Repairing Boot Camp after creating new partition

Question

Level 1

0 points

Repairing Boot Camp after creating new partition

Hello,

I am running OS X 10.10.1 and Windows 8x64.

I added another partition to my mac so I could store extra data on it. When I tried to boot into windows I could no longer find it when I used the alt key. But I can still find the files. I have looked online and found this link to a problem that appears to be like mine.Repairing Boot Camp after creating new partition. I realize that I need to post the output of, 1. diskutil list, 2. sudo fdisk /dev/<DiskWhereYouHaveInstalledBootcamp>, and 3. sudo gpt -v -r show /dev/<DiskWhereYouHaveInstalledBootcamp> but I do not know how to find the last two. But I am attaching a image of my disk utility. Could someone please help?

Thank you

Posted on Mar 9, 2015 9:21 AM

Reply

Answer 1

Loner T

Level 9

59,536 points

Mar 9, 2015 9:58 AM in response to BCufr

Please post the output of the following commands from OSX Terminal. "sudo" commands require your password, which will not be echoed back to you. "sudo" also warns about improper use and potential data loss due to such improper use.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

From Boot Camp 5.1: Frequently asked questions - Apple Support

Can I resize the Windows partition after installing Windows?

No. Back up your important files, then use Boot Camp Assistant to delete the old partition and create a new one.

In general Bootcamp Macs do not allow more than 4 partitions, which includes two hidden ones (EFI and Recovery HD) and two visible ones (OSX and Bootcamp). Disk Utility also has the notice as shown in your screen shot.

Reply

Answer 2

BCufr Author

Level 1

0 points

Mar 9, 2015 10:16 AM in response to Loner T

Here are the two screen shots. And do I have to remove my last partition that I made? All the partition is blank EXFAT disk image.

Reply

Answer 3

Loner T

Level 9

59,536 points

Mar 9, 2015 10:43 AM in response to BCufr

You may be able to make this work, but be war that this layout is prone to data loss and data corruption. Since your GPT4 and MBR4 look to be the same, can you post the output of

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

Reply

Answer 4

BCufr Author

Level 1

0 points

Mar 9, 2015 10:53 AM in response to Loner T

Reply

Answer 5

BCufr Author

Level 1

0 points

Mar 9, 2015 10:59 AM in response to BCufr

Here is the newest output.

Reply

Answer 6

Loner T

Level 9

59,536 points

Mar 9, 2015 11:38 AM in response to BCufr

Can you post the output for rdisk0s5?

sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

Reply

Answer 7

BCufr Author

Level 1

0 points

Mar 9, 2015 11:40 AM in response to Loner T

Reply

Answer 8

BCufr Author

Level 1

0 points

Mar 9, 2015 12:11 PM in response to BCufr

Are disk images the same as partitions?

Reply

Answer 9

Loner T

Level 9

59,536 points

Mar 9, 2015 12:42 PM in response to BCufr

BCufr wrote:

Are disk images the same as partitions?

No. Disk Images are copies of partitions/disks, depending how they were created.

Reply

Answer 10

Loner T

Level 9

59,536 points

Mar 9, 2015 12:45 PM in response to BCufr

The NTFS header is intact on rdisk0s5. It is possible to make this work.

Option 1. Create a new Hybrid MBR using GPT 2,4,5 - the downside is that Rceovery HD can be corrupted by Windows.

Option 2. Create a new Hybrid MBR with 3,4,5 - the downside is that the OSX volume cannot be read by Windows.

Option 3. Delete the exFat partition.

Reply

Answer 11

BCufr Author

Level 1

0 points

Mar 9, 2015 12:58 PM in response to Loner T

The ExFat is a disk image. If I delete that will it fix the problem.

Reply

Answer 12

BCufr Author

Level 1

0 points

Mar 9, 2015 1:42 PM in response to BCufr

Sorry, I mistyped the section before. I meant to say will it fix the problem if I delete the disk image?

Reply

Answer 13

Loner T

Level 9

59,536 points

Mar 9, 2015 1:43 PM in response to BCufr

It may or may not. My recommendation is Option 2.

Reply

Answer 14

BCufr Author

Level 1

0 points

Mar 9, 2015 1:50 PM in response to Loner T

How do I do option 2? Also, what do you mean by OSX volume cannot be read by Windows?

Reply

Answer 15

Loner T

Level 9

59,536 points

Mar 9, 2015 2:02 PM in response to BCufr

For Option 2 to work, you will need to download and install http://sourceforge.net/projects/gptfdisk/.

If you have the standard configuration, and do not have a CoreStorage volume (Yosemite default is CS), each OS contains drivers to read the volumes on the other side. For example, BC drivers include a read-only HFS+ driver. On Yosemite with CS volumes, it does not work.

ExFAT source may be a disk image, but the exFat when restored is a partition on your internal disk, which is causing problems because the Hybrid MBR no longer matches the GPT.

Reply