bootcamp partition missing

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Level 1

9 points

bootcamp partition missing

I have a Macbook Pro with Bootcamp Windows 7 installed. Was working on Mac OSX side with a external hard drive attached. Upon rebooting to load into Windows, the system was attempting to load a windows drive from the external HDD. When removing the external HDD, the option to load the windows Bootcamp drive disappeared.

I booted back into Mac OSX and the Bootcamp drive is no longer on the desktop, the Disk Utilities shows only the Mac partition. The entire partition/space from the Bootcamp drive is gone.

Through another thread, I was able to get the Windows drive to reappear in the boot up screen (holding option), but it loads to a black screen and remains so.

Posted on Apr 23, 2018 7:09 PM

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Answer 1

Loner T

Level 9

59,536 points

Apr 25, 2018 4:59 PM in response to n156

This requires Testdisk to go further. Can you use El Capitan has deleted my bootcamp windows partition as a references, download and install Testdisk and use the UI flow in the link as a guide to start a scan and run a Quick search?

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Answer 2

Loner T

Level 9

59,536 points

Apr 24, 2018 4:58 PM in response to n156

Since you are on macOS 10.8.5, SIP is not a feature on your Mac. Can you boot into Internet Recovery, click on Utilities -> Terminal, and run

diskutil unmount disk0

gpt add -i 4 -b 158203448 -s 332031271 -t windows /dev/disk0

diskutil repairDisk disk0

Reboot normally, and check if Finder shows a Windows partition.

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Answer 3

Loner T

Level 9

59,536 points

Apr 24, 2018 4:06 PM in response to n156

You may need to disable SIP - SIP - Enable and Disable steps. Post the output of

sudo gpt -vv -r show /dev/disk0

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Answer 4

Loner T

Level 9

59,536 points

Apr 25, 2018 2:01 PM in response to n156

Can you post the output of

diskutil list

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

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Answer 5

Loner T

Level 9

59,536 points

Apr 24, 2018 3:52 AM in response to n156

What is the year/model of your Mac (do not post the serial number)? What is the macOS Version?

From macOS Terminal, can you post the output of

diskutil list

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Answer 6

n156 Author

Level 1

9 points

Apr 25, 2018 2:08 PM in response to Loner T

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 80.1 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 170.0 GB disk0s4

00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

*

00000200

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Answer 7

Loner T

Level 9

59,536 points

May 21, 2018 6:00 PM in response to n156

From the top, skip the first two MS Data entries, starting with the third one, press p and look for Windows files. Take a screen shot and press Escape only once to get back to the list, then move to the next entry and use the same p command. We are looking for a partition similar to this one...

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Answer 8

Loner T

Level 9

59,536 points

Apr 24, 2018 7:21 PM in response to n156

The repairDisk operation will rebuild the EFI partition, if necessary. Type 'y' and continue.

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Answer 9

Loner T

Level 9

59,536 points

May 21, 2018 2:41 PM in response to n156

If you scroll down, you should see more entries. We are looking for one or more MS Data entries.

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Answer 10

Loner T

Level 9

59,536 points

May 22, 2018 3:53 PM in response to n156

Testdisk package includes a utility called PhotoRec. You can try that and see if it can recognize any files.

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Answer 11

Loner T

Level 9

59,536 points

May 22, 2018 7:44 PM in response to n156

You will need a working Windows installation for all Windows-based tools. You may want to consider a VMWare trial version and a VM to see if it will help you try them.

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Answer 12

n156 Author

Level 1

9 points

Apr 24, 2018 11:11 AM in response to Loner T

Macbook Pro Retina, 13-in, Early 2013

OSX 10.8.5

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 80.1 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

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Answer 13

n156 Author

Level 1

9 points

Apr 24, 2018 4:50 PM in response to Loner T

When attempting to disable SIP, I get -bash: csrutil: command not found

Here are the results of the sudo gpt -vv -r show /dev/disk0:

gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Malformed MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 490234751

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 156524272 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

156933912 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

158203448 332031271

490234719 32 Sec GPT table

490234751 1 Sec GPT header

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Answer 14

n156 Author

Level 1

9 points

Apr 24, 2018 5:28 PM in response to Loner T

Just checking before I proceed, I had to use diskutil unmountDisk disk0. Also, after the diskutil repairDisk disk0 command it gives the prompt that the partition map might erase disk0s1. Is this just a risk I am taking this point?

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Answer 15

Apr 27, 2018 12:21 AM in response to Loner T

Hi I’m having a problem too you mind helping whenever I try and install windows I get a error that says disk could not be partitioned I’ve seen you help other people out and I would ask you there but I couldn’t so I wanted to ask you here if you could help me I don’t really know much about macs and I want to boot my IMac mid 2011 on high Sierra into windows 8.1 I’ve tried things like reset pram and stuff but I really don’t know what I’m doing can you walk me through this

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bootcamp partition missing

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