I was trying to create bootable USB media in Boot Camp Assistant. Had a small USB plugged in and my HDD. Upon formatting I think my partition table screwed up. I had 2 partitions. 1.2TB NTFS and 0.8TB exFAT. Immediately I ran diskutil and gpt which show:

$ gpt show
       start        size  index  contents
           0           1         MBR
           1          62
          63  2344529857      1  MBR Part 7
  2344529920  1562497024      2  MBR Part 7
  3907026944        2220

diskutil (I already tried to fix using gpt add - causing both partitions to read NTFS):

$ diskutil list
/dev/disk1 (external, physical):
   #:                   TYPE NAME               SIZE      IDENTIFIER
   0: FDisk_partition_scheme                   *2.0 TB    disk1
   1:           Windows_NTFS                    1.2 TB    disk1s1
   1:           Windows_NTFS                    800.0 GB  disk1s2

I tried to recover it using gpt add and made the GUID NTFS for both. They wouldnt mount.


I then tried pdisk and completely ruined my partition table.


Is there a way i can get my partitions back? After pdisk my gpt show now reads:

$ gpt show
       start         size  index  contents
           0   3907029164

and diskutil reads:

$ diskutil list
/dev/disk2 (external, physical):
   #:                   TYPE NAME               SIZE      IDENTIFIER
   0:                                          *2.0 TB    disk2

Am I screwed? I havent written to the HD. I know my files and partitions are still there. I just need help fixing this.

(p.s. currently using testdisk and scanning as an INTEL drive).

  • In the first three screenshots you are maltreating disk1, in the last three disk2! ??? Also, pdisk is a tool to partition disks with the Apple Partition Map scheme which is rather old (and inappropriate here)! The proper tool for MBR disks is fdisk.
    – klanomath
    Mar 26, 2018 at 14:23
  • yeah it changed disk number during all my mucking about which was strange. Testdisk quick scan couldnt find the parts so doing deeper scan. Im now preparing for the worst. Mar 26, 2018 at 20:37
  • If you provide/allow remote access i may have look. Related: apple.stackexchange.com/a/309948/93229 another: apple.stackexchange.com/questions/309863/…
    – klanomath
    Mar 26, 2018 at 20:40
  • That sounds great. how do i allow remote access? Mar 27, 2018 at 9:09
  • You have to download TeamViewer (currently TV 12 is installed here - AFAIK the latest version TV 13 doesn't allow access for TV 12 clients - so you have to download, install and configure an older version teamviewer.com/en/download/previous-versions). Root access and a tool (e.g. wxHexEditor) are required in your environment. The TeamViewer credentials have to be sent to klanomath(at)googlemail.com.
    – klanomath
    Mar 27, 2018 at 9:14

1 Answer 1


Given that this is about data loss on a windows-formatted disk, you might want to ask in a windows-centric place. It sounds to me like data recovery (deleted file scans) would be your only hope.

I'm not clear, did you have a USB thumb drive and a 2 TB USB HDD plugged in, and picked the wrong one for making the Bootcamp tools?

  • The reason for my initial posting here was that I am using osx and it is an issue I need resolved using osx. I had a somewhat similar issue before where my partition table of my mac hdd had corrupted and was fixed manually using gpt. To answer storage media, I'm using a 2TB HDD formatted in paragon partition manager. 1 NTFS part and 1 exFAT part. I had ALSO plugged in a thumb drive to create a bootable media using bootcamp assistant. I had selected the right USB to create the bootable media, however, ALL USB devices freaked out and my HDD was left corrupted. Mar 26, 2018 at 12:38
  • Data recovery might be my best option, however i know that my info is still there and perfectly in tact, I Just need to find the right sectors and rebuild the drive partition map. Mar 26, 2018 at 12:39
  • You have the partition information. Have you tried using fdisk to reenter the MBR partition values? Mar 27, 2018 at 8:41
  • I will do that. Just dont know the commands to do it. Mar 27, 2018 at 9:16
  • Could I get some assistance please? THANKS! :) Mar 27, 2018 at 9:16

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