Bootcamp gone after partitioning

Question

Bootcamp gone after partitioning

I've looked throughRe: Repairing Boot Camp after creating new partition and can't seem to yield anything when following many of the steps given. I have very little experience with Mac so perhaps I didn't follow some steps properly.

I have a Macbook Pro running 10.9.5 OS. I partitioned my drive using the Mac tool within OS and a Windows tool which I can't remember the name of on the MS side. I didn't notice any issues until I left Windows for OS and tried rebooting into Windows again. The Bootcamp option was gone:

At this point I'd be happy just to get the data off the Windows side and will buy a dedicated work computer once complete. If someone could offer some guidance it would be appreciated

Here the result of the basic commands. Thanks in advance.

dons-mbp:~ donharward$ sudo gdisk /dev/disk0

Password:

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): p

Disk /dev/disk0: 490234752 sectors, 233.8 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 928B19BE-1A86-4B16-A275-7B8BD168BA34

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 490234718

Partitions will be aligned on 8-sector boundaries

Total free space is 115635173 sectors (55.1 GiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 236613727 112.6 GiB AF00 Untitled

3 236613728 237883263 619.9 MiB AB00 Recovery HD

4 353517568 490233855 65.2 GiB 0700 BOOTCAMP

Command (? for help):

iPhone 4S, iOS 5.0.1

Posted on Nov 10, 2015 7:57 AM

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Answer 1

Loner T

Level 9

59,513 points

Nov 10, 2015 8:03 AM in response to donfromduvall

Do not modify the partitions in any way! Post the output of

sudo fdisk /dev/disk0

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Answer 2

Nov 10, 2015 8:17 AM in response to Loner T

I wouldn't have had I had a clue this would happen or if there was a single warning throughout the process.

Command (? for help): sudo fdisk /dev/disk0

You may need to edit /etc/fstab and/or your boot loader configuration!

Command (? for help):

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Answer 3

Loner T

Level 9

59,513 points

Nov 10, 2015 8:19 AM in response to donfromduvall

This command is typed in the Terminal, not inside GPT Fdisk. You will need to quit Gdisk first.

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Answer 4

Nov 10, 2015 8:24 AM in response to Loner T

I apologize.

dons-mbp:~ donharward$ sudo fdisk /dev/disk0

Password:

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 0 0 2 - 25 127 14 [ 1 - 409639] <Unknown ID>

2: AF 25 127 15 - 1023 254 63 [ 409640 - 236204088] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 236613728 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 237883392 - 251428864] HPFS/QNX/AUX

dons-mbp:~ donharward$

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Answer 5

Loner T

Level 9

59,513 points

Nov 10, 2015 9:12 AM in response to donfromduvall

Can you post the output of

sudo gpt -vv -r show /dev/disk0

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Answer 6

Nov 10, 2015 9:14 AM in response to Loner T

Sure:

dons-mbp:~ donharward$ sudo gpt -vv -r show /dev/disk0

Password:

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

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

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

gpt show: error: bogus map

gpt show: unable to open device '/dev/disk0': Undefined error: 0

dons-mbp:~ donharward$

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Answer 7

Loner T

Level 9

59,513 points

Nov 10, 2015 10:44 AM in response to donfromduvall

1. Your GPT has CRC errors.

2. Your GPT and MBR do not match (using Gdisk output).

MBR

*4: 07 1023 254 63 - 1023 254 63 [ 237883392 - 251428864] HPFS/QNX/AUX

GPT

4 353517568 490233855 65.2 GiB 0700 BOOTCAMP

Does Windows boot properly?

We will need to use Gdisk to overwrite the GPT with the MBR start/size information.

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Answer 8

Nov 10, 2015 11:03 AM in response to Loner T

Windows does not boot. I wouldn't even know how to check as the standard method I use is through the StartDisk application within OS and the 'Bootcamp' partition does not exist.

This "We will need to use Gdisk to overwrite the GPT with the MBR start/size information." is the next step?

Thanks for your help.

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Answer 9

Loner T

Level 9

59,513 points

Nov 10, 2015 2:48 PM in response to donfromduvall

Your partition table is

GPT 3 Start	GPT 3 Size	GPT 3 End	NTFS Start	Sector Offset	NTFS Size	NTFS End	Sector Offset (MB)	NTFS(Gb)	Disk End	Disk Difference
236613728	1269536	237883264	237883392	128	251428864	489312255	0	119.89	490234752	922497

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Answer 10

Loner T

Level 9

59,513 points

Nov 10, 2015 3:45 PM in response to donfromduvall

You need to use the following steps. If you see any error messages during the following steps, please stop and post back here with the error message. The following steps have values from your Testdisk output (and you can verify) in Steps 7 and 8. Please notice the'+' sign in step 8 (this is called offset notation). The text in parentheses is for informational purpose to describe the action being taken. Gdisk has one-character commands except when entering numbers.

Rebuild GPT4 using start/end offsets

Sudo gdisk /dev/rdisk0
P (print the full list of parts)
D (delete)
4 (part 4)
N (new part)
4 (part 4)
237883392 ( - Start offset in sectors or the start point for Bootcamp part)
+251428864 ( - Size offset, as opposed to End offset)
0700 (Windows part type)
P (print list of all parts just to see what changes will be made)
W (Write the new GPT)
Y (Yes! really write the new GPT)

This will delete and re-write the GPT partition info for /dev/disk0s4.

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Answer 11

Nov 10, 2015 3:14 PM in response to Loner T

Ive completed the above steps, restarted and the Bootcamp drive appeared. I then went to reboot using into Windows but get this message at a command prompt.

"No bootable device--insert boot disk and continue"

I don't have a boot disk and now can't figure out how to restart on the Mac side.

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Answer 12

Nov 10, 2015 3:16 PM in response to donfromduvall

Now back on Mac side by holding option key and choosing Mac HD.

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Answer 13

Loner T

Level 9

59,513 points

Nov 10, 2015 3:32 PM in response to donfromduvall

Can you see files in the Bootcamp volume from OS X Finder?

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Answer 14

Nov 10, 2015 3:43 PM in response to Loner T

Yes! Which is huge as now I have my applications/files to backup. Thank you very much. Up to this point I wasn't able to determine what my start/stop offset values were.

Any idea how (without a boot disk) to get Windows back?

Thanks again...I'd be lost without your input.

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Answer 15

Loner T

Level 9

59,513 points

Nov 10, 2015 3:55 PM in response to donfromduvall

Are you getting a black screen/blinking cursor or a no bootable device? If the latter, can you try the following two steps and test?

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

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