Control Panel -> System -> Boot Camp, you can select OS X from it and reboot into OS X. This requires that you have Bootcamp drivers already installed and working.

     

    Please also see Boot Camp: Set the default operating system .

    Did you check this option? Do you have a Bootcamp icon in Control Panel -> System?

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 9, 2015 9:49 AM in response to Loner T
    Level 1 (0 points)
    Nov 9, 2015 9:49 AM in response to Loner T

    Yes, I have tried that as well, but it still just restarts in Windows.

  • by Loner T,

    Loner T Loner T Nov 9, 2015 10:37 AM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 9, 2015 10:37 AM in response to mtaylor1326

    If you shut down your Mac, power it back up and hold Command+Opt+R, do you get a Recovery console? Your EFI partition may no longer have the proper EFI for OSX to boot.

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 9, 2015 10:50 AM in response to Loner T
    Level 1 (0 points)
    Nov 9, 2015 10:50 AM in response to Loner T

    I do get Internet Recovery. I had used it previously to verify that my files were still on my Mac HD and to run diskutil list in Terminal.

  • by Loner T,

    Loner T Loner T Nov 9, 2015 11:09 AM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 9, 2015 11:09 AM in response to mtaylor1326

    Do you have El Capitan or an older OSX version?

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 9, 2015 11:18 AM in response to Loner T
    Level 1 (0 points)
    Nov 9, 2015 11:18 AM in response to Loner T

    I have El Capitan.

  • by Loner T,

    Loner T Loner T Nov 9, 2015 11:24 AM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 9, 2015 11:24 AM in response to mtaylor1326

    Can you check if your internal disk's EFI partition has an Apple directory?

     

    Can you run a diskutil verifyVolume on disk0s2? your GPT indicates that it is a CS volume (AF05), which means disk0s2 may the underlying physical volume and there is alogical volume. If diskutil cs list returns a CS volume, run diskutil verifyVolume on the disk which shows up as the logical volume disk.

     

    The disk numbering changes in Recovery console from the normal naming.

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 9, 2015 12:18 PM in response to Loner T
    Level 1 (0 points)
    Nov 9, 2015 12:18 PM in response to Loner T

     

    Can you check if your internal disk's EFI partition has an Apple directory?

     

    How would I go about doing this?

     

    In Recovery mode, I did run verifyVolume on disk0s2 (which did come up as the Logical Volume when I ran diskutil cs list) and it said that it appeared to be okay.

     

    Also, I ran diskutil list again. I don't know if it's useful, but I figured it couldn't hurt to post the output here:

     

    diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *500.1 GB   disk0

       1:                        EFI                         209.7 MB   disk0s1

       2:          Apple_CoreStorage                         299.2 GB   disk0s2

       3:                 Apple_Boot Boot OS X               650.0 MB   disk0s3

       4:       Microsoft Basic Data BOOTCAMP                200.0 GB   disk0s4

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     Apple_partition_scheme                        *1.2 GB     disk1

       1:        Apple_partition_map                         30.7 KB    disk1s1

       2:                  Apple_HFS Mac OS X Base System    1.2 GB     disk1s2

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk2

    /dev/disk3

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk3

    /dev/disk4

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk4

    /dev/disk5

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk5

    /dev/disk6

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk6

    /dev/disk7

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *6.3 MB     disk7

    /dev/disk8

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *2.1 MB     disk8

    /dev/disk9

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *1.0 MB     disk9

    /dev/disk10

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk10

    /dev/disk11

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk11

    /dev/disk12

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *1.0 MB     disk12

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 9, 2015 12:42 PM in response to mtaylor1326
    Level 1 (0 points)
    Nov 9, 2015 12:42 PM in response to mtaylor1326

    Oh wait, Macintosh HD was locked. Here it is instead:

     

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *500.1 GB   disk0

       1:                        EFI                         209.7 MB   disk0s1

       2:          Apple_CoreStorage                         299.2 GB   disk0s2

       3:                 Apple_Boot Boot OS X               650.0 MB   disk0s3

       4:       Microsoft Basic Data BOOTCAMP                200.0 GB   disk0s4

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     Apple_partition_scheme                        *1.2 GB     disk1

       1:        Apple_partition_map                         30.7 KB    disk1s1

       2:                  Apple_HFS Mac OS X Base System    1.2 GB     disk1s2

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk2

    /dev/disk3

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk3

    /dev/disk4

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk4

    /dev/disk5

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk5

    /dev/disk6

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk6

    /dev/disk7

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *6.3 MB     disk7

    /dev/disk8

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *2.1 MB     disk8

    /dev/disk9

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *1.0 MB     disk9

    /dev/disk10

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk10

    /dev/disk11

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *524.3 KB   disk11

    /dev/disk12

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                            untitled               *1.0 MB     disk12

    /dev/disk13

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS Macintosh HD           *298.9 GB   disk13

  • by Loner T,

    Loner T Loner T Nov 9, 2015 2:34 PM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 9, 2015 2:34 PM in response to mtaylor1326

    disk0 and disk1 are the physical disk and LV. They look fine. What is is disk13?

     

    Look at page 3 of Can't resize Macintosh HD partition and see the commands used to mount disk0s1. Since you are already root in Recovery, you will not need the "sudo" before the commands.

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 9, 2015 7:39 PM in response to Loner T
    Level 1 (0 points)
    Nov 9, 2015 7:39 PM in response to Loner T

    I'm pretty sure disk13 is Macintosh HD; it's the same size as my Mac partition would be.

     

    Also, I just want to make sure, so I'm not doing anything incorrectly. To mount disk0s1, would I use all of the following commands, or just some/one of them:

     

    sudo mkdir -p /Volumes/EFI

    sudo mount -t msdos /dev/disk0s1 /Volumes/EFI

    ls -lR /Volumes/EFI

     

    EDIT: Nevermind, I only use the second one, but without the /Volumes/EFI stuff, is that correct?

  • by Loner T,

    Loner T Loner T Nov 9, 2015 8:11 PM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 9, 2015 8:11 PM in response to mtaylor1326

    You may want to mount the EFI volume readonly with -o rdonly .

  • by mtaylor1326,

    mtaylor1326 mtaylor1326 Nov 22, 2015 8:56 AM in response to Loner T
    Level 1 (0 points)
    Nov 22, 2015 8:56 AM in response to Loner T

    Apologies for the long gap between posts. I hadn't had much time to look into things recently.

     

    Anyway, what should I do after I've mounted the EFI?

  • by Loner T,

    Loner T Loner T Nov 22, 2015 11:29 AM in response to mtaylor1326
    Level 7 (24,611 points)
    Safari
    Nov 22, 2015 11:29 AM in response to mtaylor1326

    Check is there is an Apple directory in that partition?

Previous Page 2 of 3 last Next