Transition to Mavericks - GUID partition issue Solved/Closed

Question

Hello,

I'm posting here because despite my searches on Google, I haven't found anything that could help me with my problem.

On paper it seems simple: I have a MacBook Pro purchased in mid-August last year running Mountain Lion.
I downloaded OS X Mavericks from the App Store to upgrade my machine. However, when I launch the application I just downloaded and get to the point where I'm asked to choose the installation hard drive (in this case my "normal" hard drive), I get a bubble saying: "this disk does not use the GUID partition table scheme. Change the partition scheme using Disk Utility. Select the disk, choose the partition tab, select the volume configuration, then click on Options."
However, the procedure does not apply to my current hard drive since it appears necessary (apparently) to format the disk. Yet, this is the disk where my current OS is installed.

In short, I'm stuck, how can I either:
change the format of my hard drive to use the GUID partition.
create a bootable USB drive to completely reinstall the machine (I made a Time Machine backup to recover my data post-installation)

Thank you in advance for your response, hoping I've been as clear as possible
Best regards,

Tom

Configuration: Mac OS X Mountain Lion (10.8) / Firefox 24.0

_Ritchi_ · Answer

Hello,

You can try to create a bootable USB drive or DVD for Mac OS X Mountain Lion using DiskMakerX.
If you succeed, all you have to do is boot from this new media and reformat your internal drive as it should have always been.

Ritchi

Tom · Answer

I had already thought of this solution (hence my question regarding bootable drives) and had therefore already come across this solution.
But when looking to download the utility:
http://diskmakerx.com/?p=205
"Due to some outstanding bugs in DiskMaker X 3.0, I decided to remove it from the website, so that I can work on fixes ASAP."

*_Francis_* · Answer

Hello,

A brand new Macbook running ML with a disk that isn't formatted under GUID scheme?? Almost impossible.

What does Disk Utility say about this hard drive?

In any case, I recommend reading this discussion to the end:
https://forums.commentcamarche.net/forum/affich-28963408-maverick-encore#1

Best of luck.

--
Have a good day, or good night..:).
Francis

Tom · Answer

I read the topic, a goldmine of information :)
I'm going to follow ohmymac's tutorial this evening to create the bootable USB key and do a clean installation.

However, in Disk Utility, I have the impression that my disk is indeed already in GUID partition format:
Screen of Disk Utility: http://hpics.li/b96ede0

So, I admit that the error message leaves me puzzled ... :/

*_Francis_* · Answer

Hello,

Indeed ....

I don’t know the history of this hard drive. However, it is illogical for the recovery partition to be visible in Disk Utility, nor for the EFI part. On the other hand, we should be able to see the Boot Camp partition.

You can try just deleting the Macintosh HD part and installing Mavericks from scratch on it.

But for my part, to have a clean situation, I would do it this way:
-download Mavericks
-store the installation package safely on an external drive to avoid having to re-download it during the following operations
-create the USB installation drive for Mavericks
-boot from the Mavericks installation drive
-format the hard drive anew
-install Mavericks
-copy the Mavericks raw package that was kept safe just before onto the hard drive
-reinstall Mavericks on Mavericks from the installation package that is now back on the internal drive, this is to restore a recovery partition
-boot from the recovery partition by holding down the cmd and R keys
-repair the disk from Disk Utility of the recovery partition
-repair the permissions
-restart the Mac normally
-reinstall Boot Camp.

--
Have a good day, or good night..:).
Francis

Transition to Mavericks -> GUID partition issue

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