Q: Windows BootCamp Partition gone after Yosemite Upgrade

Thanks Loner T

While trying to solve this I accidentally ran the sudo dd command and I believe the data on disk04 was rewritten as a different partition. I ran this command

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

and when I ran diskutil list this is what I got

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage                         499.2 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           *498.9 GB   disk1

                                 Logical Volume on disk0s2

                                 8DB16C7D-E00D-47A2-B442-946D1404A942

                                 Unencrypted

/dev/disk2

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *1.0 TB     disk2

   1:                        EFI EFI                     209.7 MB   disk2s1

   2:                  Apple_HFS MBPBackup#1             999.8 GB   disk2s2

the disk2 above is the backup drive, as you can see the label, but the disk1 was created just now. Whats the solution for this?

I will post the results of the commands you asked for windows in a while

Thanks

I used the dd command just as I had posted in the earlier query. I did not use the "of" qualifier. You might be right this is the partition created by the Yosemite update. As you might have guessed the Windows problem is on another mac, which is basically used for my office work.

Do you recommend restarting the system on which I ran the dd command?

I will post the results of the commands you have asked for the windows problem shortly.

Thanks a ton for this help

Hi Loner T

Here are the results of the commands. Sorry it took so long. I had to get the system from my office and it has taken a while

 

Edifices-MBP:~ edificedesign$ diskutil list

 

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *250.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MAC 125 GB partition    50.3 GB    disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data                         125.0 GB   disk0s4

/dev/disk2

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                                                   *125.0 GB   disk2

Edifices-MBP:~ edificedesign$ diskutil cs list

No CoreStorage logical volume groups found

Edifices-MBP:~ edificedesign$ sudo gpt -vv -r show /dev/disk0

Password:

Sorry, try again.

Password:

gpt show: /dev/disk0: mediasize=250059350016; sectorsize=512; blocks=488397168

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

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

gpt show: /dev/disk0: Sec GPT at sector 488397167

      start       size  index  contents

          0          1         MBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

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

     409640   98244072      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

   98653712    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

   99923248  144333520        

  244256768  244140032      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  488396800        335        

  488397135         32         Sec GPT table

  488397167          1         Sec GPT header

Edifices-MBP:~ edificedesign$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 30401/255/63 [488397168 sectors]

Signature: 0xAA55

         Starting       Ending

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

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

1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] <Unknown ID>

2: AF 1023 254  63 - 1023 254  63 [    409640 -   98244072] HFS+       

3: AB 1023 254  63 - 1023 254  63 [  98653712 -    1269536] Darwin Boot

*4: 07 1023 254  63 - 1023 254  63 [ 244256768 -  244140032] HPFS/QNX/AUX

Thanks

h

Hi Loner T

Yes, the problem seems to be between #3 and #4. I do not know what kind of modifications did the user of that system did. I am not aware of that and there is no way to confirm it with him.

Can you run me through the process of using TestDisk and gdisk? I have not used them before. Do I first use TestDisk and later gdisk to modify the partition? I read the reference post and in it you have started in step 1 by using gdisk to delete and later modify the partition number #4. It would be much appreciated if you give me a brief step breakdown

Thanks

Thanks a lot Loner T. I'll run through these steps and let you know