tomfromvleuten
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Q: 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?

Schermafbeelding 2015-07-01 om 00.01.02.png

 

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

by Loner T,Solvedanswer
Loner T Loner T
Level 7 (24,805 points)
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A:

Was the Yosemite Recovery Update applied to your iMac?

Posted on Jun 30, 2015 4:13 PM

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tomfromvleuten

Q: windows boot option is suddenly missing

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  • by Loner T,

    Loner T Loner T Jul 2, 2015 8:52 AM in response to tomfromvleuten
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    Jul 2, 2015 8:52 AM in response to tomfromvleuten

    From OSX Terminal. It should already be included in your PATH.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 2, 2015 9:18 AM in response to tomfromvleuten
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    Jul 2, 2015 9:18 AM in response to tomfromvleuten

    i openend the file op GPT with console after installation??? then  the sudo gdisk /dev/disk1 in console with this result??? is this oke? Schermafbeelding 2015-07-02 om 18.17.00.png

  • by Loner T,

    Loner T Loner T Jul 2, 2015 9:19 AM in response to tomfromvleuten
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    Jul 2, 2015 9:19 AM in response to tomfromvleuten

    Enter p, press return. Enter q, press Return.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 2, 2015 9:22 AM in response to Loner T
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    Jul 2, 2015 9:22 AM in response to Loner T

    Schermafbeelding 2015-07-02 om 18.21.42.png

  • by Loner T,

    Loner T Loner T Jul 2, 2015 9:41 AM in response to tomfromvleuten
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    Jul 2, 2015 9:41 AM in response to tomfromvleuten

    The following steps are specific to your scenario, and are not generally used.


    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 GPT and Testdisk output (and you can verify) in Steps 9, 10, 14 and 15. Please notice the '+' sign in step 15 (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 GPT2 and GPT3 using start/end offsets and size for HDD.

     

    1. Sudo gdisk /dev/rdisk1
    2. P  (print the full list of parts)
    3. D  (delete)
    4. 3  (part 3)
    5. D (delete)
    6. 2 (part 2)
    7. N  (new part)
    8. 2  (part 2)
    9. 409640 ( - Start offset in sectors or the start point for Bootcamp part)
    10. 1375342416 ( - Absolute end sector)
    11. AF05 (Core Storage part type)
    12. N (new part)
    13. 3
    14. 1375342417 ( - Start offset in sectors or the start point for Bootcamp part)
    15. +292966400 ( - End size offset. Different from Step 10 with the '+' sign)
    16. 0700
    17. P  (print list of all parts just to see what changes will be made)
    18. W (Write the new GPT)
    19. Y  (Yes! really write the new GPT)


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


    You need to Reboot for OSX to read the new partition information.


    Please post the output of


    sudo gpt -vv -r show /dev/disk1

    sudo dd if=/dev/rdisk0s3 count=1 2>/dev/null | hexdump -C


    Test 1 - Does Bootcamp Volume show up in Finder?

    Test 2 - Can you see files in Bootcamp Volume?

    Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

     

    Depending on results, we can proceed further.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 2, 2015 10:07 AM in response to Loner T
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    Jul 2, 2015 10:07 AM in response to Loner T

    hi, i did everything, see no errors and after reboot nothing happens except a sign (circle with stripe) a tried couple of times, also tried to press alt key,

  • by Loner T,

    Loner T Loner T Jul 2, 2015 10:16 AM in response to tomfromvleuten
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    Jul 2, 2015 10:16 AM in response to tomfromvleuten

    Can you boot into Internet Recovery (Command + Opt + R) - OS X: About OS X Recovery - Apple Support ? Changing CS volumes can be a risky procedure.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 2, 2015 10:25 AM in response to Loner T
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    Jul 2, 2015 10:25 AM in response to Loner T

    no nothing works. Tried cmd - R and CMR - opt/alt - R as wel

  • by Loner T,

    Loner T Loner T Jul 2, 2015 10:39 AM in response to tomfromvleuten
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    Jul 2, 2015 10:39 AM in response to tomfromvleuten

    OS X: Installing OS X on an external volume - Apple Support should be the next logical step, if possible.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 2, 2015 11:15 AM in response to Loner T
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    Jul 2, 2015 11:15 AM in response to Loner T

    Can i also prepar this on a Windows pc? Besides an iPad i have no OSX machines........

  • by Loner T,

    Loner T Loner T Jul 2, 2015 11:22 AM in response to tomfromvleuten
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    Jul 2, 2015 11:22 AM in response to tomfromvleuten

    Instead of using OSX on the external disk, you can also use a Linux Live CD (on USB) like Knoppix, Hiren's Boot CD or similar software. The Linux Live CDs should also have GPT Fdisk (gdisk) so it will make it a bit easier to put the old GPT on the HDD back.

     

    When we modified the HDD GPT, OSX did not like the change. We also 'stole' the Recovery part on the HDD, which the CS volume is complaining about.

     

    How much disk space do you think your OSX installation occupies, not allocated. If the used space will fit on the SSD part, one option is to remove the HDD from the CS volume, if OSX GPT can be fixed.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 3, 2015 3:55 AM in response to Loner T
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    Jul 3, 2015 3:55 AM in response to Loner T

    hi, i manged to install osx on a extern drive......what is next step? pressing alt gives me three options

    macintosh hd

    name external HD

    recovery 10.10.4

  • by Loner T,

    Loner T Loner T Jul 3, 2015 7:45 AM in response to tomfromvleuten
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    Jul 3, 2015 7:45 AM in response to tomfromvleuten

    Please boot from the external HD. We should look at the the GPT, and change it back, if necessary to the old one you have posted here. We need to continue searching for other MS Data partitions.

  • by tomfromvleuten,

    tomfromvleuten tomfromvleuten Jul 3, 2015 7:51 AM in response to Loner T
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    Jul 3, 2015 7:51 AM in response to Loner T

    oke, it works

  • by Loner T,

    Loner T Loner T Jul 3, 2015 8:11 AM in response to tomfromvleuten
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    Jul 3, 2015 8:11 AM in response to tomfromvleuten

    Can you install GPT Fdisk on the volume that you are currently booting from?

     

    Once you have it in place, we can revert to the older GPT and test if the internal HD will boot from OS X. The other option is to scan the internal disk while booted from the external disk via Testdisk. It may not make much difference in the results, but the scan will be a bit faster.

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