After changing my mac partition, bootcamp can't find windows anymore!

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Level 1

9 points

After changing my mac partition, bootcamp can't find windows anymore!

Hello folks,

My computer has 2 partitions, Mac os X 10.7.5 and windows 7, I had about 300gb for my Mac and 100gb for windows and 100gb unassigned. So i tried, using the disk utility to make get the Mac partition to use the unassigned space, that didn't work. So i created a third partition for my Mac to use.

On trying to reboot into windows, I got a line of text saying no bootable disk could be found. So i went back into Mac and deleted the new partition i had made, hoping this would resolve the problem… it didn't. I'm starting to panic now!

TL:DR

Orignally had 2 partitions, created a 3rd for Mac, couldn't boot into windows, deleted the new partition, still can't boot into windows, panicking...

Posted on Aug 22, 2016 10:22 AM

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Answer 1

Loner T

Level 9

59,536 points

Aug 22, 2016 10:26 AM in response to Moseywalk

Please post the output of the following OSX Terminal commands.

diskutil list

sudo fdisk /dev/disk0

sudo gpt -vv -r show /dev/disk0

Enter your password when prompted by the "sudo" commands.

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Answer 2

Moseywalk Author

Level 1

9 points

Aug 22, 2016 10:42 AM in response to Loner T

Gordons-MacBook-Pro:~ Gordo$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 269.8 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 101.2 GB disk0s4

Gordons-MacBook-Pro:~ Gordo$ sudo fdisk/dev/disk0

sudo: fdisk/dev/disk0: command not found

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

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 976773167

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 526876104 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

527285744 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

528555280 250469104

779024384 197748736 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773120 15

976773135 32 Sec GPT table

976773167 1 Sec GPT header

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Answer 3

Loner T

Level 9

59,536 points

Aug 22, 2016 10:53 AM in response to Moseywalk

The gap between GPT3 and GPT4 usually indicates a 'lost' NTFS header. Can you use El Capitan has deleted my bootcamp windows partition as a references, and download and install Testdisk and GPT Fdisk and start a Testdisk scan and look for MS Data entries. The linked discussion has a sequence of screen shots progressing through Testdisk.

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Answer 4

Moseywalk Author

Level 1

9 points

Aug 22, 2016 11:42 AM in response to Loner T

I've installed Testdisk, and i'm looking through the thread you linked. It's still all very complicated (for me) and i'm at a lost on what parts of your solution apply to my situation!

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Answer 5

Loner T

Level 9

59,536 points

Aug 22, 2016 11:48 AM in response to Moseywalk

We are looking for a NTFS entry which falls in this highlighted gap.

527285744 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

528555280 250469104

779024384 197748736 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

In the linked thread, you start Testdisk as

sudo testdisk /dev/rdisk0

This assumes that testdisk binary is in your current directory. Modify the path to ensure it is in the correct directory.

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Answer 6

Moseywalk Author

Level 1

9 points

Aug 22, 2016 12:50 PM in response to Loner T

The:

sudo testdisk /dev/rdisk0

command doesn't work… which means i have to change the directory path? Another thing i don't know how to do!

I really sorry but I find all these terminal operations darn-right confusing and a bit scary.

Can i not just double click the testdisk to start results shown below

I am really sorry but i can't make heads or tails of your other answer, if you could walk-me-through the solution i would be very grateful.

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Answer 7

Loner T

Level 9

59,536 points

Aug 22, 2016 12:56 PM in response to Moseywalk

In the Terminal window, press Enter on the Create option. Post a screen shot of the Terminal Window on the next screen.

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Answer 8

Moseywalk Author

Level 1

9 points

Aug 22, 2016 1:01 PM in response to Loner T

here we are

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Answer 9

Loner T

Level 9

59,536 points

Aug 22, 2016 1:07 PM in response to Moseywalk

Choose/highlight /dev/rdisk0 and press Enter on Proceed.

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Answer 10

Moseywalk Author

Level 1

9 points

Aug 22, 2016 1:11 PM in response to Loner T

after clicking enter twice,

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Answer 11

Loner T

Level 9

59,536 points

Aug 22, 2016 1:25 PM in response to Moseywalk

Using up/down arrow/cursor keys can change what you highlight. You do not need to press enter/return to select/highlight. Extra return/enter can sometimes cause more problems.

With EFI/GPT highlighted, press Enter/Return once. Post the next screen shot.

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