bob_silicon

Q: Cannot boot to windows 7 after canceling bootcamp backup

Im running win7 x64 and OS X on MacBook air. Yesterday i made regular bootcamp back-up. When back-up is processing, i cancel it. After that, i cant boot to win7.


Results of the “sudo gpt -r -vv show disk0”

webwxgetmsgimg.jpg


Results of the “sudo fdisk /dev/disk0”

webwxgetmsgimg (2).jpg


Is there any recommendation? thank you

MacBook Air, Mac OS X (10.5.1)

Posted on Aug 15, 2014 8:38 PM

Close

Q: Cannot boot to windows 7 after canceling bootcamp backup

  • All replies
  • Helpful answers

Page 1 of 4 last Next
  • by Loner T,

    Loner T Loner T Aug 16, 2014 2:44 AM in response to bob_silicon
    Level 7 (24,312 points)
    Safari
    Aug 16, 2014 2:44 AM in response to bob_silicon

    The 'backup' tool seems to have modified your GPT#4 entry and obliterated your MBR. What type of a tool is this?

  • by bob_silicon,

    bob_silicon bob_silicon Aug 16, 2014 7:51 AM in response to Loner T
    Level 1 (0 points)
    Aug 16, 2014 7:51 AM in response to Loner T

    I back up mac with time machine.

    Is it possible to reboot win7, thera are very important files in it. thank you

  • by Loner T,Helpful

    Loner T Loner T Aug 16, 2014 8:04 AM in response to bob_silicon
    Level 7 (24,312 points)
    Safari
    Aug 16, 2014 8:04 AM in response to bob_silicon

    TM should not modify any partitioning information, unless a restore was attempted instead of a backup. Are you certain it was a backup? Also the long number after GPT and a number is the same for entries 2 and 4, which indicates a HFS+ file system.

     

    Can you post the output of diskutil list command?

     

    In the Console logs, can you look for backup messages and check what happened?

     

    We can attempt recovery once it is known what happened?

  • by bob_silicon,

    bob_silicon bob_silicon Aug 16, 2014 8:51 AM in response to Loner T
    Level 1 (0 points)
    Aug 16, 2014 8:51 AM in response to Loner T

    Results of comman "diskutil list"

    webwxgetmsgimg_diskutil list.jpg

  • by Loner T,

    Loner T Loner T Aug 16, 2014 9:02 AM in response to bob_silicon
    Level 7 (24,312 points)
    Safari
    Aug 16, 2014 9:02 AM in response to bob_silicon

    Can you run

     

    sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

  • by bob_silicon,

    bob_silicon bob_silicon Aug 16, 2014 9:47 AM in response to Loner T
    Level 1 (0 points)
    Aug 16, 2014 9:47 AM in response to Loner T

    the results of comman "dd",

    can you tell me the use of this command is ???

    webwxgetmsgimg _dd.jpg

  • by Loner T,Helpful

    Loner T Loner T Aug 16, 2014 4:51 PM in response to bob_silicon
    Level 7 (24,312 points)
    Safari
    Aug 16, 2014 4:51 PM in response to bob_silicon

    The purpose is to dump the first block of the NTFS header to see if the file system is intact.

     

    You may need to download Testdisk to look for deleted partitions.

  • by bob_silicon,

    bob_silicon bob_silicon Aug 17, 2014 7:09 AM in response to Loner T
    Level 1 (0 points)
    Aug 17, 2014 7:09 AM in response to Loner T

    thank you for your help.

    The results of "dd" are all zero.  Does it mean the file system is not intact or win7 partition is deleted?

    I have download Testdisk for mac,but i am not sure i can use it correctly.

    Tomorrow , I'll be on business for a couple of days.  I'll continue to solve this problem after a week

     

     

  • by Loner T,

    Loner T Loner T Aug 17, 2014 7:37 AM in response to bob_silicon
    Level 7 (24,312 points)
    Safari
    Aug 17, 2014 7:37 AM in response to bob_silicon

    When you get back, there is a step-by-step for partition recovery which you may want to look at .

  • by bob_silicon,

    bob_silicon bob_silicon Sep 5, 2014 7:39 PM in response to Loner T
    Level 1 (0 points)
    Sep 5, 2014 7:39 PM in response to Loner T

    I have already come back,  can you tell me where i can find a step-by-step user guide?

    thank you

  • by Loner T,

    Loner T Loner T Sep 5, 2014 7:58 PM in response to bob_silicon
    Level 7 (24,312 points)
    Safari
    Sep 5, 2014 7:58 PM in response to bob_silicon

    This is the step-by-step guide - http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step

     

    Due to issues with Apple Discussions forum, the screen shots you posted are no longer visible in this thread.

     

    Can you post text versions of the output of the following? You can use cut-and-paste. Please remove any personal information as you see fit.

     

    1. diskutil list

    2. sudo gpt -vv -r show /dev/"Bootcampdisk" (replace the string "Bootcampdisk" with disk0, disk1, disk2, etc.).

    3. sudo fdisk /dev/"Bootcampdisk"

    4. sudo dd if=/dev/r"Bootcampdisk" count=1 2>/dev/null | hexdump -C (please notice the "r" before the "Bootcampdisk" name).

     

    This will allow information to be recorded here before any changes are made.

  • by bob_silicon,

    bob_silicon bob_silicon Sep 6, 2014 7:26 PM in response to Loner T
    Level 1 (0 points)
    Sep 6, 2014 7:26 PM in response to Loner T

    The output of "diskutil list"

    applematoMacBook-Air:~ apple$ diskutil list

    /dev/disk0

       #:                       TYPE NAME                       SIZE         IDENTIFIER

       0:      GUID_partition_scheme                       *251.0 GB   disk0

       1:                        EFI                                   209.7 MB   disk0s1

       2:                  Apple_HFS Macbook-air          125.0 GB   disk0s2

       3:                 Apple_Boot Recovery HD         650.0 MB   disk0s3

       4:                  Apple_HFS BOOTCAMP        125.0 GB   disk0s4

  • by bob_silicon,

    bob_silicon bob_silicon Sep 6, 2014 7:33 PM in response to bob_silicon
    Level 1 (0 points)
    Sep 6, 2014 7:33 PM in response to bob_silicon

    the output of command sudo gpt -vv -r show /dev/"disk0"

    applematoMacBook-Air:~ apple$ sudo gpt -vv -r show /dev/"disk0"

    gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

    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 490234751

          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  244140624      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

      244550264    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      245819800       1640        

      245821440  244151128      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

      489972568     262151        

      490234719         32         Sec GPT table

      490234751          1         Sec GPT header

  • by bob_silicon,

    bob_silicon bob_silicon Sep 6, 2014 7:41 PM in response to bob_silicon
    Level 1 (0 points)
    Sep 6, 2014 7:41 PM in response to bob_silicon

    the output of sudo gpt -vv -r show /dev/"disk0s1"

    applematoMacBook-Air:~ apple$ sudo gpt -vv -r show /dev/"disk0s1"

    gpt show: /dev/disk0s1: mediasize=209715200; sectorsize=512; blocks=409600

    gpt show: /dev/disk0s1: MBR at sector 0

       start    size  index  contents

           0       1         MBR

           1  409599        

Page 1 of 4 last Next