SHGD
Level 1 (8 points)
Mac OS X

Q: No partition possible for reinstallation of El Capitan

I have major problems on both OS X and win 7 (imac 2009).

The computer is unusable, especially the keyboard. This follows an update to El Capitan a couple of weeks ago.

 

The computer does not boot with any keys (keyboard problems), the only start up disk available is bootcamp, but OS X and recovery disks are visible on win 7 in bootcamp console.

I tried reinstalling El Capitan but no disks are available for partition, so i'm blocked (needs to be GUID which I don't have).

 

I have saved all files and would really like to restore systems. However, the dvd is not working (ejects) for both OSX installation DVD or win 7 iso burnt dvd.

I'm wondering if the this is repairable ? Thanks in adavnce for any advice.

iMac, OS X El Capitan (10.11.6)

Posted on Aug 29, 2016 1:16 AM

by Loner T,Solvedanswer
Loner T Loner T
Level 7 (23,493 points)
Safari
A:

Your GPT is invalid, and your MBR is very much out of order. You need GPT Fdisk to correct this. Let me know once you have it installed, and I can provide the exact steps to correct this. It will also address your Windows issues.

Posted on Sep 2, 2016 1:18 PM

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SHGD

Q: No partition possible for reinstallation of El Capitan

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  • by Loner T,Helpful

    Loner T Loner T Sep 2, 2016 12:32 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 12:32 PM in response to SHGD

    In Applications -> Utilities you have a screen grab utility called Grab. You may want to use that  and post a screen shot.

     

    From OSX Terminal, is it possible to post a screen shot of the following command.

     

    diskutil list

  • by SHGD,

    SHGD SHGD Sep 2, 2016 12:41 PM in response to Loner T
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 12:41 PM in response to Loner T

    No screen shot (must be tired). Hère is the text :

     

    Last login: Fri Sep  2 21:34:10 on ttys000

    pc54:~ stuarthallett$ DISKUTIL LIST

    /dev/disk0 (internal, physical):

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     FDisk_partition_scheme                        *1.0 TB     disk0

       1:               Windows_NTFS BOOTCAMP                325.7 GB   disk0s1

       2:                  Apple_HFS Macintosh HD            673.5 GB   disk0s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

       4:               Windows_NTFS Réservé au système      104.9 MB   disk0s4

    pc54:~ stuarthallett$ /Applications/Utilities/Grab.app

  • by Loner T,

    Loner T Loner T Sep 2, 2016 12:48 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 12:48 PM in response to SHGD

    From OSX Terminal, please post the output of

     

    sudo gpt -vv -r show /dev/disk0

    sudo fdisk /dev/disk0

    sudo dd if=/dev/rdisk0s1 count=1 2>/dev/null | hexdump -C

     

    These commands will prompt you for your password.

     

    Was Windows Disk Management used to manipulate any partitions? The 104MB partition is a Windows EFI partition.

    The current layout is not a good one for OSX and Windows. Was there a second disk in the system in the past?

     

    Please download and install GPT Fdisk - https://sourceforge.net/projects/gptfdisk/ .

  • by SHGD,

    SHGD SHGD Sep 2, 2016 1:06 PM in response to Loner T
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 1:06 PM in response to Loner T

    The 104MB appeared after the previous problems following El capitan upgrade. Since then i have bootcamp disk and 104MB disk on desktop.

     

    Here is sudo gît -vv -r show /dev/disk0 results:

     

    Last login: Fri Sep  2 21:37:30 on ttys000

    pc54:~ stuarthallett$ sudo gpt -vv -r show /dev/disk0

     

    We trust you have received the usual lecture from the local System

    Administrator. It usually boils down to these three things:

     

        #1) Respect the privacy of others.

        #2) Think before you type.

        #3) With great power comes great responsibility.

     

    Password:

    Sorry, try again.

    Password:

    gpt show: /dev/disk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168

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

    gpt show: /dev/disk0: Bad CRC in GPT table at sector 2

    gpt show: /dev/disk0: Sec GPT at sector 1953525167

           start        size  index  contents

               0           1         MBR

               1      409639        

          409640  1315481784      2  MBR part 175

      1315891424     1269536      3  MBR part 171

      1317160960      204800      4  MBR part 7

      1317365760   636155904      1  MBR part 7

      1953521664        3471        

      1953525135          32         Sec GPT table

      1953525167           1         Sec GPT header

    pc54:~ stuarthallett$ /Applications/Utilities/Grab.app

  • by SHGD,

    SHGD SHGD Sep 2, 2016 1:08 PM in response to SHGD
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 1:08 PM in response to SHGD

    sudo fdisk /dev/disk0

     

    Last login: Fri Sep  2 21:55:54 on ttys000

    pc54:~ stuarthallett$ sudo fdisk /dev/disk0

    Password:

    Disk: /dev/disk0 geometry: 121601/255/63 [1953525168 sectors]

    Signature: 0xAA55

             Starting       Ending

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

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

    1: 07 1023 254  63 - 1023 254  63 [1317365760 -  636155904] HPFS/QNX/AUX

    2: AF   25 127  15 - 1023 254  63 [    409640 - 1315481784] HFS+       

    3: AB 1023 254  63 - 1023 254  63 [1315891424 -    1269536] Darwin Boot

    *4: 07 1023 254  63 - 1023 254  63 [1317160960 -     204800] HPFS/QNX/AUX

    pc54:~ stuarthallett$

  • by Loner T,Solvedanswer

    Loner T Loner T Sep 2, 2016 1:18 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 1:18 PM in response to SHGD

    Your GPT is invalid, and your MBR is very much out of order. You need GPT Fdisk to correct this. Let me know once you have it installed, and I can provide the exact steps to correct this. It will also address your Windows issues.

  • by SHGD,

    SHGD SHGD Sep 2, 2016 1:18 PM in response to SHGD
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 1:18 PM in response to SHGD

    sudo dd if=/dev/rdisk0s1 count=1 2>/dev/null | hexdump -C

    Last login: Fri Sep  2 22:08:32 on ttys000

    pc54:~ stuarthallett$ sudo dd if=/dev/rdisk0s1 count=1 2>/dev/null | hexdump -C

    00000000  eb 52 90 4e 54 46 53 20  20 20 20 00 02 08 00 00  |.R.NTFS    .....|

    00000010  00 00 00 00 00 f8 00 00  3f 00 ff 00 00 68 85 4e  |........?....h.N|

    00000020  00 00 00 00 80 00 80 00  ff f7 ea 25 00 00 00 00  |...........%....|

    00000030  00 00 0c 00 00 00 00 00  02 00 00 00 00 00 00 00  |................|

    00000040  f6 00 00 00 01 00 00 00  5b 98 f9 50 d9 f9 50 7e  |........[..P..P~|

    00000050  4c ad 4a b4 fa 33 c0 8e  d0 bc 00 7c fb 68 c0 07  |L.J..3.....|.h..|

    00000060  1f 1e 68 66 00 cb 88 16  0e 00 66 81 3e 03 00 4e  |..hf......f.>..N|

    00000070  54 46 53 75 15 b4 41 bb  aa 55 cd 13 72 0c 81 fb  |TFSu..A..U..r...|

    00000080  55 aa 75 06 f7 c1 01 00  75 03 e9 dd 00 1e 83 ec  |U.u.....u.......|

    00000090  18 68 1a 00 b4 48 8a 16  0e 00 8b f4 16 1f cd 13  |.h...H..........|

    000000a0  9f 83 c4 18 9e 58 1f 72  e1 3b 06 0b 00 75 db a3  |.....X.r.;...u..|

    000000b0  0f 00 c1 2e 0f 00 04 1e  5a 33 db b9 00 20 2b c8  |........Z3... +.|

    000000c0  66 ff 06 11 00 03 16 0f  00 8e c2 ff 06 16 00 e8  |f...............|

    000000d0  4b 00 2b c8 77 ef b8 00  bb cd 1a 66 23 c0 75 2d  |K.+.w......f#.u-|

    000000e0  66 81 fb 54 43 50 41 75  24 81 f9 02 01 72 1e 16  |f..TCPAu$....r..|

    000000f0  68 07 bb 16 68 70 0e 16  68 09 00 66 53 66 53 66  |h...hp..h..fSfSf|

    00000100  55 16 16 16 68 b8 01 66  61 0e 07 cd 1a 33 c0 bf  |U...h..fa....3..|

    00000110  28 10 b9 d8 0f fc f3 aa  e9 5f 01 90 90 66 60 1e  |(........_...f`.|

    00000120  06 66 a1 11 00 66 03 06  1c 00 1e 66 68 00 00 00  |.f...f.....fh...|

    00000130  00 66 50 06 53 68 01 00  68 10 00 b4 42 8a 16 0e  |.fP.Sh..h...B...|

    00000140  00 16 1f 8b f4 cd 13 66  59 5b 5a 66 59 66 59 1f  |.......fY[ZfYfY.|

    00000150  0f 82 16 00 66 ff 06 11  00 03 16 0f 00 8e c2 ff  |....f...........|

    00000160  0e 16 00 75 bc 07 1f 66  61 c3 a0 f8 01 e8 09 00  |...u...fa.......|

    00000170  a0 fb 01 e8 03 00 f4 eb  fd b4 01 8b f0 ac 3c 00  |..............<.|

    00000180  74 09 b4 0e bb 07 00 cd  10 eb f2 c3 0d 0a 45 72  |t.............Er|

    00000190  72 65 75 72 20 6c 65 63  74 75 72 65 20 64 69 73  |reur lecture dis|

    000001a0  71 75 65 00 0d 0a 42 4f  4f 54 4d 47 52 20 61 62  |que...BOOTMGR ab|

    000001b0  73 65 6e 74 00 0d 0a 42  4f 4f 54 4d 47 52 20 63  |sent...BOOTMGR c|

    000001c0  6f 6d 70 72 65 73 73 82  00 0d 0a 43 74 72 6c 2b  |ompress....Ctrl+|

    000001d0  41 6c 74 2b 53 75 70 70  72 20 70 6f 75 72 20 72  |Alt+Suppr pour r|

    000001e0  65 64 82 6d 61 72 72 65  72 0d 0a 00 6f 20 72 65  |ed.marrer...o re|

    000001f0  73 74 61 72 74 0d 0a 00  8c a4 b5 c9 00 00 55 aa  |start.........U.|

    00000200

    pc54:~ stuarthallett$

  • by Loner T,

    Loner T Loner T Sep 2, 2016 1:19 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 1:19 PM in response to SHGD

    Good to see a proper NTFS header.

  • by SHGD,

    SHGD SHGD Sep 2, 2016 1:25 PM in response to Loner T
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 1:25 PM in response to Loner T

    Is that some good news at least

  • by Loner T,

    Loner T Loner T Sep 2, 2016 1:29 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 1:29 PM in response to SHGD

    Once the new GPT and MBR are created, the Mac should work properly.

  • by SHGD,

    SHGD SHGD Sep 2, 2016 1:33 PM in response to Loner T
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 1:33 PM in response to Loner T

    Sounds very promising. How do i create a new GPT and MBR, please

  • by Loner T,

    Loner T Loner T Sep 2, 2016 1:35 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 1:35 PM in response to SHGD

    If you have installed GPT Fdisk, then I can provide the exact steps.

  • by SHGD,

    SHGD SHGD Sep 2, 2016 1:39 PM in response to Loner T
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 1:39 PM in response to Loner T

    I have installed GPT disk on mac hd disk, not sure how to run it.

  • by Loner T,

    Loner T Loner T Sep 2, 2016 2:17 PM in response to SHGD
    Level 7 (23,493 points)
    Safari
    Sep 2, 2016 2:17 PM in response to SHGD

    The following steps create a new GPT and overwrite the current MBR. GPT Fdisk (Gdisk) uses single character commands. The text in parentheses is for explanation purposes.

     

    sudo gdisk /dev/disk0

    o (Create a blank GPT)

    x (Experts Menu)

    l (Character 'L' - set sector alignment)

    1 (digit 1 - set alignment to 1 sector)

    m (Main Menu)

    n (New)

    1 (Partition 1)

    40 (Start)

    409600 (End)

    EF00 (EFI)

    n (New)

    2 (Partition 2)

    409640 (Start)

    +1315481784 ( Use '+' for size - End)

    AF00 (HFS+ - OSX Partition)

    n (New)

    3 (Partition 3)

    1315891424 (Start)

    +1269536 ( Use '+' for size - End)

    AB00 (Recovery HD)

    n (New)

    4 (Partition 4)

    1317365760 (Start)

    +636155904 ( Use '+' for size - End)

    0700 (Bootcamp)

    p (Print)

    w (Write)

    y (Confirm write)

    q (Quit Gdisk)

     

    Reboot. Test for OSX boot. Check if the Windows partition is visible in Finder and you can see Windows files.

     

    Once this is tested, we will re-create the MBR as the next step. Please check the values to ensure there are no values which are incorrect.

  • by SHGD,

    SHGD SHGD Sep 2, 2016 2:22 PM in response to Loner T
    Level 1 (8 points)
    Mac OS X
    Sep 2, 2016 2:22 PM in response to Loner T

    Sorry for silly questions but all these commands must be typed in TERMINAL or another place

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