Q: GPT help

https://discussions.apple.com/message/26125763#26125763

Output of sudo fdisk /dev/rdisk0 :

Disk: /dev/rdisk0

geometry: 60801/255/63 [976773168 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: 07 1023 254 63 - 1023 254 63 [ 409640 - 469338128] HPFS/QNX/AUX

3: AB 1023 254 63 - 1023 254 63 [ 469747768 - 1269536] Darwin Boot

4: 07 1023 254 63 - 1023 254 63 [ 471017472 - 76855296] HPFS/QNX/AUX

I am using GPT fdisk (or gdisk).

I don't remember all that I've tried to do, but the changes that I had made were: changing the 4th partition's id to 07 (then because of a confusion, the 2nd partition's id to 07). That's it.

MacBook Pro, Mac OS X (10.7)

Posted on Jun 15, 2014 10:24 AM

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Q: GPT help

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by Loner T,

Loner T Jun 15, 2014 11:36 AM in response to Iyassou
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Safari

Jun 15, 2014 11:36 AM in response to Iyassou

Are you using gdisk 0.8.8 or 0.8.9? Christopher has noted an issue that you may want to be aware of.

Can you please post the output of gdisk -> p(rint) (or gpt -vv -r show rdisk0 )?
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by Iyassou,

Iyassou Jun 15, 2014 11:48 AM in response to Loner T
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Jun 15, 2014 11:48 AM in response to Loner T

I am using gdisk 0.8.1.0

Output of gdisk -> p :

Disk /dev/disk0: 976773168 sectors, 465.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): CC23DCF4-ADFD-44F0-94BF-15908E15095C
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 976773134
Partitions will be aligned on 8-sector boundaries
Total free space is 153710781 sectors (73.3 GiB)

Number Start (sector)    End (sector) Size       Code Name
   1              40          409639   200.0 MiB   EF00 EFI System Partition
   2          409640       469747767   223.8 GiB   0700 Customer
   3       469747768       471017303   619.9 MiB   AB00 Recovery HD
   4       471017472       823062527   167.9 GiB   0700 BOOTCAMP
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by Loner T,

Loner T Jun 15, 2014 12:26 PM in response to Iyassou
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Jun 15, 2014 12:26 PM in response to Iyassou

sudo fdisk -e /dev/rdisk0
setpid 2
AF
setpid 4
flag
w

After this, can you run fdisk /dev/rdisk0 and post the output?
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by Iyassou,

Iyassou Jun 15, 2014 12:42 PM in response to Loner T
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Jun 15, 2014 12:42 PM in response to Loner T

After typing setpid 4 I can't type flag : 'flag' is not a valid number.
did I do something wrong?
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by Loner T,

Loner T Jun 15, 2014 1:42 PM in response to Iyassou
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Jun 15, 2014 1:42 PM in response to Iyassou

It may ask you for the type of partition.

sudo fdisk -e /dev/rdisk0
setpid 4
07
flag
w
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by Iyassou,

Iyassou Jun 15, 2014 1:47 PM in response to Loner T
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Jun 15, 2014 1:47 PM in response to Loner T

Pardon me if these are dumb questions or basic knowledge stuff, but: I need to add a partition number after flag, do I put in 07?
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by Loner T,

Loner T Jun 15, 2014 3:13 PM in response to Iyassou
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Jun 15, 2014 3:13 PM in response to Iyassou

flag 04. (I should remember the syntax.)

fdisk: 1> flag ?
Invalid argument: flag <partition number>
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by Iyassou,

Iyassou Jun 16, 2014 12:16 AM in response to Loner T
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Jun 16, 2014 12:16 AM in response to Loner T

Dude!!! I put in flag 04 then pressed w but it told me it needed a reboot. So I rebooted. BUT NOW I CAN'T EVEN BOOT INTO MAC!!!! I'M AT THE WHITE SCREEN WHERE THE APPLE LOGO SHOULD BE ON STARTUP, BUT NOW THERE'S JUST A CROSSED CIRCLE IN THE MIDDLE WITH A SMALL LOADING ICON AT THE BOTTOM!!!
PLEASE TELL ME YOU CAN HELP ME FIX THIS!!!
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by Loner T,

Loner T Jun 16, 2014 3:21 AM in response to Iyassou
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Jun 16, 2014 3:21 AM in response to Iyassou

If you use the Option/ALT key during power-up, what are the options you get?
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by Iyassou,

Iyassou Jun 16, 2014 3:22 AM in response to Loner T
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Jun 16, 2014 3:22 AM in response to Loner T

Macintosh HD and Windows
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by Loner T,

Loner T Jun 16, 2014 3:55 AM in response to Iyassou
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Jun 16, 2014 3:55 AM in response to Iyassou

If you select Macintosh HD, does it boot to MAC OS X correctly?

Did you flag 04 after you did setpid 4 or before? You could have accidentally chosen partition 1, which is your EFI partition. Please be careful.
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by Iyassou,

Iyassou Jun 16, 2014 3:58 AM in response to Loner T
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Jun 16, 2014 3:58 AM in response to Loner T

It doesn't boot correctly: i can't access my login screen!
I did flag 04 after setpid 4
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by Loner T,

Loner T Jun 16, 2014 4:06 AM in response to Iyassou
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Jun 16, 2014 4:06 AM in response to Iyassou

Do you have the ability to boot this machine in Target Disk Mode?

Please see this for what this mode does - http://support.apple.com/kb/PH13842

Do you see a Recovery HD (which is partition #3) when you use Alt/Option key?
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by Iyassou,

Iyassou Jun 16, 2014 5:27 AM in response to Loner T
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Jun 16, 2014 5:27 AM in response to Loner T

I can enter Target Disk Mode but there is no longer the recovery HD partition
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