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Bootcamp Windows 7 not working after Yosemite install

I have Windows 7 installed via bootcamp and after installing Yosemite, windows was no longer available via System Preferences>Startup Disk. However, it was still accessible using restart and holding alt/option. Then today I accidentally installed update 10.10.3 and now Windows is completely gone. I do not have a Time Machine Backup and have been scouring these threads for some time trying to piece together a solution to no avail.

I have seen similar threads about this topic however I have not quite found the complete solution to my specific example. Here is some info that should serve usefull to someone willing to help.

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 186.7 GB disk0s2

3: Microsoft Basic Data 64.0 GB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *4.1 GB disk1

1: DOS_FAT_32 UNTITLED 4.1 GB disk1s1

diskutil cs list

No CoreStorage logical volume groups found

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: 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 364564440 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

364974080 262144

365236224 124997632 3 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

490233856 863

490234719 32 Sec GPT table

490234751 1 Sec GPT header

sudo fdisk /dev/disk0

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

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 364564440] HFS+

3: 0C 1023 254 63 - 1023 254 63 [ 365236224 - 124997632] Win95 FAT32L

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Also...

I use this computer for work and have a lot of important stuff on the Windows side. Please help.

MacBook Pro with Retina display, OS X Yosemite (10.10.3)

Posted on Apr 13, 2015 5:23 PM

85 replies

J.Amado Author

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Apr 13, 2015 9:32 PM in response to Loner T

Loner T

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Apr 13, 2015 9:33 PM in response to J.Amado

Before you reboot, if you want, post the output of

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

J.Amado Author

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Apr 13, 2015 9:42 PM in response to Loner T

J.Amado Author

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Apr 13, 2015 9:44 PM in response to Loner T

Loner T

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Apr 13, 2015 10:03 PM in response to J.Amado

This is now a Windows cleanup. You will need to run Startup Repair. Windows thinks that its hardware configuration has been changed, due to the disk signatures having changed. Do you have the original install USB (or USB+DVD)?

The 1 sector gap between GPT2 and GPT3 can be fixed by using the first set of Gdisk steps, and adding 1 to the size of partition 2.

J.Amado Author

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Apr 13, 2015 10:04 PM in response to Loner T

i don't have the original install usb

J.Amado Author

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Apr 13, 2015 10:06 PM in response to Loner T

You are referring to these steps right?

Rebuild GPT2 and GPT3 using start/end offsets

Sudo gdisk /dev/rdisk0
P (print the full list of parts)
D (delete)
2 (part 2)
D (delete)
3 (part 3)
N (new part)
2 (part 2)
409640 - Start offset in bytes (start point for OS X)
+332169175 (Size offset as opposed to End offset)
AF (HFS+ Partition Type)
N (New Part)
3 (Part 3)
332578816 (Start offset in bytes (start point for NTFS
+157655033 (size of NTFS partition)
0700 (Windows part type)
P (print list of all parts just to see what changes will be made)
W (Write partitions).
Y (Yes!)

This will delete and re-write the GPT partition info for /dev/disk0s2 and /dev/disk0s3.

Loner T

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Apr 13, 2015 10:12 PM in response to J.Amado

Skip the following steps, because Windows is fine - 5,6,12,13,14,15,16.

Step 10 will become

+332169176 (Size offset as opposed to End offset)

You will need to rebuild the Hybrid MBR again using the same steps.

J.Amado Author

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Apr 13, 2015 10:21 PM in response to Loner T

J.Amado Author

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Apr 13, 2015 10:27 PM in response to Loner T

I rebooted and then tried to restart in windows and got the same screen as before. I probably didn't execute your last recommendation correctly. I understand that it is super late where you are and have stayed on much longer than you wanted to. Please get some rest and maybe we can continue tomorrow if you're available.

Loner T

Level 9

59,536 points

Apr 14, 2015 6:02 AM in response to J.Amado

If you have the USB (or USB+DVD) used to originally install Windows, then

1. Connect your installation media as appropriate.

2. From System Preferences -> Startup Disk, select Bootcamp (not your USB or DVD).

3. Click on Restart.

4. You should see http://imgur.com/a/1DaOE#0 and be able to Repair.

5. If this method does not work, then bootrec.exe is your next option for W7. W8+ should allow Advanced Options for Repair. Please see

a. https://support.microsoft.com/en-us/kb/927392?wa=wsignin1.0

b. https://neosmart.net/wiki/bootrec/

J.Amado Author

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Apr 14, 2015 7:13 AM in response to Loner T

I don't have the usb I originally used.

J.Amado Author

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Apr 14, 2015 7:38 AM in response to Loner T

Is it possible at this point to upgrade to Windows 8?

Loner T

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Apr 14, 2015 9:29 AM in response to J.Amado

I would not recommend a W8+ upgrade, without fixing the W7 installation first.

J.Amado Author

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Apr 14, 2015 9:32 AM in response to Loner T

That's what I figured. So I need toget sanother Windows 7 iso file and create a bootable USB then?

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Bootcamp Windows 7 not working after Yosemite install