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Old Dec 8, 2013, 12:51 PM   #251
ay0503
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reply

gpt show: disk0: mediasize=250059350016; sectorsize=512; blocks=488397168
gpt show: disk0: PMBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 488397167
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 486717952 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
487127592 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
488397128 7
488397135 32 Sec GPT table
488397167 1 Sec GPT header
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Old Dec 8, 2013, 01:25 PM   #252
murphychris
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Quote:
Originally Posted by isidoros View Post
Hello guys, I'm new here and I've googled and read and read to no avail.. I couldn't find anything to help me.. Any advice would be much appreciated
I don't think I was notified of this post or I'm pretty sure I would have replied. Anyway, let me know if you're still having the problem or if you just went ahead and blew everything away and restored from backups. The GPT and MBR in your case look in sync, so chances are you'd have to go down the testdisk path to find the true start/end sector value for Bootcamp.

----------

Quote:
Originally Posted by ay0503 View Post
gpt show: disk0: mediasize=250059350016;
Do you have a question? The partition map doesn't imply one by itself.
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Old Feb 2, 2014, 10:41 AM   #253
audaciousnomad
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Join Date: Feb 2014
Cool Same problem as someone earlier: bootcamp disappeared after power failure

Hi Chris,

Thanks so much for being a lifesaver to so many users here. I too have unfortunately encountered the deadly "disappearing bootcamp partition" issue.

I'm not sure how it happened, although there was a recent Windows Update applied, and also a spontaneous reboot.

I compared my gpt outputs with others you have helped, and it all seems alright(you're probably a better judge) other than somehow the bootcamp partition went from being formatted as FAT32 to now HPFS?

Could you kindly take a look and let me know what your trained eyes tell you about my forlorn installation? (And what my options are to recover)


Code:
marvmac:~ marvin$ sudo gpt -r -vv show disk0
Password:
gpt show: disk0: mediasize=251000193024; sectorsize=512; blocks=490234752
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 490234751
      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  332031264      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  332440904    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  333710440        920         
  333711360  156522496      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  490233856        863         
  490234719         32         Sec GPT table
  490234751          1         Sec GPT header
marvmac:~ marvin$ sudo gdisk -l /dev/disk0
sudo: gdisk: command not found
marvmac:~ marvin$ sudo fdisk/dev/disk0
sudo: fdisk/dev/disk0: command not found
marvmac:~ marvin$ sudo gdisk -l /dev/disk0
GPT fdisk (gdisk) version 0.8.8

Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with hybrid MBR; using GPT.
Disk /dev/disk0: 490234752 sectors, 233.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 4B78CACD-199A-4A26-B8EE-F56F01F02914
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 490234718
Partitions will be aligned on 8-sector boundaries
Total free space is 1789 sectors (894.5 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       332440903   158.3 GiB   AF00  Customer
   3       332440904       333710439   619.9 MiB   AB00  Recovery HD
   4       333711360       490233855   74.6 GiB    0700  BOOTCAMP
marvmac:~ marvin$ sudo fdisk/dev/disk0
sudo: fdisk/dev/disk0: command not found
marvmac:~ marvin$ sudo fdisk /dev/disk0
Disk: /dev/disk0	geometry: 30515/255/63 [490234752 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 -  332031264] HFS+        
 3: AB 1023 254  63 - 1023 254  63 [ 332440904 -    1269536] Darwin Boot 
*4: 07 1023 254  63 - 1023 254  63 [ 333711360 -  156522496] HPFS/QNX/AUX
marvmac:~ marvin$ sudo gpt -r -vv show disk0
Password:
gpt show: disk0: mediasize=251000193024; sectorsize=512; blocks=490234752
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 490234751
      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  332031264      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  332440904    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  333710440        920         
  333711360  156522496      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  490233856        863         
  490234719         32         Sec GPT table
  490234751          1         Sec GPT header
marvmac:~ marvin$ sudo gdisk -l /dev/disk0
GPT fdisk (gdisk) version 0.8.8

Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with hybrid MBR; using GPT.
Disk /dev/disk0: 490234752 sectors, 233.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 4B78CACD-199A-4A26-B8EE-F56F01F02914
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 490234718
Partitions will be aligned on 8-sector boundaries
Total free space is 1789 sectors (894.5 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       332440903   158.3 GiB   AF00  Customer
   3       332440904       333710439   619.9 MiB   AB00  Recovery HD
   4       333711360       490233855   74.6 GiB    0700  BOOTCAMP
marvmac:~ marvin$ sudo fdisk /dev/disk0
Disk: /dev/disk0	geometry: 30515/255/63 [490234752 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 -  332031264] HFS+        
 3: AB 1023 254  63 - 1023 254  63 [ 332440904 -    1269536] Darwin Boot 
*4: 07 1023 254  63 - 1023 254  63 [ 333711360 -  156522496] HPFS/QNX/AUX
marvmac:~ marvin$

Last edited by audaciousnomad; Feb 2, 2014 at 10:43 AM. Reason: Forgot to paste code.
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Old Feb 2, 2014, 01:20 PM   #254
murphychris
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Quote:
Originally Posted by audaciousnomad View Post
I'm not sure how it happened, although there was a recent Windows Update applied, and also a spontaneous reboot.
If the filesystem is dirty it may not be mountable by OS X's limited NTFS support. I'd try booting Windows. Merely booting should clean it up, do a normal reboot back to OS X and it should then be visible again.

Quote:
I compared my gpt outputs with others you have helped, and it all seems alright(you're probably a better judge) other than somehow the bootcamp partition went from being formatted as FAT32 to now HPFS?
Boot Camp Assistant uses partition type code 0x0C and formats it FAT32. When you install Windows, its installer changes the type code to 0x07 and formats it NTFS. So the partition type code is correct and the GPT and MBR look in sync. So your problem is elsewhere.

The 0x07 partition type code is used by multiple volume formats including NTFS, exFAT, QNX and HPFS. The partition type code doesn't really indicate the volume format, it's just a filter so utilities don't look at everything on the disk for something it recognizes.
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Old Feb 2, 2014, 08:46 PM   #255
audaciousnomad
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Join Date: Feb 2014
Quote:
Originally Posted by murphychris View Post
If the filesystem is dirty it may not be mountable by OS X's limited NTFS support. I'd try booting Windows. Merely booting should clean it up, do a normal reboot back to OS X and it should then be visible again.

Boot Camp Assistant uses partition type code 0x0C and formats it FAT32. When you install Windows, its installer changes the type code to 0x07 and formats it NTFS. So the partition type code is correct and the GPT and MBR look in sync. So your problem is elsewhere.

The 0x07 partition type code is used by multiple volume formats including NTFS, exFAT, QNX and HPFS. The partition type code doesn't really indicate the volume format, it's just a filter so utilities don't look at everything on the disk for something it recognizes.
Thanks for the tip Chris. I'm glad to hear my partition and boot information look ok. My dilemma is that neither the windows(bootcamp) partition, nor the recovery partition appear in the startup disk options in sys preferences. Hence, I don't even get the chance to boot windows even when I hold alt/option key while booting.

I thought of maybe installing a third party bootmgr such as rEFInd, but not sure if that's the right tool or if there are simpler options for my case.

What do you think?
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Old Feb 2, 2014, 09:38 PM   #256
murphychris
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Join Date: Mar 2012
Quote:
Originally Posted by audaciousnomad View Post
I don't even get the chance to boot windows even when I hold alt/option key while booting.
The firmware requires three things to be true to show a Windows boot option at the option key startup menu: A hybrid MBR, i.e. one that contains more than one entry; one of the MBR entries other than the first must have active bit set; there must be code in the first 440 bytes of the MBR.

Two of these things are clearly true from your fdisk results. There's no good reason why the first 440 bytes have been zero'd. Is an SSD involved?


Quote:
I thought of maybe installing a third party bootmgr such as rEFInd, but not sure if that's the right tool or if there are simpler options for my case.
I believe rEFInd skips the first 440 bytes boot strap code, and directly executes ntloader in the first sectors of the NTFS volume. So this might be a work around if the only problem is that the MBR bootstrape code is missing or damaged for some reason. But that's a really far work around without knowing what the actual problem is. I'd sooner boot a Windows DVD (or prepared USB stick), and use Windows Startup Repair, or get down and dirty with bootrec.exe which is faster because it skips the scan. It has separate commands to replace the various parts of the boot process, so the first one to try in this case is /FixMbr.
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Old Feb 2, 2014, 10:06 PM   #257
audaciousnomad
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Join Date: Feb 2014
Quote:
Originally Posted by murphychris View Post
The firmware requires three things to be true to show a Windows boot option at the option key startup menu: A hybrid MBR, i.e. one that contains more than one entry; one of the MBR entries other than the first must have active bit set; there must be code in the first 440 bytes of the MBR.

Two of these things are clearly true from your fdisk results. There's no good reason why the first 440 bytes have been zero'd. Is an SSD involved?




I believe rEFInd skips the first 440 bytes boot strap code, and directly executes ntloader in the first sectors of the NTFS volume. So this might be a work around if the only problem is that the MBR bootstrape code is missing or damaged for some reason. But that's a really far work around without knowing what the actual problem is. I'd sooner boot a Windows DVD (or prepared USB stick), and use Windows Startup Repair, or get down and dirty with bootrec.exe which is faster because it skips the scan. It has separate commands to replace the various parts of the boot process, so the first one to try in this case is /FixMbr.
Thanks again Chris. Yes, a SSD drive is indeed installed. This is a Macbook Air mid-2011 edition, running OS X Lion 10.7.5.

Is it correct to say that a windows boot dvd/usbstick loaded by holding C-key down on Mac powerup will load and then recognize only the bootcamp partition on my SSD? Following that, the next step would be to choose option R to repair said partition?

I can try this, just want to make sure I understand your instructions. BTW...Bootcamp Assistant in OS X offers a utility to prepare a Windows Install disk. Do you or do you not recommend using this for the repair?
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Old Feb 2, 2014, 10:20 PM   #258
murphychris
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Quote:
Originally Posted by audaciousnomad View Post
Yes, a SSD drive is indeed installed.
It's rare but there are firmware bugs floating around that fit this description, although it's not specific enough to just hosting the MBR boot code. Usually other data is also corrupted or missing.


Quote:
Is it correct to say that a windows boot dvd/usbstick loaded by holding C-key down on Mac powerup will load and then recognize only the bootcamp partition on my SSD?
Well, doing that merely boots the DVD. The recognition aspect is done either by Windows Startup Repair, or bootrec.exe. You need to choose one of those options.

Quote:
Following that, the next step would be to choose option R to repair said partition?
No. Don't do this. There's nothing wrong with the partitions based on what you've posted. OS X Disk Utility cannot repair NTFS volumes. And more often than not when it tries to repair partition maps it makes things worse so longer the pole you touch Disk Utility with the safer your data will be.

Quote:
Bootcamp Assistant in OS X offers a utility to prepare a Windows Install disk. Do you or do you not recommend using this for the repair?
If it'll let you do that without modifying the partition layout, yes. But I've never tried this. My understanding is that when there's a Boot Camp volume present, Boot Camp Assistant only offers the option to remove the Boot Camp volume which is definitely not what you want to do. I don't have a suggestion for how to create a Windnows bootable USB stick for a Mac if Boot Camp Assistant doesn't provide it exclusively and separate from removing the Boot Camp volume.
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Old Feb 9, 2014, 11:46 AM   #259
elgrecomac
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Location: San Diego
A suggestion for the future

Like others on this thread I have a critically needed bootcamp partition to run MS Project and MS Visio. The smartest thing I've ever done with this environment is to purchase Winclone and backup the bootcamp image with it and store it on an external drive. If anything were to happen with the partition AND I created regular images of the partition, it is a relatively simple process to reformat the bootcamp partition and restore the bootcamp image. Best money I've spent on Windows in many years. I encourage all who use bootcamp to do some investigating about this product.
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Old Mar 3, 2014, 02:08 PM   #260
kcjones391
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Join Date: Mar 2014
Red face

I too have fallen to the Bootcamp - Windows 7 – NTFS disk space issue and wish I had seen this forum before I dug such a deep hole. Before I completely start from scratch in reloading everything and losing some important files I hope someone can help. I am new to this level of sophistication working with GPT and MBR so please forgive my inabilities.

My issues started when someone gave me a computer – no wait that is too far back. Last night I was running low on disk space for the WIN 7 portion of my dual boot on Bootcamp. I had read a bunch of garbage on how you could adjust the partitions in the native OS – first OS X then adjust Windows through disk management. With the new update on OS X (10.9.2) I had lost my rEFInd boot manager and new I needed to reinstall it. So I thought (second mistake) I would adjust the disk partitions before doing that. I have plenty of space on my OS X partition. Well things went from bad to worse and I should have stopped but didn’t and now I am here hoping someone can bail me out. And yes I know I should have backed up the Windows portion but somehow got in my head that the Time Machine function backed up the Bootcamp windows portion also. Needles to say I am in a hurt for some of the files on the windows partition.

I have read most of the threads on this topic and posting just the start of information that murphychris and PerceptorC5 talked about. I am hoping that someone can help direct me; I can push the keys but don’t know the details behind them. So here it goes. In my case OS X works fine but have lost the Windows 7 side.

OS X Partition:

Mount Point : / Capacity : 875.53 GB (875,527,491,584 Bytes)
Format : Mac OS Extended (Journaled) Available : 516.21 GB (516,212,191,232 Bytes)
Owners Enabled : Yes Used : 359.32 GB (359,315,300,352 Bytes)
Number of Folders : 313,455 Number of Files : 1,330,511

NTFS Partition:

Mount Point : Not mounted Capacity : 107.71 GB (107,713,921,024 Bytes)
Format : MS-DOS (FAT) Available : -
Owners Enabled : - Used : -
Number of Folders : - Number of Files : -

Code:
sudo gpt -r -vv show disk0

gpt show: disk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 1953525167
       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  1710014632      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  1710424272     1126880      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  1711551152    31593808         
  1743144960   210378752      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  1953523712        1423         
  1953525135          32         Sec GPT table
  1953525167           1         Sec GPT header
Code:
sudo fdisk /dev/disk0

Disk: /dev/disk0	geometry: 121601/255/63 [1953525168 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 - 1710014632] HFS+        
 3: AB 1023 254  63 - 1023 254  63 [1710424272 -    1126880] Darwin Boot 
*4: 07 1023 254  63 - 1023 254  63 [1743144960 -  210378752] HPFS/QNX/AUX
Code:
sudo gdisk -l /dev/disk0

GPT fdisk (gdisk) version 0.8.9

Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with hybrid MBR; using GPT.
Disk /dev/disk0: 1953525168 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 90409A5B-8155-4F62-9015-AAD5E8333F34
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 8-sector boundaries
Total free space is 31595237 sectors (15.1 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640      1710424271   815.4 GiB   AF00  Untitled
   3      1710424272      1711551151   550.2 MiB   AB00  Recovery HD
   4      1743144960      1953523711   100.3 GiB   0700  Untitled
Please help if at all possible.
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Old Mar 17, 2014, 08:09 PM   #261
aseatosufferin
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Join Date: Mar 2014
Unmountable partition

Hello everyone

Once I had a mac partition+bootcamp partition+ a partition which i could see in windows.
I deleted my bootcamp partition and added it to mac partition. Now I have a mac partition and the third partition. third partition is not mountable in disk utility, Its greyed out in the list.
I could recover some of my data from that drive using disk drill but , I still think there would be a way to see the files in original arrangement and folders.

Im not familiar with mac os, its just one week im working with that, and Im not that much expert to use gptdisk or other utilities. I guess partition map of this drive is still MBR as it once was recognizable by windows. it would be great if anybody could help me.
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Old Dec 4, 2014, 09:54 AM   #262
Mithrill
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Join Date: Dec 2014
40 Gt gone after migrating error

Hi everyone.

Found this threat and posting my problem, which is really similar to others. Except mine happened during bootcamp assistant error. So I planned to delete bootcamp partition and install windows7 from scratch.
I launched bootcamp assistant and hit the migrate -button. At this point, I went to prepare some coffee. I came back and there was a error message, something about error while migrating, I don't remember word by word sentence but anyway. Point is, there was a error message on screen. I relaunched bootcamp assistant to re-migrate the bootcamp partition. Program started to run. I waited about 15 min but progress bar never moved. After an hour of waiting, progress bar still hasn't moved, I decided to close bootcamp assistant and restart mac. After reboot, I realized bootcamp partition was gone. I launched disk utility and here is result:



HD capacity is 320 Gt but lower right corner clearly says 284 Gt. So 36 Gt are gone. If I remember correctly, bootcamp size was 40 Gt so that is about the right size.

here are results after doing those sudo-commands:

Code:
sudo gpt -r -vv show disk0

gpt show: disk0: mediasize=320072933376; sectorsize=512; blocks=625142448
gpt show: disk0: PMBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 625142447
      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  555103856      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  555513496    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  556783032   68359383         
  625142415         32         Sec GPT table
  625142447          1         Sec GPT header
Code:
sudo fdisk /dev/disk0

Disk: /dev/disk0	geometry: 38913/255/63 [625142448 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE 1023 254  63 - 1023 254  63 [         1 -  625142447] <Unknown ID>
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused
Code:
sudo gdisk -l /dev/disk0

GPT fdisk (gdisk) version 0.8.10

Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/disk0: 625142448 sectors, 298.1 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 5D7BE9C8-CF7C-4BE9-B5C3-9FFC33857E9B
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 625142414
Partitions will be aligned on 8-sector boundaries
Total free space is 68359389 sectors (32.6 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       555513495   264.7 GiB   AF00  Untitled
   3       555513496       556783031   619.9 MiB   AB00  Recovery HD
If someone can help me to fix this, I would really appreciate that.
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