brianfromtandragee
Level 1 (8 points)
Windows Software

Q: Bootcamp panic

OK guys i have made a big **** up. Basically windows 7 on bootcamp was working fine. I then decided to shrink the bootcamp partition in windows disc management. And the space claim back i was going to use as the second windows simple or logical drive. I followed the wizzard and all my drives turned from blue primaries to light green logicals i think. I knew i was in trouble. Tryed to backstep but to no avail. Now nothing boots without using cmd r. I can see my main disc and the 4 disc partitions greyed out underneath it In disc util.nCan i restore this anyway without losing my mac data. Dont give a stuff about the windows particions. Please help totally scundered

Brian

MacBook Pro, OS X El Capitan (10.11.3)

Posted on Apr 19, 2016 1:12 PM

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brianfromtandragee

Q: Bootcamp panic

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  • by Loner T,

    Loner T Loner T Apr 19, 2016 4:40 PM in response to brianfromtandragee
    Level 7 (24,098 points)
    Safari
    Apr 19, 2016 4:40 PM in response to brianfromtandragee

    Inspect the internal disk for possible recovery options. Your GPT should be corrupt.

     

    Please post the output of the following OS X Terminal commands after you boot from the external disk.

     

    diskutil list

    sudo gpt -vv -r show /dev/disk0

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 2:51 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 2:51 AM in response to Loner T

    OK i can only get Ml due to lack of space on formatted 16gb drive. I have gdisk installed but have no clue how to work it. Can you point me in the right direction please. I wont bail honest

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 3:01 AM in response to brianfromtandragee
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 3:01 AM in response to brianfromtandragee

    ok so after a bit of research I am getting on the terminal window

     

    gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

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

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

          start       size  index  contents

              0          1         MBR

              1  586149887      1  MBR part 66

      586149888  267743232      2  MBR part 66

      853893120  122878000      3  MBR part 66

      976771120       2048

     

    I hope this means something good to all you gurus @Loner T

  • by Loner T,

    Loner T Loner T Apr 20, 2016 6:37 AM in response to brianfromtandragee
    Level 7 (24,098 points)
    Safari
    Apr 20, 2016 6:37 AM in response to brianfromtandragee

    This is as expected. Can you run

     

    sudo gdisk /dev/disk0

     

    It will prompt you about a MBR, a GPT, etc. . You want to pick option 2 - GPT, which will get Gdisk to show the GPT correctly.

     

    Using Windows Disk Management converted this disk to MBR, as shown in the second line of your GPT command output. It also corrupted the CRC, because GPT has a table at both ends of the disk, Gdisk should be able to read the backup table, and show you a GPT. You may see two (or more) spurious entries in the GPT after GPT4, which are meaningless garbage that Disk Management created.

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 7:05 AM in response to brianfromtandragee
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 7:05 AM in response to brianfromtandragee

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     FDisk_partition_scheme                        *500.1 GB   disk0

       1:                Windows_LDM                         300.1 GB   disk0s1

       2:                Windows_LDM                         137.1 GB   disk0s2

       3:                Windows_LDM                         62.9 GB    disk0s3

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *16.0 GB    disk1

       1:                        EFI                         209.7 MB   disk1s1

       2:                  Apple_HFS MacOSX                  15.1 GB    disk1s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 7:10 AM in response to brianfromtandragee
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 7:10 AM in response to brianfromtandragee

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     FDisk_partition_scheme                        *500.1 GB   disk0

       1:                Windows_LDM                         300.1 GB   disk0s1

       2:                Windows_LDM                         137.1 GB   disk0s2

       3:                Windows_LDM                         62.9 GB    disk0s3

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *16.0 GB    disk1

       1:                        EFI                         209.7 MB   disk1s1

       2:                  Apple_HFS MacOSX                  15.1 GB    disk1s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3

    lynns-iphone:~ brianedwards$ sudo gdisk /dev/disk0

    Password:

    GPT fdisk (gdisk) version 1.0.1

     

     

    Caution: invalid backup GPT header, but valid main header; regenerating

    backup header from main header.

     

     

    Caution! After loading partitions, the CRC doesn't check out!

    Warning! Main and backup partition tables differ! Use the 'c' and 'e' options

    on the recovery & transformation menu to examine the two tables.

     

     

    Warning! One or more CRCs don't match. You should repair the disk!

     

     

    Partition table scan:

      MBR: MBR only

      BSD: not present

      APM: not present

      GPT: damaged

     

     

    Found valid MBR and corrupt GPT. Which do you want to use? (Using the

    GPT MAY permit recovery of GPT data.)

    1 - MBR

    2 - GPT

    3 - Create blank GPT

     

     

    Your answer: 2

    Warning! Main partition table overlaps the first partition by 34 blocks!

    You will need to delete this partition or resize it in another utility.

     

     

    Warning! Secondary partition table overlaps the last partition by

    4613656342287589362 blocks!

    You will need to delete this partition or resize it in another utility.

     

     

    Command (? for help):

     

    What do I do now?

  • by Loner T,

    Loner T Loner T Apr 20, 2016 7:44 AM in response to brianfromtandragee
    Level 7 (24,098 points)
    Safari
    Apr 20, 2016 7:44 AM in response to brianfromtandragee

    Please post the output of Gdisk p command. 

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 9:22 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 9:22 AM in response to Loner T

    Disk /dev/disk0: 976773168 sectors, 465.8 GiB

    Logical sector size: 512 bytes

    Disk identifier (GUID): 00000C76-746C-0000-7A43-0000306F0000

    Partition table holds up to 128 entries

    First usable sector is 34, last usable sector is 976773134

    Partitions will be aligned on 8-sector boundaries

    Total free space is 1773 sectors (886.5 KiB)

     

     

    Number  Start (sector)    End (sector)  Size       Code  Name

       1              40          409639   200.0 MiB   EF00  EFI system partition

       2          409640       584878599   278.7 GiB   AF05  Macintosh HD

       3       584878600       586148135   619.9 MiB   AB00  Recovery HD

       4       586149888       976773119   186.3 GiB   0700  BOOTCAMP

      17  18376656804508598272  4613656343264362496   512 bytes   FFFF

      19  4179340454199885824  4179340454202923064   1.4 GiB     FFFF  ࠀ

     

     

    Command (? for help):

     

    Line 17 had a load of chinese characters which would not let me post

  • by Loner T,

    Loner T Loner T Apr 20, 2016 9:53 AM in response to brianfromtandragee
    Level 7 (24,098 points)
    Safari
    Apr 20, 2016 9:53 AM in response to brianfromtandragee

    This is expected. We are going to wipe this GPT and create a new one, using Gdisk and create only the first four entries. Can you use Re: Unable to boot into mac or bootcamp as a reference and the values that you see in the first four(4) entries of your specific output and create a new GPT? The linked thread ha steh same issue as you have.

     

    This should allow you to boot OSX. Once OSX boots from the internal disk, we can fix BOOTCAMP using Gdisk.

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 10:07 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 10:07 AM in response to Loner T

    i an not 100% sure here can you give me a basic step by step. Am i running o in terminal then p then w etc?

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 10:19 AM in response to brianfromtandragee
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 10:19 AM in response to brianfromtandragee

    so if my thinkinngs correct. my terminal entries should be

     

    sudo gdisk /dev/rdisk0


    then at command enter o return

    then p and return etc

    stop and do not do q?

  • by Loner T,

    Loner T Loner T Apr 20, 2016 10:22 AM in response to brianfromtandragee
    Level 7 (24,098 points)
    Safari
    Apr 20, 2016 10:22 AM in response to brianfromtandragee

    Using your values....

     

    Step A - Creates a blank GPT. Choose 2 for GPT, if prompted.

     

    sudo gdisk /dev/rdisk0

    o

    p

    w

    y

    q

     

    Step B. Create individual entries . The text in "(...)" is for informational purpose.

     

    sudo gdisk /dev/rdisk0

    x

    l (This is is lower case L )

    1 (This is digit 1 )

    m (Go to main menu)

    n (New)

    1

    40

    409639

    EF00

    n

    2

    409640

    584878599

    AF05

    n

    3

    584878600

    586148135

    AB00

    n

    4

    586149888

    976773119

    0700

    p

    w

    y

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 10:43 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 10:43 AM in response to Loner T

    man i am so stupid i missed two lines due to being distracted, how do i start from scratch on your last post, was going so well

  • by Loner T,

    Loner T Loner T Apr 20, 2016 11:30 AM in response to brianfromtandragee
    Level 7 (24,098 points)
    Safari
    Apr 20, 2016 11:30 AM in response to brianfromtandragee

    You can type 'q' to quit at a command prompt within Gdisk, or press Control+C to quit Gdisk.

  • by brianfromtandragee,

    brianfromtandragee brianfromtandragee Apr 20, 2016 11:44 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Apr 20, 2016 11:44 AM in response to Loner T

    you are one clever person and i truely thank you. We are up and running again on the internal HD. Now how do i get ride of bootcamp totally, there may be 2 particions in there if you think back to how my problem started by creating an extra partition.

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