My external Windows HD (Thunderbolt-connected) is no longer bootable after I migrated my OS X El Capitan to a new iMac. The Windows HD mounts OK in OS X and I can read data from it, but it does not show as a boot option when restarting with Alp-Option; it can also not be chosen as Startup Disk in System Preferences, although it is shown there. It appears that the EFI System Partition has been lost on my Windows HD.

I’ve tried to repair this HD with “diskutil repairDisk”, but this didn’t work.

How can I restore that EFI System Partition?

Partial output from “diskutil list”:

/dev/disk5 (external, physical):

   #:                       TYPE NAME            SIZE        IDENTIFIER

   0:      GUID_partition_scheme                *3.0 TB      disk6

   1:       Microsoft Basic Data WINDOWS         3.0 TB      disk6s1

   2:           Windows Recovery                 471.9 MB    disk6s2

Output from “sudo gpt -vv -r show /dev/disk5″:

gpt show: /dev/disk6: mediasize=3000592982016; sectorsize=512; blocks=5860533168

gpt show: /dev/disk6: PMBR at sector 0

gpt show: /dev/disk6: Pri GPT at sector 1

gpt show: /dev/disk6: Sec GPT at sector 5860533167

       start        size  index  contents

           0           1         PMBR

           1           1         Pri GPT header

           2          32         Pri GPT table

          34        2014

        2048  5859608576      1  GPT part – EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  5859610624      921600      2  GPT part – DE94BBA4-06D1-4D40-A16A-BFD50179D6AC

  5860532224         911

  5860533135          32         Sec GPT table

  5860533167           1         Sec GPT header

Output from “sudo fdisk /dev/disk5″:

Disk: /dev/disk5  geometry: 97451/255/63 [1565565872 sectors]

Signatu 0xAA55

         Starting       Ending

#: id  cyl  hd sec –  cyl  hd sec [     start –       size]

————————————————————————

1: EE    0   0   2 – 1023 255  63 [         1 – 4294967295] <Unknown ID>

2: 00    0   0   0 –    0   0   0 [         0 –          0] unused

3: 00    0   0   0 –    0   0   0 [         0 –          0] unused

4: 00    0   0   0 –    0   0   0 [         0 –          0] unused

Output from “sudo dd if=/dev/rdisk5s1 count=1 2>/dev/null |hexdump -C”:

00000000  eb 52 90 4e 54 46 53 20  20 20 20 00 02 08 00 00  |.R.NTFS    …..|

00000010  00 00 00 00 00 f8 00 00  3f 00 ff 00 00 08 00 00  |……..?…….|

00000020  00 00 00 00 80 00 80 00  ff 87 42 5d 01 00 00 00  |……….B]….|

00000030  00 00 0c 00 00 00 00 00  02 00 00 00 00 00 00 00  |…………….|

00000040  f6 00 00 00 01 00 00 00  c9 b4 93 3c db 93 3c d6  |………..<..<.|

00000050  00 00 00 00 fa 33 c0 8e  d0 bc 00 7c fb 68 c0 07  |…..3…..|.h..|

00000060  1f 1e 68 66 00 cb 88 16  0e 00 66 81 3e 03 00 4e  |..hf……f.>..N|

00000070  54 46 53 75 15 b4 41 bb  aa 55 cd 13 72 0c 81 fb  |TFSu..A..U..r…|

00000080  55 aa 75 06 f7 c1 01 00  75 03 e9 dd 00 1e 83 ec  |U.u…..u…….|

00000090  18 68 1a 00 b4 48 8a 16  0e 00 8b f4 16 1f cd 13  |.h…H……….|

000000a0  9f 83 c4 18 9e 58 1f 72  e1 3b 06 0b 00 75 db a3  |…..X.r.;…u..|

000000b0  0f 00 c1 2e 0f 00 04 1e  5a 33 db b9 00 20 2b c8  |……..Z3… +.|

000000c0  66 ff 06 11 00 03 16 0f  00 8e c2 ff 06 16 00 e8  |f……………|

000000d0  4b 00 2b c8 77 ef b8 00  bb cd 1a 66 23 c0 75 2d  |K.+.w……f#.u-|

000000e0  66 81 fb 54 43 50 41 75  24 81 f9 02 01 72 1e 16  |f..TCPAu$….r..|

000000f0  68 07 bb 16 68 52 11 16  68 09 00 66 53 66 53 66  |h…hR..h..fSfSf|

00000100  55 16 16 16 68 b8 01 66  61 0e 07 cd 1a 33 c0 bf  |U…h..fa….3..|

00000110  0a 13 b9 f6 0c fc f3 aa  e9 fe 01 90 90 66 60 1e  |………….f`.|

00000120  06 66 a1 11 00 66 03 06  1c 00 1e 66 68 00 00 00  |.f…f…..fh…|

00000130  00 66 50 06 53 68 01 00  68 10 00 b4 42 8a 16 0e  |.fP.Sh..h…B…|

00000140  00 16 1f 8b f4 cd 13 66  59 5b 5a 66 59 66 59 1f  |…….fY[ZfYfY.|

00000150  0f 82 16 00 66 ff 06 11  00 03 16 0f 00 8e c2 ff  |….f………..|

00000160  0e 16 00 75 bc 07 1f 66  61 c3 a1 f6 01 e8 09 00  |…u…fa…….|

00000170  a1 fa 01 e8 03 00 f4 eb  fd 8b f0 ac 3c 00 74 09  |…………<.t.|

00000180  b4 0e bb 07 00 cd 10 eb  f2 c3 0d 0a 41 20 64 69  |…………A di|

00000190  73 6b 20 72 65 61 64 20  65 72 72 6f 72 20 6f 63  |sk read error oc|

000001a0  63 75 72 72 65 64 00 0d  0a 42 4f 4f 54 4d 47 52  |curred…BOOTMGR|

000001b0  20 69 73 20 63 6f 6d 70  72 65 73 73 65 64 00 0d  | is compressed..|

000001c0  0a 50 72 65 73 73 20 43  74 72 6c 2b 41 6c 74 2b  |.Press Ctrl+Alt+|

000001d0  44 65 6c 20 74 6f 20 72  65 73 74 61 72 74 0d 0a  |Del to restart..|

000001e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |…………….|

000001f0  00 00 00 00 00 00 8a 01  a7 01 bf 01 00 00 55 aa  |…………..U.|

00000200

Output from “sudo diskutil verifyDisk disk5″:

Started partition map verification on disk5

Checking prerequisites

Checking the partition list

Checking the partition map size

Checking for an EFI system partition

Problems were found with the partition map which might prevent booting

Error: -69767: This disk doesn’t contain an EFI system partition; if you

want to start up your computer with this disk or include it in a RAID

set, back up your data and partition this disk

Output from “sudo diskutil repairDisk disk5″

Repairing the partition map might erase disk5s1, proceed? (y/N) y

Started partition map repair on disk5

Checking prerequisites

Checking the partition list

Adjusting partition map to fit whole disk as required

Checking for an EFI system partition

Problems were encountered during repair of the partition map

Error: -69767: This disk doesn’t contain an EFI system partition; if you

want to start up your computer with this disk or include it in a RAID

set, back up your data and partition this disk

Hi guys,

After attempting to run Windows 10 off my MacBook Pro through Bootcamp, I encountered an error in the Windows Setup phase that said it couldn’t create/locate a partition, so on the advice of a friend, I started the process over.

However, when attempting to run Bootcamp again, I now can’t because my Disk Drive has been partitioned and I’m struggling to merge it back into one Mac OS X Journaled drive. I have a Basic Data Partition which I can only guess is the 80gb Windows partition I created in my first attempt (even though it says Mac OS X Journaled in Disk Utility), but now I can’t even get back to just a single partition and start Bootcamp. The  minus is greyed out on every partition except for one of the smaller segments you see in the screenshots, but even then it says operation failed if I try to apply even that. (The MS-DOS and Seagate folders on the right of the screenshots are an external HDD).

Please help! Thanks in advance,

Tom

I have Windows 8.1 Pro (in a Boot Camp partition) installed on my MacBook Pro Retina Mid 2014.  When running the Windows 10 Pro upgrade, I get an error:

0xC1900101 – 0x2000C

The installation failed in the SAFE_OS phase with an error during APPLY_IMAGE operation.

I have an SSD and I suspect there’s something going on here with the boot mode.  What am I missing?  I think I remember having to do something special to get Windows 8.1 installed but I don’t recall what that was …

I have just replaced the hardrive in my 2010 27″  i7 iMac. I need it to triple boot into Yosemite, Mountain Lion and Windows. Yosemite because it is almost current and Mountain Lion because all my hardware still works under Mountain Lion, And Windows because I use it for playing games, and the odd program I can’t get for Mac. I also have a data partition.

This has left me with 6 partitions on my disk. And Bootcamp not showing up as an option to boot from.

Is anything I can do to make my scheme work correctly?

Here is a dikutil list

diskutil list /dev/disk0

   #:                       TYPE NAME                              SIZE            IDENTIFIER

   0:      GUID_partition_scheme                             *4.0 TB          disk0

   1:                        EFI EFI                                    209.7 MB        disk0s1

   2:                  Apple_HFS Mountain Lion            599.5 GB        disk0s2

   3:                 Apple_Boot Recovery HD              650.0 MB        disk0s3

   4:                  Apple_HFS Yosemite                     600.0 GB        disk0s4

   5:                  Apple_HFS Data                            2.3 TB            disk0s5

   6:       Microsoft Basic Data BOOTCAMP           488.9 GB        disk0s6

My 2011 Macbook Pro 17″ has a similar triple boot set up but without the data partition and works flawlessly.

Any help would be gratefully recieved

Piers

Hi, I am a Mac user (2015 MacBook Pro) who has already used Boot Camp to make a windows partition. Some weird things were happening with programs on my windows partition, so I tried using the recovery tool. Unfortunately, this deleted all the drivers for the partition. My main question is whether it’s possible to install those drivers on the existing partition without having to re-partition everything. I have found the support software and installed the drivers, but they don’t seem to be having any effect on my usage. Any help would be greatly appreciated.

I’m setting up a brand new Late 2015 iMac 27 5K with a 512GB Flash Drive but I’m having issues installing Windows 10 to Bootcamp.

It’s a clean install of OS 10.11.1 and as such Bootcamp assistant doesn’t require an external USB drive for the windows files.

The assistant starts, allows me to create a 100GB partition and automatically finds my Win10 ISO but after downloading the Windows support files, rebooting and the Windows installer kicking in I reach the part where I choose the partition to install into. I can select the BOOTCAMP partition which is initially unable to install windows and Format it and then the BOOTCAMP label disappears. I then select the newly formatted partition and click next but then after a couple of seconds pause it reports: ‘We couldn’t create a new partition or locate an existing one’

The only option I then have is to quit the installer which reboots me back into El Capitan. Running the Bootcamp installer only gives me the option to delete the Mac drive back into a single volume. I’ve been googling and others have had similar issues but most are referring to the old way of installing Bootcamp using an external USB drive. I don’t have that option with El Capitan !

Can’t see any way past this ! Help !

Loner T – Thank you for your help. Here is what you requested:

Last login: Tue Nov 17 18:22:06 on console

Eoins-MacBook-Pro:~ mynameiseoin$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage Macintosh HD            499.4 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1 (internal, virtual):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           +400.0 GB   disk1

                                 Logical Volume on disk0s2

                                 FBD7F4EE-0C28-4B79-A86A-850566687098

                                 Unencrypted

Eoins-MacBook-Pro:~ mynameiseoin$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+– Logical Volume Group 74261078-D8B3-4D44-95E7-8469F64396CC

    =========================================================

    Name:         Macintosh HD

    Status:       Online

    Size:         499418034176 B (499.4 GB)

    Free Space:   99065819136 B (99.1 GB)

    |

    +-< Physical Volume A3938A9D-877C-4358-80F0-6D23389C49C8

    |   —————————————————-

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     499418034176 B (499.4 GB)

    |

    +-> Logical Volume Family BA28455B-5276-4582-ABD1-628056527978

        ———————————————————-

        Encryption Type:         AES-XTS

        Encryption Status:       Unlocked

        Conversion Status:       Converting (backward)

        Reversion State:         Reverting

        High Level Queries:      Not Fully Secure

        |                        Has Visible Users

        |                        Has Volume Key

        |

        +-> Logical Volume FBD7F4EE-0C28-4B79-A86A-850566687098

            —————————————————

            Disk:                  disk1

            Status:                Online

            Size (Total):          399999893504 B (400.0 GB)

            Conversion Progress:   87%

            Revertible:            Yes (unlock and decryption required)

            LV Name:               Macintosh HD

            Volume Name:           Macintosh HD

            Content Hint:          Apple_HFS

Eoins-MacBook-Pro:~ mynameiseoin$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=500277790720; sectorsize=512; blocks=977105060

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 977105059

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part – C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  975425848      2  GPT part – 53746F72-6167-11AA-AA11-00306543ECAC

  975835488    1269536      3  GPT part – 426F6F74-0000-11AA-AA11-00306543ECAC

  977105024          3        

  977105027         32         Sec GPT table

  977105059          1         Sec GPT header

Eoins-MacBook-Pro:~ mynameiseoin$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 60821/255/63 [977105060 sectors]

Signatu 0xAA55

         Starting       Ending

#: id  cyl  hd sec –  cyl  hd sec [     start –       size]

————————————————————————

1: EE 1023 254  63 – 1023 254  63 [         1 –  977105059] <Unknown ID>

2: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

3: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

4: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

Eoins-MacBook-Pro:~ mynameiseoin$

I cannot remove the Windows 10 Bootcamp partition I have set up. I get this message..

Also the last option to remove the partition has been grayed out. Can someone help?

Looks like a common theme here, but my windows partition is not bootable after El Capitan installation. After I attempted the upgrade thru the AppStore, the computer restarted and I was left with a circle with a slash, there was no bootable devices found, it took a full recovery and I lost data on the OSX drive. Hopefully I haven’t also lost everything on my windows partition. Can someone help me get this back working.

Heres the output of the first step from this thread: Bootcamp partition missing after yosemite installation

Theos-MacBook-Pro:~ Theo$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *256.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS OSX                     169.3 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data BOOTCAMP                85.2 GB    disk0s4

/dev/disk1 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +51.2 MB    disk1

Theos-MacBook-Pro:~ Theo$ diskutil cs list

No CoreStorage logical volume groups found

Theos-MacBook-Pro:~ Theo$ sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=256060514304; sectorsize=512; blocks=500118192

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 500118191

      start       size  index  contents

          0          1         MBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part – C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  330761712      2  GPT part – 48465300-0000-11AA-AA11-00306543ECAC

  331171352    1269536      3  GPT part – 426F6F74-0000-11AA-AA11-00306543ECAC

  332440888    1270472        

  333711360  166406144      4  GPT part – EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  500117504        655        

  500118159         32         Sec GPT table

  500118191          1         Sec GPT header

Theos-MacBook-Pro:~ Theo$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 31130/255/63 [500118192 sectors]

Signatu 0xAA55

         Starting       Ending

#: id  cyl  hd sec –  cyl  hd sec [     start –       size]

————————————————————————

1: EE 1023 254  63 – 1023 254  63 [         1 –     409639] <Unknown ID>

2: AF 1023 254  63 – 1023 254  63 [    409640 –  330761712] HFS+       

3: AB 1023 254  63 – 1023 254  63 [ 331171352 –    1269536] Darwin Boot

4: 0C 1023 254  63 – 1023 254  63 [ 333711360 –  166406144] Win95 FAT32L

Theos-MacBook-Pro:~ Theo$

Hello everyone, I know this has been asked before but I think I have a unique problem when I’m trying to fix this through terminal

Here is what I have so far

esus-MacBook-Pro:~ windows2$ sudo gpt -r -vv show disk0

Password:

gpt show: disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: disk0: PMBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 976773167

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part – C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  801272944      2  GPT part – 48465300-0000-11AA-AA11-00306543ECAC

  801682584    1269536      3  GPT part – 426F6F74-0000-11AA-AA11-00306543ECAC

  802952120   56372296      4  GPT part – 48465300-0000-11AA-AA11-00306543ECAC

  859324416     262144        

  859586560  117186560      5  GPT part – EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  976773120         15        

  976773135         32         Sec GPT table

  976773167          1         Sec GPT header

Jesus-MacBook-Pro:~ windows2$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 60801/255/63 [976773168 sectors]

Signatu 0xAA55

         Starting       Ending

#: id  cyl  hd sec –  cyl  hd sec [     start –       size]

————————————————————————

1: EE 1023 254  63 – 1023 254  63 [         1 –  976773167] <Unknown ID>

2: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

3: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

4: 00    0   0   0 –    0   0   0 [         0 –          0] unused

When I use the sudo gdisk /dev/disk0 I get an error message

sudo: /dev/disk0: command not found

Any help would be great. I was originally trying to make my Windows Partition larger but since it disappeared I wasn’t able to return to Windows to complete the resize after I made a new “hard drive” with the extra GB I wanted to add to windows

Hey,

i wanted to install Windows 8.1 but had a problem with installation via usb. It asked me to format The partition to get a correct extintion.

my mistake was.. In windows’s terminal i used clean command and got rid of every partition. It took like 1 second so i guess i didnt format disk totally but just The table (or how its called). I went to The Apple Devices service in my town and After few days they called me and said they run few different softwares but they cant recover nothing.

maybe Here someone will know any solution?

macbook 13″ no retina if it matters.

thank you

ps. Exactly same problem had a guy from discussion below

Restoring accidentally cleaned Boot Camp partition/hard drive

Hi people in this lovely community

I have encountered a big problem when I upgraded my OS X to El Capitan.

As you probably guessed, My Bootcamp were gone after the update.

I read some of the Q&A from other posts and managed to see my Windows on start up screen. (pressing alt key). Doesn’t appear on my Finder or unable to mount the partition.

I see a lot of question relating to this and people are probably tired of this “problem” but I have some important files in my corrupted bootcamp.

MacBook Pro (13-inch, Mid 2012)

El Capitan (Main OSX) : 10.11.1

Bootcamp : Windows 10

2TB External HDD

Yosemite (Ext HDD) : 10.10.3

This is what I got so far. I am currently booting my Yosemite from an external HDD. (/dev/disk2)

sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

sudo fdisk /dev/disk0

and

sudo gpt -vv -r show /dev/disk0

Using testdisk (I could just copy my important files to my hard disk and clean install Bootcamp, But I feel like I’m one step away from solving this problem )

Now this is how far I got from other posts and I see a lot of people attempting “Rebuilding MBR“? and I don’t want to screw this up. I feel like this is the last key.

I’m scared of failing this so anyone who can help me, that would be great!

Thank you

how do I increase the size of my Mac Partition?

On my MacBook Pro I have upgraded Windows-7 Ultimate to Windows 10 Pro. Bootcamp was working fine for the Win-7 OS with keyboard control of volume and luminance settings for screen and keyboard backlight. Now with Win-10 it appears the drivers for the Mac keyboard no longer work. How can I upgrade the drivers for Bootcamp with Win-10. This is older MacBook Pro (17 inch monitor circa 2007) and Mac OSX-10.5.6?

hello everyone

is it possible to set up a seconded readable drive for bootcamp? i have windows 7 professional and need to install drivers.. i tried partitioning my external hard drive but that don’t seem to work..

I’m running el capitan on mid 2010 mbp 15″ intel 2.66 ghz i7 – 4 gb 1067 mhz ddr3

help, anyone?

I’m using 10.11.2 and noticed today that the bootcamp partition is missing.  I use it only occasionally; so I’m not sure what upgrade broke it.  In any event, I found some earlier discussions, and I’m posting the outputs LonerT requests.

Johns-MacBook-Pro-2:~ jdb$ diskutil list

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage Macintosh HD            424.4 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data BOOTCAMP                74.6 GB    disk0s4

   5:           Windows Recovery                         471.9 MB   disk0s5

/dev/disk1 (internal, virtual):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           +424.0 GB   disk1

                                 Logical Volume on disk0s2

                                 4EB43828-6D41-41A6-8723-C28318F4BCB5

                                 Unencrypted

CoreStorage logical volume groups (1 found)

|

+– Logical Volume Group C0F4BC91-58CC-4706-A67C-54708BB15C41

    =========================================================

    Name:         Macintosh HD

    Status:       Online

    Size:         424371220480 B (424.4 GB)

    Free Space:   18903040 B (18.9 MB)

    |

    +-< Physical Volume 974C10EF-FC2E-4D40-B441-D881740F3E51

    |   —————————————————-

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     424371220480 B (424.4 GB)

    |

    +-> Logical Volume Family EAD55B34-DD91-41CC-B092-C33B1154523F

        ———————————————————-

        Encryption Type:         None

        |

        +-> Logical Volume 4EB43828-6D41-41A6-8723-C28318F4BCB5

            —————————————————

            Disk:                  disk1

            Status:                Online

            Size (Total):          423999995904 B (424.0 GB)

            Revertible:            Yes (no decryption required)

            LV Name:               Macintosh HD

            Volume Name:           Macintosh HD

            Content Hint:          Apple_HFS

Johns-MacBook-Pro-2:~ jdb$ sudo gpt -vv -r show /dev/disk0

Password:

Sorry, try again.

Password:

gpt show: /dev/disk0: mediasize=500277790720; sectorsize=512; blocks=977105060

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 977105059

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part – C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  828850040      2  GPT part – 53746F72-6167-11AA-AA11-00306543ECAC

  829259680    1269536      3  GPT part – 426F6F74-0000-11AA-AA11-00306543ECAC

  830529216        320        

  830529536  145653760      4  GPT part – EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  976183296     921600      5  GPT part – DE94BBA4-06D1-4D40-A16A-BFD50179D6AC

  977104896        131        

  977105027         32         Sec GPT table

  977105059          1         Sec GPT header

Johns-MacBook-Pro-2:~ jdb$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 60821/255/63 [977105060 sectors]

Signatu 0xAA55

         Starting       Ending

#: id  cyl  hd sec –  cyl  hd sec [     start –       size]

————————————————————————

1: EE 1023 254  63 – 1023 254  63 [         1 –  977105059] <Unknown ID>

2: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

3: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

4: 00    0   0   0 –    0   0   0 [         0 –          0] unused     

Johns-MacBook-Pro-2:~ jdb$

Many, many thanks to the community for helping me solve this problem and I shall get to downloading Testdisk and GPT Fdisk.

I’ve seen this question posted here several times before, but when I tried to do it I got a write error at the very end. I believe the solution lies in using GDisk to create a virtual MBR and add the bootcamp partition to it, since adding unallocated space partition made me have 5 partitions instead of 4 (maximum for a MBR).  I don’t know what a MBR is but this is how far I got.

What I did:

I had a MacOSX partition, and a Bootcamp partition. I used Disk Utility to make the size of my MacOSX partition smaller, so I could add that space to the bootcamp partition. A 3-second google search indicated I could do this by using Disk Utility to shrink my MacOSX partition, then boot into Windows and use a tool called “Mini Tool Partition” to add the unallocated space to the Bootcamp partition.

What happenned:Shrinking my OSX partition created a new partition of 100gigs of unallocated space.  What I now understand is, I have 5 partitions – MacOSX, Unallocated, Bootcamp, Recovery, and some other one. The bootcamp is #5.  MBR can only hold 4 so I have to use Gdisk to create a virtual MBR and dump 1-4 into the first one and use the second one for bootcamp.

When I try to restart in bootcamp, it says “no bootable device”.  When I tried using Gdisk to create a virtual MBR, at the very end I got an error “write failed with error code 1. Abort write”.

Someone please walk me through this?

Hello there.

I was trying to delete the BootCamp partition through the BootCamp Assistant (version 6.0.0 on El Capitan 10.11.1), but it said there was an error while deleting the partition. Now my disk utility says that my Macintosh HD is only 82 GB big, despite it should be around 120 GB. It says, though, the physical internal disk is the right size and there is the free space pictured, too. See screenshots below. What I need is obviously bringing my free space back where it should be (so I could maybe do some more messing up with the BootCamp again ) I’ve tried repairing the disk in Disk Utility, but it didn’t do anything. Also, I tried to repartition the disk in the Repartition menu of Disk Utility, but it says “operation failed” every time.

I know there have been many questions for this topic, but I’m scared of doing anything which wouldn’t perfectly fit my particular situation. If you were so kind to help me what to do in Terminal or the recovery to make, I’d be really thankful!