Upgraded bootcamp to Windows 10, now partition can't be found

Please download GPT Fdisk http://sourceforge.net/projects/gptfdisk/ . The following is a from W8.1 with Gdisk 0.8 in the Downloads directory. You will need to run gdisk32 (or gdisk64) in a Admin Command Windows with the command gdisk32.exe 0: . The second parameter is the digit zero followed by a colon. Once you are in the Gdisk prompt, type 'p' to print the GPT partition table and post the output.

Let me preface this by saying that I'm so sorry for being slow (I am not a techy person at all).

I downloaded GPT Fdisk and run gdisk64 (and I also tried gdisk32 with the same result) and run the program.

I copied pasted your instructions which appeared fine but when I click <enter> the program shuts down.

I wonder if that's the because it says: "Type device filename, or press <Enter> to exit:".

So again, sorry for being so slow, but how do I execute the commands?

Thanks in advance!

JohnSage wrote:

I wonder if that's the because it says: "Type device filename, or press <Enter> to exit:".

Type 0: at this prompt.

I did it but without pressing <enter> it just hangs there. Is something meant to happen when I type "0:" ?

Thanks again for your patience!

Press Enter after typing 0: .

Ok, it worked (thanks!), here's what I got:

Your partitions are intact. If you shutdown your Mac and power using the Alt/Option key, what selections do you see?

You can also try the following steps

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

How to Reset NVRAM on your Mac - Apple Support

or

Try safe mode if your Mac doesn't finish starting up - Apple Support

Hi Loner T,

Maybe you can help me also.....

Tried install linux but crashed during installation.

Now my Windows10 is also not bootable anymore....

Some info:

before linux install:

$ 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_HFS MacIntosh HD 1 200.0 GB disk0s2

3: Apple_HFS Untitled 48.7 GB disk0s3

4: Apple_HFS Recovery HD 650.0 MB disk0s4

5: Microsoft Basic Data BOOTCAMP 249.9 GB disk0s5

6: Microsoft Reserved 52.4 MB disk0s6

7: Windows Recovery 471.9 MB disk0s7

after linux install:

diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.3 GB disk0

1: EFI NO NAME 208.7 MB disk0s1

2: Apple_HFS MacIntosh HD 1 200.0 GB disk0s2

3: Microsoft Basic Data 524.3 MB disk0s3

4: Apple_HFS Recovery HD 650.0 MB disk0s4

5: Microsoft Basic Data BOOTCAMP 249.9 GB disk0s5

6: Microsoft Reserved 52.4 MB disk0s6

7: Windows Recovery 471.9 MB disk0s7

8: Linux LVM 48.5 GB disk0s8

sudo gpt -r -vv show disk0

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

gpt show: disk0: PMBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 977105059

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 2014

2048 407552 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409600 40

409640 390625000 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

391034640 240

391034880 1024000 3 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

392058880 94676992 8 GPT part - E6D6D379-F507-44C2-A23C-238F2A3DF928

486735872 1896

486737768 1269536 4 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

488007304 376

488007680 488073216 5 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976080896 102400 6 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE

976183296 921600 7 GPT part - DE94BBA4-06D1-4D40-A16A-BFD50179D6AC

977104896 131

977105027 32 Sec GPT table

977105059 1 Sec GPT header

Trying your recommendations:

sudo fdisk -e /dev/disk0

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information

fdisk: 1> p

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

Offset: 0 Signature: 0xAA55

Starting Ending

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

------------------------------------------------------------------------

1: EE 0 0 1 - 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

fdisk: 1> setpid 4

Starting Ending

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

------------------------------------------------------------------------

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Partition id ('0' to disable) [0 - FF]: [0] (? for help) 07

fdisk:*1> flag 4

Partition 4 marked active.

fdisk:*1> p

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

Offset: 0 Signature: 0xAA55

Starting Ending

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

------------------------------------------------------------------------

1: EE 0 0 1 - 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: 07 0 0 0 - 0 0 0 [ 0 - 0] HPFS/QNX/AUX

fdisk:*1> write

fdisk: /dev/disk0: Operation not permitted

Do you have any suggestions?

Thanks!

Rob

hello,

This happens because of the system integrity protection.

1. you should boot in recovery mode (CMD+R at boot or just choose recovery at boot menu),

2. then from Utilities menu chose Terminal.

3. enter the following command: csrutil disable; reboot.

After reboot you have the rights to fix the MBR.

Hi Loner T

I know it's been a while for this thread but I'm having the same issue with El capitan Mac osx. I get to the same area.

Bobbys-MacBook-Pro:~ BobbyKeung$ sudo fdisk -e /dev/disk0

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information

fdisk: 1> p

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Offset: 0 Signature: 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 - 312500408] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 312910048 - 1269536] Darwin Boot

4: 0C 1023 254 63 - 1023 254 63 [ 314179584 - 176054272] Win95 FAT32L

fdisk: 1> setpid 4

Starting Ending

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

------------------------------------------------------------------------

4: 0C 1023 254 63 - 1023 254 63 [ 314179584 - 176054272] Win95 FAT32L

Partition id ('0' to disable) [0 - FF]: [C] (? for help) 7

fdisk:*1> flag 4

Partition 4 marked active.

fdisk:*1> p

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Offset: 0 Signature: 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 - 312500408] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 312910048 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 314179584 - 176054272] HPFS/QNX/AUX

fdisk:*1> w

fdisk: /dev/disk0: Operation not permitted

whether i type in "write" or "w" i'm still not permitted. Any help would be greatly appreciated!

I'm having the same issue but regardless of typing "write" or "w" I still can't complete the operations.

Bobbys-MacBook-Pro:~ BobbyKeung$ sudo fdisk -e /dev/disk0

fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory

Enter 'help' for information

fdisk: 1> p

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Offset: 0 Signature: 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 - 312500408] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 312910048 - 1269536] Darwin Boot

4: 0C 1023 254 63 - 1023 254 63 [ 314179584 - 176054272] Win95 FAT32L

fdisk: 1> setpid 4

Starting Ending

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

------------------------------------------------------------------------

4: 0C 1023 254 63 - 1023 254 63 [ 314179584 - 176054272] Win95 FAT32L

Partition id ('0' to disable) [0 - FF]: [C] (? for help) 7

fdisk:*1> flag 4

Partition 4 marked active.

fdisk:*1> p

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Offset: 0 Signature: 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 - 312500408] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 312910048 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 314179584 - 176054272] HPFS/QNX/AUX

fdisk:*1> w

fdisk: /dev/disk0: Operation not permitted

Did you boot into Local recovery and disable SIP using csrutil disable before trying the modifications?

Please start a new discussion to avoid confusion and post the details of your issue/problem.