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

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Level 1

1 points

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

Hello.

So I upgraded my bootcamp from Windows 7 to Windows 10 today. After the installation it started, low-res but working. But when I booted back to the mac side to get the boot camp drivers for windows it disappeared and will no longer show when holding down ALT during boot up.

The files are there on the second partition in finder on the mac side so things should be dandy, but I can't start the partition. Does anybody know what I should do? I run the latest El capitan public beta so I guess errors like this are to be expected and if Im beyond saving I guess I only have myself to blame, but it would be great if someone could point me in the right direction.

Thanks!

/Daniel

MacBook Pro (Retina, 15-inch, Mid 2014), OS X Yosemite (10.10.5), El Capitan beta

Posted on Aug 24, 2015 5:43 AM

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Answer 1

Feb 21, 2017 3:55 AM in response to Loner T

Hi, i am having same issue. I duplicated/clone my bootcamp (Windows 10) partition to a new ssd and it is not showing up while booting (pressing alt after restart)

I have tried your provided solution here:

Repairing Boot Camp after creating new partition

All goes fine untill i have to enter 'write' or 'w' (i am entering without quotations)

fdisk:*1> write

fdisk: /dev/disk0: Operation not permitted

Can you help me out plz? My Operation System is macos sierra 10.12

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Answer 2

Loner T

Level 9

59,536 points

Aug 24, 2015 8:28 AM in response to Luderbrus

Can you post the output of the following Terminal commands?

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.

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Answer 3

Luderbrus Author

Level 1

1 points

Aug 24, 2015 8:46 AM in response to Loner T

I actually went out on a limb and did what you recommended another user in this thread: Repairing Boot Camp after creating new partition. It worked wonders so thank you! Im good now 🙂

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Answer 4

Loner T

Level 9

59,536 points

Aug 24, 2015 9:49 AM in response to Luderbrus

Excellent. 🙂

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Answer 5

Aug 24, 2015 3:13 PM in response to Loner T

I tried this as I have the exact same issue.,.. all worked except the WRITE command.

To that command, it replied:

*4: 0C 1023 254 63 - 1023 254 63 [1416679424 - 536844288] Win95 FAT32L

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

fdisk:*1> flag 4

Partition 4 marked active.

fdisk:*1> write

fdisk: /dev/disk0: Operation not permitted

Is there something else I can try?

Thanks very much for any help.

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Answer 6

Loner T

Level 9

59,536 points

Aug 24, 2015 3:30 PM in response to gregfromoxford

Your original command should be

sudo fdisk -e /dev/disk0

or

sudo fdisk -e /dev/rdisk0

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Answer 7

Aug 24, 2015 3:58 PM in response to Loner T

It was.. i just did not paste that part. The odd thing is that the 'write' command gave that error message shown above but just a simple 'w' worked.

I was able to boot back in to the bootcamp (windows 10) partition.

Thanks a ton for your assistance for all of us with this similar issue - i see you helping a lot of us and we appreciate it!

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Answer 8

Loner T

Level 9

59,536 points

Aug 24, 2015 4:02 PM in response to gregfromoxford

Thanks for the update. I am 😀 to help.

It is pretty late if you are in Oxford, UK. 😉

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Answer 9

Aug 25, 2015 3:36 PM in response to Luderbrus

Hi guys,

I am having the same "Operation not permitted" error either with 'w' or 'write'.

Using 'El Capitan' and Windows 10.

Ideas?

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Answer 10

Loner T

Level 9

59,536 points

Aug 25, 2015 4:07 PM in response to lazyphoton

Are using sudo? ELC Fdisk may not be fully working, since it is still beta.

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Answer 11

Aug 25, 2015 5:16 PM in response to Luderbrus

Yes, entered password and continued.

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Answer 12

Loner T

Level 9

59,536 points

Aug 25, 2015 5:48 PM in response to lazyphoton

You can use OS X: Installing OS X on an external volume - Apple Support and boot from Yosemite or Mavericks and run Fdisk and modify a specific disk.

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Answer 13

JohnSage

Level 1

0 points

Oct 21, 2015 2:06 PM in response to Loner T

Hi

Really hope someone will be able to help me.

I am having the exact same issue as OP but when I go to Command Prompt in Windows 10 and type

sudo fdisk -e /dev/disk0

I get a message saying 'sudo' is not recognized as an internal or external command, operable program or batch file.

What am I doing wrong at this very first stage please?

Many thanks in advance!

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Answer 14

Loner T

Level 9

59,536 points

Oct 21, 2015 2:17 PM in response to JohnSage

The commands used from the OSX side. Before you make changes, can you post the output of the usual commands from OSX Terminal?

sudo fdisk /dev/disk0

sudo gpt -vv -r show /dev/disk0

diskutil list

diskutil cs list

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Answer 15

JohnSage

Level 1

0 points

Oct 21, 2015 11:48 PM in response to Loner T

That's the thing - I'm stuck in the Windows (now 10) partition.

I can see my iOS partition but upgrading to Windows 10 has removed boot camp (along with removed the drivers for the smart mouse and the apple keyboard) and I can't get back to the iOS partition when I manually reboot and hold

down the option key.

This all happened when my dad was using my Mac and decided to uphrade to Windows 10 when he got a pop-up message without telling me!

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