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J.Amado Author

Level 1

0 points

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

Level 1

0 points

Apr 15, 2015 11:27 AM in response to Loner T

Did I do that right?

J.Amado Author

Level 1

0 points

Apr 15, 2015 11:51 AM in response to Loner T

Not sure if I did that right. Mac OSX still not in Startup Disk. Haven't rebooted yet per your instructions.

Loner T

Level 9

59,513 points

Apr 15, 2015 12:14 PM in response to J.Amado

The MBR now looks correct. You can now run diskutil list and should see a normal display (can you post it as well, just to be certain). The EasyRE changed the EFI partition from 0xEE to 0x0C and made it bootable.

J.Amado Author

Level 1

0 points

Apr 15, 2015 12:19 PM in response to Loner T

Loner T

Level 9

59,513 points

Apr 15, 2015 12:44 PM in response to J.Amado

Your Disk Utility display is confusing. Can you post the output of sudo gpt -vv -r show /dev/disk0?

J.Amado Author

Level 1

0 points

Apr 15, 2015 12:55 PM in response to Loner T

Loner T

Level 9

59,513 points

Apr 15, 2015 1:08 PM in response to J.Amado

Your GPT shows three entries, but you see multiple entries. The GPT and MBR have been updated, so it is likely that the OSX Kernel is still using stale information, as it warns. This step is risky, but can you reboot. If OSX does not boot, a re-install of OSX may be required.

J.Amado Author

Level 1

0 points

Apr 15, 2015 1:39 PM in response to Loner T

Ok so I think I'm good right?

Loner T

Level 9

59,513 points

Apr 15, 2015 1:46 PM in response to J.Amado

Please test Bootcamp/Windows. This looks much better. Does diskutil list now look correct?

J.Amado Author

Level 1

0 points

Apr 15, 2015 2:28 PM in response to Loner T

Loner T

Level 9

59,513 points

Apr 15, 2015 2:42 PM in response to J.Amado

What about Windows?

J.Amado Author

Level 1

0 points

Apr 15, 2015 2:42 PM in response to Loner T

Ok so from windows I can use the bootcamp icon to switch back to OSX without a problem. Using Startup Disk on the Mac side to switch back to Windows however does not work. The computer restarts and then goes to a black screen with a flashing white cursor and stays there. From that point if I hold the power button to turn the computer off and then turn it back on it boots into Windows normally.