- Joined
- Jan 16, 2011
- Messages
- 558
- Motherboard
- Asus ROG MAXIMUS X HERO
- CPU
- i7-9700K
- Graphics
- RX 580
- Mac
- Classic Mac
- Mobile Phone
I noticed several posts dealing with this issue. Maybe we can collect our workarounds here.
They may be very different and depending on whatever is causing it.
Let me start with what I had recently:
Situation:
"GPT boot error" displayed when trying to boot from a brand new formatted and freshly installed OS X hard disk.
Using a different hard disk´s bootloader and selecting the affected drive from chimera´s menu would end in a successful boot, but either having the corrupted drive as first in BIOS start sequence or selecting it during POST via F12 fails.
What did not help:
Reformatting, repartitioning via disk utility.
Successful:
Erasing the GPT (GUID partition table) via windows (7/XP/Vista).
1. Open CMD (enter the string "cmd" into window´s search function and <enter>).
2. Type "diskpart" (without quotes), <enter>, confirm security request.
3. Type "list disk" <enter> to obtain an overview of connected drives.
4. Type "select disk number" <enter> (where "number" represents the number of the drive that you intend to erase) to select the desired drive.
5. Type again "list disk" <enter>. The previously selected drive should now show to be selected by a "*" in front of it.
6. Type "clean" <enter> to erase the drive. Completion will be confirmed by a message (that I don´t know the English equivalent). The protected GPT partition is now erased.
7. Type "exit"<enter> to leave diskpart.
When booting back into OS X you can now reformat/partition the drive as usual and install a new GPT partition using MultiBeast or any other tool.
Side notes:
This - of course - will delete all your data o the effected disk.
Nice to have a backup in advance.
But rather don´t try to use a recovery disk image via disk utility.
I did that in my first attempt (creating the img file took 7+ hours, read only, not encrypted!), but had to realize that obviously the corrupted GPT partition was part of the backup - and was restored
I just reinstalled everything, but I guess a copy tool which does not copy the GPT would do it as well. Don´t know what CarbonCopyCloner would do.
I´m shure there is an OS X internal solution via terminal available as well.
But I don´t know it (yet).
They may be very different and depending on whatever is causing it.
Let me start with what I had recently:
Situation:
"GPT boot error" displayed when trying to boot from a brand new formatted and freshly installed OS X hard disk.
Using a different hard disk´s bootloader and selecting the affected drive from chimera´s menu would end in a successful boot, but either having the corrupted drive as first in BIOS start sequence or selecting it during POST via F12 fails.
What did not help:
Reformatting, repartitioning via disk utility.
Successful:
Erasing the GPT (GUID partition table) via windows (7/XP/Vista).
1. Open CMD (enter the string "cmd" into window´s search function and <enter>).
2. Type "diskpart" (without quotes), <enter>, confirm security request.
3. Type "list disk" <enter> to obtain an overview of connected drives.
4. Type "select disk number" <enter> (where "number" represents the number of the drive that you intend to erase) to select the desired drive.
5. Type again "list disk" <enter>. The previously selected drive should now show to be selected by a "*" in front of it.
6. Type "clean" <enter> to erase the drive. Completion will be confirmed by a message (that I don´t know the English equivalent). The protected GPT partition is now erased.
7. Type "exit"<enter> to leave diskpart.
When booting back into OS X you can now reformat/partition the drive as usual and install a new GPT partition using MultiBeast or any other tool.
Side notes:
This - of course - will delete all your data o the effected disk.
Nice to have a backup in advance.
But rather don´t try to use a recovery disk image via disk utility.
I did that in my first attempt (creating the img file took 7+ hours, read only, not encrypted!), but had to realize that obviously the corrupted GPT partition was part of the backup - and was restored
I just reinstalled everything, but I guess a copy tool which does not copy the GPT would do it as well. Don´t know what CarbonCopyCloner would do.
I´m shure there is an OS X internal solution via terminal available as well.
But I don´t know it (yet).