alberto.benamu
Level 1 (8 points)

Q: How to really install Windows 8.1 on iMac 5K 1TB FD.

Hi,

 

I have tried more than 10 times to try to install Windows 8.1 either using BootCamp or partitioning the FD manually, the Windows partition is always on Disk01 partition 04, which everytime Windows rejects to install, I honestly do not know what else to do in order to have windows install or even recognise the partition as available to be used for installing it.

 

Anybody with ideas on how to get this right?

 

I have been lucky that Boot Camp Assistant has restored my FD everytime, not really crazy on deleting the CS LV.

 

Thanks in advance,

 

AJ

iMac with Retina 5K display, OS X Yosemite (10.10.3)

Posted on May 30, 2015 9:03 PM

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alberto.benamu

Q: How to really install Windows 8.1 on iMac 5K 1TB FD.

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  • by Loner T,

    Loner T Loner T May 30, 2015 9:17 PM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 30, 2015 9:17 PM in response to alberto.benamu

    Based on your description it seems that the iMac wants to build a MBR which is invalid.

     

    Can you post  the output of the following Terminal commands?

     

    diskutil list

    diskutil cs list

    sudo gpt -vv -r show /dev/disk0

    sudo fdisk /dev/disk0

    sudo gpt -vv -r show /dev/disk1

    sudo fdisk /dev/disk1

     

     

    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.

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 30, 2015 9:50 PM in response to Loner T
    Level 1 (8 points)
    May 30, 2015 9:50 PM in response to Loner T

    Abertos-iMac-2:~ alberto$ diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *121.3 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage                         121.0 GB   disk0s2

       3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk1

       1:                        EFI EFI                     209.7 MB   disk1s1

       2:          Apple_CoreStorage                         999.9 GB   disk1s2

       3:                 Apple_Boot Boot OS X               134.2 MB   disk1s4

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS Macintosh HD           *1.1 TB     disk2

                                     Logical Volume on disk1s2, disk0s2

                                     48724DF5-DA59-42D6-BA55-2F4985739B26

                                     Unencrypted Fusion Drive

    /dev/disk3

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *320.1 GB   disk3

       1:                        EFI EFI                     209.7 MB   disk3s1

       2:                  Apple_HFS DATA 5                  319.7 GB   disk3s2

    /dev/disk4

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *3.0 TB     disk4

       1:                        EFI EFI                     314.6 MB   disk4s1

       2:                  Apple_HFS DATA 1                  3.0 TB     disk4s2

    /dev/disk5

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *500.1 GB   disk5

       1:                        EFI EFI                     209.7 MB   disk5s1

       2:                  Apple_HFS Photos and More         499.8 GB   disk5s2

    /dev/disk6

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *250.1 GB   disk6

       1:                        EFI EFI                     209.7 MB   disk6s1

       2:                  Apple_HFS DATA 3                  249.7 GB   disk6s2

    /dev/disk7

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *250.1 GB   disk7

       1:                        EFI EFI                     209.7 MB   disk7s1

       2:                  Apple_HFS DATA 6                  249.7 GB   disk7s2

    /dev/disk8

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk8

       1:                        EFI EFI                     209.7 MB   disk8s1

       2:                  Apple_HFS DATA 4                  999.9 GB   disk8s2

    /dev/disk9

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk9

       1:                        EFI EFI                     209.7 MB   disk9s1

       2:                  Apple_HFS DATA 2                  999.9 GB   disk9s2

    /dev/disk10

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk10

       1:                        EFI EFI                     209.7 MB   disk10s1

       2:                  Apple_HFS Clone drive             998.6 GB   disk10s2

       3:                 Apple_Boot Recovery HD             1.3 GB     disk10s3

    /dev/disk11

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     Apple_partition_scheme                        *107.8 MB   disk11

       1:        Apple_partition_map                         32.3 KB    disk11s1

       2:                  Apple_HFS Install Google Drive    107.8 MB   disk11s2

    Abertos-iMac-2:~ alberto$ diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *121.3 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage                         121.0 GB   disk0s2

       3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk1

       1:                        EFI EFI                     209.7 MB   disk1s1

       2:          Apple_CoreStorage                         999.9 GB   disk1s2

       3:                 Apple_Boot Boot OS X               134.2 MB   disk1s4

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS Macintosh HD           *1.1 TB     disk2

                                     Logical Volume on disk1s2, disk0s2

                                     48724DF5-DA59-42D6-BA55-2F4985739B26

                                     Unencrypted Fusion Drive

    /dev/disk3

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *320.1 GB   disk3

       1:                        EFI EFI                     209.7 MB   disk3s1

       2:                  Apple_HFS DATA 5                  319.7 GB   disk3s2

    /dev/disk4

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *3.0 TB     disk4

       1:                        EFI EFI                     314.6 MB   disk4s1

       2:                  Apple_HFS DATA 1                  3.0 TB     disk4s2

    /dev/disk5

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *500.1 GB   disk5

       1:                        EFI EFI                     209.7 MB   disk5s1

       2:                  Apple_HFS Photos and More         499.8 GB   disk5s2

    /dev/disk6

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *250.1 GB   disk6

       1:                        EFI EFI                     209.7 MB   disk6s1

       2:                  Apple_HFS DATA 3                  249.7 GB   disk6s2

    /dev/disk7

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *250.1 GB   disk7

       1:                        EFI EFI                     209.7 MB   disk7s1

       2:                  Apple_HFS DATA 6                  249.7 GB   disk7s2

    /dev/disk8

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk8

       1:                        EFI EFI                     209.7 MB   disk8s1

       2:                  Apple_HFS DATA 4                  999.9 GB   disk8s2

    /dev/disk9

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk9

       1:                        EFI EFI                     209.7 MB   disk9s1

       2:                  Apple_HFS DATA 2                  999.9 GB   disk9s2

    /dev/disk10

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk10

       1:                        EFI EFI                     209.7 MB   disk10s1

       2:                  Apple_HFS Clone drive             998.6 GB   disk10s2

       3:                 Apple_Boot Recovery HD             1.3 GB     disk10s3

    Abertos-iMac-2:~ alberto$

     

    Abertos-iMac-2:~ alberto$ diskutil cs list

    CoreStorage logical volume groups (1 found)

    |

    +-- Logical Volume Group 63807AF7-C821-425A-A428-873A086536C7

        =========================================================

        Name:         Internal Drive

        Status:       Online

        Size:         1120849764352 B (1.1 TB)

        Free Space:   131072 B (131.1 KB)

        |

        +-< Physical Volume 8B4D1DB8-1A47-4D0A-BB96-1E96F5020B03

        |   ----------------------------------------------------

        |   Index:    0

        |   Disk:     disk1s2

        |   Status:   Online

        |   Size:     999860912128 B (999.9 GB)

        |

        +-< Physical Volume B63B07E4-B61A-41AF-A822-E42321F41AA9

        |   ----------------------------------------------------

        |   Index:    1

        |   Disk:     disk0s2

        |   Status:   Online

        |   Size:     120988852224 B (121.0 GB)

        |

        +-> Logical Volume Family 694818D1-4907-48CA-8D4A-1BC54BDBA0AF

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

            Encryption Status:       Unlocked

            Encryption Type:         None

            Conversion Status:       NoConversion

            Conversion Direction:    -none-

            Has Encrypted Extents:   No

            Fully Secure:            No

            Passphrase Required:     No

            |

            +-> Logical Volume 48724DF5-DA59-42D6-BA55-2F4985739B26

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

                Disk:                  disk2

                Status:                Online

                Size (Total):          1114994376704 B (1.1 TB)

                Conversion Progress:   -none-

                Revertible:            No

                LV Name:               Macintosh HD

                Volume Name:           Macintosh HD

                Content Hint:          Apple_HFS

     

    Abertos-iMac-2:~ alberto$ sudo gpt -vv -r show /dev/disk0

    Password:

    gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176

    gpt show: /dev/disk0: PMBR at sector 0

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

    gpt show: /dev/disk0: Sec GPT at sector 236978175

          start       size  index  contents

              0          1         PMBR

              1          1         Pri GPT header

              2         32         Pri GPT table

             34          6        

             40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

         409640  236306352      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

      236715992     262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      236978136          7        

      236978143         32         Sec GPT table

      236978175          1         Sec GPT header

     

     

    Abertos-iMac-2:~ alberto$ sudo fdisk /dev/disk0

    Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]

    Signature: 0xAA55

             Starting       Ending

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

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

    1: EE 1023 254  63 - 1023 254  63 [         1 -  236978175] <Unknown ID>

    2: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

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

     

     

    Abertos-iMac-2:~ alberto$ sudo gpt -vv -r show /dev/disk1

    gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168

    gpt show: /dev/disk1: PMBR at sector 0

    gpt show: /dev/disk1: Pri GPT at sector 1

    gpt show: /dev/disk1: Sec GPT at sector 1953525167

           start        size  index  contents

               0           1         PMBR

               1           1         Pri GPT header

               2          32         Pri GPT table

              34           6        

              40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

          409640  1952853344      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

      1953262984      262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      1953525128           7        

      1953525135          32         Sec GPT table

      1953525167           1         Sec GPT header

     

     

    Abertos-iMac-2:~ alberto$ sudo fdisk /dev/disk1

    Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 sectors]

    Signature: 0xAA55

             Starting       Ending

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

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

    1: EE 1023 254  63 - 1023 254  63 [         1 - 1953525167] <Unknown ID>

    2: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

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

     

    There you are, thank you.

  • by Loner T,

    Loner T Loner T May 31, 2015 4:48 AM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 31, 2015 4:48 AM in response to alberto.benamu

    Please disconnect all external storage before you attempt to install Windows. In your case it is disk3 - disk10.

     

    Please also see Boot Camp: "We couldn't create a new partition or locate an existing one" alert during Windows 8 install - Apple Support.

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 31, 2015 9:29 AM in response to Loner T
    Level 1 (8 points)
    May 31, 2015 9:29 AM in response to Loner T

    All external HDDs are disconnected during the creation of the partition and trying to install Windows.

     

    The link you gave me, that is not the issue.

    Like I said all external HDDs are only connected while running Yosemite.

     

    Any other ideas, please!!!!

     

    Thanks

  • by Loner T,

    Loner T Loner T May 31, 2015 10:22 AM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 31, 2015 10:22 AM in response to alberto.benamu

    In a Fusion drive configuration, Windows is installed on the HDD part if BCA is used. If all external storage is disconnected,

     

    1. Are you using a USB Installer or an external DVD?

    2. If you are using a USB installer, have you verified that your USB is a USB2 , not a USB3 flash device?

    3. Does the Windows Installer Start correctly?

    4. Do your Keyboard and Mouse function properly, if the installer starts?

    5. Please re-run BCA and try to install Windows, let it fail, and then your partitions can be re-examined using the same commands to check if there is a partitioning issue?

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 31, 2015 10:26 AM in response to Loner T
    Level 1 (8 points)
    May 31, 2015 10:26 AM in response to Loner T

    I am using a USB installer which is USB2, Windows stars correctly, wireless keyboard and mouse work during the setup period.

    Will do number 5 and let you know.

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 31, 2015 3:44 PM in response to alberto.benamu
    Level 1 (8 points)
    May 31, 2015 3:44 PM in response to alberto.benamu

    Windows install failed again....

     

    Abertos-iMac-2:~ alberto$ diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *121.3 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage                         121.0 GB   disk0s2

       3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk1

       1:                        EFI EFI                     209.7 MB   disk1s1

       2:          Apple_CoreStorage                         646.9 GB   disk1s2

       3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3

       4:       Microsoft Basic Data                         353.0 GB   disk1s4

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS Macintosh HD           *762.0 GB   disk2

                                     Logical Volume on disk1s2, disk0s2

                                     48724DF5-DA59-42D6-BA55-2F4985739B26

                                     Unencrypted Fusion Drive

     

    Abertos-iMac-2:~ alberto$ diskutil cs list

    CoreStorage logical volume groups (1 found)

    |

    +-- Logical Volume Group 63807AF7-C821-425A-A428-873A086536C7

        =========================================================

        Name:         Internal Drive

        Status:       Online

        Size:         767855370240 B (767.9 GB)

        Free Space:   196608 B (196.6 KB)

        |

        +-< Physical Volume 8B4D1DB8-1A47-4D0A-BB96-1E96F5020B03

        |   ----------------------------------------------------

        |   Index:    0

        |   Disk:     disk1s2

        |   Status:   Online

        |   Size:     646866518016 B (646.9 GB)

        |

        +-< Physical Volume B63B07E4-B61A-41AF-A822-E42321F41AA9

        |   ----------------------------------------------------

        |   Index:    1

        |   Disk:     disk0s2

        |   Status:   Online

        |   Size:     120988852224 B (121.0 GB)

        |

        +-> Logical Volume Family 694818D1-4907-48CA-8D4A-1BC54BDBA0AF

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

            Encryption Status:       Unlocked

            Encryption Type:         None

            Conversion Status:       NoConversion

            Conversion Direction:    -none-

            Has Encrypted Extents:   No

            Fully Secure:            No

            Passphrase Required:     No

            |

            +-> Logical Volume 48724DF5-DA59-42D6-BA55-2F4985739B26

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

                Disk:                  disk2

                Status:                Online

                Size (Total):          761999917056 B (762.0 GB)

                Conversion Progress:   -none-

                Revertible:            No

                LV Name:               Macintosh HD

                Volume Name:           Macintosh HD

                Content Hint:          Apple_HFS

     

    Abertos-iMac-2:~ alberto$ sudo gpt -vv -r show /dev/disk0

    Password:

    gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176

    gpt show: /dev/disk0: PMBR at sector 0

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

    gpt show: /dev/disk0: Sec GPT at sector 236978175

          start       size  index  contents

              0          1         PMBR

              1          1         Pri GPT header

              2         32         Pri GPT table

             34          6        

             40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

         409640  236306352      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

      236715992     262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      236978136          7        

      236978143         32         Sec GPT table

      236978175          1         Sec GPT header

     

    Abertos-iMac-2:~ alberto$ sudo fdisk /dev/disk0

    Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]

    Signature: 0xAA55

             Starting       Ending

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

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

    1: EE 1023 254  63 - 1023 254  63 [         1 -  236978175] <Unknown ID>

    2: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

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

     

    Abertos-iMac-2:~ alberto$ sudo gpt -vv -r show /dev/disk1

    gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168

    gpt show: /dev/disk1: PMBR at sector 0

    gpt show: /dev/disk1: Pri GPT at sector 1

    gpt show: /dev/disk1: Sec GPT at sector 1953525167

           start        size  index  contents

               0           1         PMBR

               1           1         Pri GPT header

               2          32         Pri GPT table

              34           6        

              40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

          409640  1263411168      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

      1263820808      262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      1264082952        2040        

      1264084992   689438720      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

      1953523712        1423        

      1953525135          32         Sec GPT table

      1953525167           1         Sec GPT header

     

    Abertos-iMac-2:~ alberto$ sudo fdisk /dev/disk1

    Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 sectors]

    Signature: 0xAA55

             Starting       Ending

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

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

    1: EE 1023 254  63 - 1023 254  63 [         1 - 1953525167] <Unknown ID>

    2: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

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

     

    I honestly think I am going to give up installing Windows, will revert to full FD with BCA.

    Thanks.

     

    BTW, Windows installer did not mount disk1, it was only disk0.

  • by Loner T,

    Loner T Loner T May 31, 2015 3:49 PM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 31, 2015 3:49 PM in response to alberto.benamu

    The Installer has correctly set it up. Did you scroll down in the following window to find disk1:4 Bootcamp?

     

    S0003_VistaInstall.png

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 31, 2015 3:53 PM in response to Loner T
    Level 1 (8 points)
    May 31, 2015 3:53 PM in response to Loner T

    I did and I formatted it and it still was telling that it would not install because of GPT.

    There is a GPT issue that I don't understand.

  • by Loner T,

    Loner T Loner T May 31, 2015 3:54 PM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 31, 2015 3:54 PM in response to alberto.benamu

    Did it give you an error about GPT vs MBR partition types? If yes, that is an easy fix. Can you post a screen shot of the exact error message?

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 31, 2015 3:58 PM in response to Loner T
    Level 1 (8 points)
    May 31, 2015 3:58 PM in response to Loner T

    how can you get a screenshot while being on windows setup?

    I will try again, LOL

    OMG, I will age 10 years if I don't get this right.

    Here we go again.

    Will take a photo with my iPhone and post it.

  • by Loner T,

    Loner T Loner T May 31, 2015 4:02 PM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 31, 2015 4:02 PM in response to alberto.benamu

    There is a utility called GPT Fdisk - http://sourceforge.net/projects/gptfdisk/ . Please download it on the OS X side when you get a chance.

     

    I will give you the exact steps once I see the message.

  • by alberto.benamu,

    alberto.benamu alberto.benamu May 31, 2015 4:30 PM in response to Loner T
    Level 1 (8 points)
    May 31, 2015 4:30 PM in response to Loner T

    This is the error I get..

     

    IMG_0259.JPG

    I already installed GPT Fdisk, thanks

  • by Loner T,

    Loner T Loner T May 31, 2015 4:40 PM in response to alberto.benamu
    Level 7 (24,800 points)
    Safari
    May 31, 2015 4:40 PM in response to alberto.benamu

    In Step 10, 'Y' is used for an existing installation. You need to test the installation with 'Y' and 'N', because I do not know what state the NVRAM is in.


    Please stop if you see any error messages. Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers.


    1. Sudo gdisk /dev/disk1
    2. P  (Print list of parts)
    3. R  (Recover)
    4. O (print current Hybrid MBR)
    5. H (chooses Hybrid)
    6. Partitions numbers to be hybridized: 2 3 4
    7. Y  (Good for GRUB question)
    8. N  (part 2 boot flag)
    9. N  (part 3 boot flag)
    10. Y  (part 4 boot flag make NTFS bootable partition)
    11. O  (print current Hybrid MBR)
    12. W (Write the new MBR)
    13. Y (Yes! write the new MBR)
    14. Reboot

     

    Here is sample Q&A for this section. Please notice the Press Enter/Return.

     

    Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

     

    Creating entry for GPT partition #2 (MBR partition #2)

    Enter an MBR hex code (default AF): Press Enter/Return

    Set the bootable flag? (Y/N): N

     

    Creating entry for GPT partition #3 (MBR partition #3)

    Enter an MBR hex code (default AB): Press Enter/Return

    Set the bootable flag? (Y/N): N

     

    Creating entry for GPT partition #4 (MBR partition #4)

    Enter an MBR hex code (default 07): Press Enter/Return

    Set the bootable flag? (Y/N): Y

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