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Level 1

0 points

Boot Camp won't start after OSX Yosemite upgrade

Like so many others, I installed OSX Yosemite this morning and now Boot Camp no longer works.

After I updated to Yosemite I restarted my computer, held down alt, and was presented nothing but a Macintosh HD. I followed “Loner T’s” instructions…

ndiskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

Enter you password when prompted.

…and now a windows option is available during startup. However, when selected, all I get is a black screen with "A disk read error occurred" notice.

I’m in serious trouble if I cannot repair this issue. PLEASE HELP.

iMac, OS X Yosemite (10.10), Windows 7

Posted on Oct 18, 2014 12:00 PM

59 replies

Oct 22, 2014 9:00 AM in response to Baja Tym

Hi,

This stupid apple developers won't allow me to install the get disk.

Please help me. my bootcamp was deleted after the update.

Baja Tym Author

Level 1

0 points

Oct 22, 2014 9:42 AM in response to r7_human8y

This entire experience has been horrible. I must say this is the only issue I've ever had with an Apple produce, but it hasn't changed my love of their products. I worked on it this issue for days, followed all of the directions, all of the recommendations of of Loner T and some others. In the end, I went to Best Buy and picked up an external harddrive. I then used TestDisk to search the Windows partition and copy all of my recoverable files to the Mac side. I then made a time machine backup to my new external drive. When I get home today I'll be formatting the entire drive and starting from scratch.

Loner T

Level 9

59,471 points

Oct 22, 2014 9:52 AM in response to Baja Tym

You should provide Support Feedback to Apple.

Loner T

Level 9

59,471 points

Oct 22, 2014 9:53 AM in response to r7_human8y

r7_human8y wrote:

Hi,

This stupid apple developers won't allow me to install the get disk.

Please help me. my bootcamp was deleted after the update.

Click on the Security under System Preferences and click on Open anyway.

Oct 25, 2014 4:18 PM in response to Loner T

Where do you type the first 4 commands?

Loner T

Level 9

59,471 points

Oct 25, 2014 4:21 PM in response to Bobbyjoe456

Can you start a new thread, pretty please? The commands are typed in Applications -> Utilities -> Terminal.

It prevents two posters getting confusing steps to solve specific problems.

You can post a reference to the new thread on this thread.

Oct 28, 2014 6:52 AM in response to Loner T

I don't mean to jack this thread, but this bug has got me in a tough bind because of the contents of my Win7 partition. I started a new thread and I'd love some guidance from anyone who's solved this problem before. Another Win7 Bootcamp failure with Yosemite upgrade (missing 34 GB)

Many thanks for spending so much time and patience helping people out. Hopefully Apple will catch on quickly and clean this up.

Baja Tym Author

Level 1

0 points

Oct 28, 2014 9:42 AM in response to andrewjf33

I worked in this issue for days. In the end I salvaged my Mac and Windows files and started from scratch.

Here is what I did…

1. I went to Best Buy and picked up an external hard drive.

2. I used a program called TestDisk to search the Windows partition for any my Windows files.

3. I copied all of my retrievable Windows files to the Mac partition using the TestDisk options.

4. Using my new external drive, I made a Time Machine backup of my Mac.

5. I then formatted my Mac and accomplished a fresh install of OS 10.10.

6. I installed Windows 7 using Boot Camp.

Links:

http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step

https://discussions.apple.com/thread/6574886?start=0&tstart=0

Mar 20, 2015 5:21 PM in response to Loner T

I have this same problem, but I have one quesiton, how did you know to move it from :

1752625152 200898560 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1118887936 834635769

I see where you get 1752625152 200898560 from, and 1118887936 , but where do you get the 834635769 from?

I am trying to follow these instuctions

Loner T

Level 9

59,471 points

Mar 20, 2015 6:15 PM in response to hornbymanzpc

Can you post the screen shot of the Testdisk where you see your files and I can explain what you need to use?

It will look like the following.

Mar 20, 2015 6:57 PM in response to Loner T

How do I get test data to show my files?

Loner T

Level 9

59,471 points

Mar 20, 2015 6:59 PM in response to hornbymanzpc

Please start a new thread and post the output of the following Terminal commands.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

sudo commands require your password, which is not echoed back to you. You will get a warning about improper use and potential data loss.

Mar 20, 2015 7:03 PM in response to Loner T

OSX bootcamp not showing on Option key boot up

trwd

Level 1

17 points

Sep 20, 2015 8:14 PM in response to Loner T

I'm going to start a "new" thread about this seemingly common problem: Bootcamp boot clobbered by Yosemite upgrade. Help, Loner T!

Boot Camp won't start after OSX Yosemite upgrade