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All replies
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Helpful answers
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Jan 15, 2016 4:46 AM in response to wykstraby Loner T,Please install OS X on an external disk and boot from it - How to install OS X on an external drive connected to your Mac - Apple Support . Try and use the same version of OS X as you have on the internal disk to avoid issues. You can do this using Internet Recovery - OS X: About OS X Recovery - Apple Support .
Install GPT Fdisk once you have the external disk OS X working - http://sourceforge.net/projects/gptfdisk/ .
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Jan 15, 2016 11:49 AM in response to Loner Tby wykstra,My mac had el capitan but I tried several times to install el capitan on my external USB drive and it got stuck for several hours. I was able to install Mavericks on the drive using another mac laptop I have. What would be my next step ? What do I have to do in GPT Fdisk ?
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Jan 15, 2016 1:12 PM in response to wykstraby Loner T,1. Do you have cables/adapters to use Target Disk Mode - Share files between two computers with target disk mode - Apple Support ?
2. If TDM is not possible, boot the non-working Mac from the USB. I assume you have GPT Fdisk installed on the USB.
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Jan 15, 2016 4:07 PM in response to Loner Tby wykstra,I do not have any cables for target disk mode. I was able to purchase a 1 TB external hard drive and install el capitan on it along with GPT Fdisk. How would I boot into GPT Fdisk now on my computer that needs fixing ? Any commands that I have to execute ?
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Jan 15, 2016 5:11 PM in response to wykstraby Loner T,GPT Fdisk is not a bootable utility. You should execute a SMC/NVRAM reset prior to trying this method.
1. You will need to boot into OS X on the external disk by powering down and powering up, and holding the Alt/Option and selecting the external disk.
2. You can also connect the external disk when in Recovery Console and set it as the Startup Disk, when you are exiting the Recovery Console.
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Jan 15, 2016 6:06 PM in response to Loner Tby wykstra,Ok, I am able to boot into external USB and typing this from el capitan that I installed on it. How would I use gpt fdisk now ?
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Jan 15, 2016 6:09 PM in response to wykstraby Loner T,Can you run diskutil list and post the output? Your internal disk should still be disk0.
Run
sudo gdisk /dev/disk0
p
Can you post the output?
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Jan 15, 2016 6:21 PM in response to Loner Tby wykstra,Backups-MacBook-Pro:~ backup$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *500.3 GB disk0
1: Windows_LDM 425.3 GB disk0s1
2: Windows_LDM 64.5 GB disk0s2
3: Windows_LDM 10.5 GB disk0s3
/dev/disk1 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS Untitled 1 999.3 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
Backups-MacBook-Pro:~ backup$
Backups-MacBook-Pro:~ backup$ sudo gdisk /dev/disk0
Password:
GPT fdisk (gdisk) version 1.0.1
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.
Caution! After loading partitions, the CRC doesn't check out!
Warning! Main and backup partition tables differ! Use the 'c' and 'e' options
on the recovery & transformation menu to examine the two tables.
Warning! One or more CRCs don't match. You should repair the disk!
Partition table scan:
MBR: MBR only
BSD: not present
APM: not present
GPT: damaged
Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.)
1 - MBR
2 - GPT
3 - Create blank GPT
Your answer:
When I entered the sudo command, it gave me a popup saying that the disk I inserted is not readable by the computer (strange since it's brand new). It gave an option to Initialize, Ignore or eject. Initialize is taking me to disk utility. Not sure if it is relevant to anything but stating what I found.
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Jan 15, 2016 6:24 PM in response to wykstraby Loner T,Do not make any changes to any disks. Please use GPT (2).
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Jan 15, 2016 6:25 PM in response to Loner Tby wykstra,Your answer: 2
Warning! Main partition table overlaps the first partition by 34 blocks!
You will need to delete this partition or resize it in another utility.
Warning! Secondary partition table overlaps the last partition by
4613656342287257470 blocks!
You will need to delete this partition or resize it in another utility.
Command (? for help):
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Jan 15, 2016 6:38 PM in response to wykstraby Loner T,Do not make any changes. Can you post the output of 'p' command?
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Jan 15, 2016 6:52 PM in response to wykstraby Loner T,Can you post a text version of the the same screen?
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Jan 15, 2016 6:54 PM in response to Loner Tby wykstra,I tried posting it but the non-english characters are not allowing me to post the entire thing. Do you want me to delete the other characters and post ?
Command (? for help): p
Disk /dev/disk0: 977105060 sectors, 465.9 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 791B2542-0766-402A-A757-9D97F1179267
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 977105026
Partitions will be aligned on 8-sector boundaries
Total free space is 1177 sectors (588.5 KiB)
Number Start (sector) End (sector) Size Code Name
1 40 409639 200.0 MiB EF00 EFI System Partition
2 409640 829351119 395.3 GiB AF00 Customer
3 829351120 830620655 619.9 MiB AB00 Recovery HD
4 830621696 977104895 69.8 GiB 0700 BOOTCAMP
17 18376656804508598272 4613656343264362496 512 bytes FFFF
19 4179340454199885824 4179340454210529341 5.1 GiB FFFF
Command (? for help):