jac.mac

Q: MBR/GPT

Hi,

 

Pardon me for posting this as I'm not a IT kind of person (clueless about MBR, GPT etc). I know this topic has been posted here numerous times, but I still cant seem to resolve the problem I'm facing.

 

I'm encountering intermittent incidents where BootCamp becomes unbootable (i.e. it doesnt show up when I press Alt/Option upon booting. Only see OS X and Recovery).

I read through some of the posts here and followed the steps. BootCamp would thereafter be bootable, and then suddenly become unbootable again after some time.

 

Please kindly guide me on how to resolve the partition issues I'm having. If necessary, I can provide my email for you to touch base and perhaps help me out through Teamviewer.

 

Below is the current information of my system (now that Windows is unbootable again):

 

I currently see the following partitions in Disk Utility:

1) OS X (disk0s2)

2) DATA (disk0s4)

3) BOOTCAMP (disk0s5)

 

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 -  490234751] <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   

 

sudo gdisk /dev/disk0

GPT fdisk (gdisk) version 1.0.0

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.

 

sudo gpt -r -vv show disk0

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

gpt show: disk0: PMBR 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         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

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

     409640  195585936      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  195995576    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  197265112        296        

  197265408  116926464      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  314191872     262144        

  314454016  175779840      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  490233856        863        

  490234719         32         Sec GPT table

  490234751          1         Sec GPT header

MacBook Pro with Retina display, OS X Mavericks (10.9.5)

Posted on Apr 16, 2015 10:54 AM

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Q: MBR/GPT

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