windows boot option is suddenly missing

Question

windows boot option is suddenly missing

Hi, two or three ago suddenly the boot option for Windows has disappeared. It is an Imac 27 inch, late 2013 model on OS X Yosemite 10.10.3 (14D136)

No i can only start OSX and it seems that windows was never there? How can i restore this? I normaly press ALT and then two boot options show up, recently only OSX. I did not changed anything. What i did see in the deleted items is a couple of files since the last days, maybe this is related?

Modelnaam: iMac

Modelaanduiding: iMac14,2

Processornaam: Intel Core i7

Processorsnelheid: 3,5 GHz

Aantal processors: 1

Totale aantal cores: 4

L2-cache (per core): 256 KB

L3-cache: 8 MB

Geheugen: 16 GB

Opstart-ROM-versie: IM142.0118.B09

SMC-versie (systeem): 2.15f7

iMac, OS X Yosemite (10.10.3)

Posted on Jun 30, 2015 3:06 PM

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Answer 1

Best reply

Loner T

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59,471 points

Jun 30, 2015 4:13 PM in response to tomfromvleuten

Was the Yosemite Recovery Update applied to your iMac?

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Answer 2

Jul 1, 2015 12:27 AM in response to Loner T

thanks, I dont think so, this is a printscreen of the updates. If it is related to an update it could be IboostUp? I have no idea for what reason this has been installed?

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Answer 3

Loner T

Level 9

59,471 points

Jul 1, 2015 4:08 AM in response to tomfromvleuten

From OSX Terminal, can you post the output of the following commands? Remove any personal information as you see fit.

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

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Answer 4

Jul 1, 2015 8:41 AM in response to Loner T

There is probably an easier way to post the output.........

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Answer 5

Loner T

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59,471 points

Jul 1, 2015 8:59 AM in response to tomfromvleuten

You have a 1TB Fusion drive. Your Windows installation is on the HDD part of the Fusion drive which is disk1. Can you post the output of

sudo gpt -vv -r show /dev/disk1

sudo fdisk /dev/disk1

Once I look at these, we can also look at the output of a dd command to look at tNTFS headers.

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Answer 6

Jul 1, 2015 9:12 AM in response to Loner T

thanks

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Answer 7

Loner T

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Jul 1, 2015 10:03 AM in response to tomfromvleuten

You do not seem to have a Windows partition as it is currently shown on disks. If you have not deleted i using BC Assistant or Disk Utility, it may be possible to recover it. You will need to download Testdisk ( http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step ) and scan your HDD (not the SSD) for any lost NTFS partitions. If you download and run Testdisk, scan /dev/rdisk1. Here is a set of starting screens for Testdisk - http://imgur.com/a/PjmnK .

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Answer 8

Jul 2, 2015 7:08 AM in response to Loner T

I am not sure if this is oke?

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Answer 9

Loner T

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Jul 2, 2015 7:11 AM in response to tomfromvleuten

This is a list of unrecoverable partitions. Press Enter/Return to Continue and you should see a list of viable and recoverable partitions.

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Answer 10

Jul 2, 2015 7:15 AM in response to Loner T

This?

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Answer 11

Loner T

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Jul 2, 2015 7:30 AM in response to tomfromvleuten

This is a table I use to verify partition sectors.

GPT 3 Start	GPT 3 Size	GPT 3 End	NTFS Start	Sector Offset	NTFS Size	NTFS End	Sector Offset (MB)	NTFS(Gb)
1952255368	1269760	1953525128	1375342417	-578182711	292966400	1668308816	(282,316)	139.6972656

1. Is the size of your Windows partition ~139GB?

2. The header seems be some where inside the OSX part of your HDD. It is roughly 280GB. Was your Windows size ~277GB?

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Answer 12

Jul 2, 2015 7:42 AM in response to Loner T

Hi, it could be right, but to be honest i am not totally sure..... I think to recognize 139GB what is under bullet 2 i really dont know.

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Answer 13

Loner T

Level 9

59,471 points

Jul 2, 2015 8:13 AM in response to tomfromvleuten

We can reduce the size of the CS volume/partition on the HDD and see if Windows can be recovered, using the 139GB size. This requires deleting the GPT3, reducing GPT2 and building the partition table with a new GPT2 for the OSX part, and creating a new GPT3 for the NTFS/Windows part.

Can you download GPT Fdisk from http://sourceforge.net/projects/gptfdisk/ and installing it. Once it is installed, can post the output of

sudo gdisk /dev/disk1

?

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