0
votes
0answers
40 views

Yosemite Beta—Having trouble with dual boot with linux [on hold]

So I recently installed the Yosemite beta on my Macbook Pro. I dual boot OS X and Ubuntu with a partitioned hard drive using rEFIt. But after installing Yosemite, rEFIt disappeared and with it, my ...
0
votes
1answer
24 views

If I mess up the EFI System Partition, will Mac OS X be unbootable?

I forgot to make a backup of my EFI System Partition (ESP) and have installed grub onto it. If I happen to accidentally mess up the partition, will OS X be bootable? If not, how would I restore the ...
1
vote
1answer
82 views

Creating a EFI partition

I have been having trouble installing OS X Mavericks and I think I found the problem. It told me I couldn't boot up with Macintosh HD, so I verified my disk and I got this error: This disk doesn't ...
1
vote
0answers
138 views

Dual boot Ubuntu 14.04 on a MacBook Pro

so after a few hours of Google searching and too many headaches with a broken GPT, I've turned here. I have a 2012 MacBook Pro (9,2) that I want to dualboot OS X 10.9 and Ubuntu 14.04 on. I've read ...
1
vote
0answers
150 views

Corrupted hybrid GPT disk and possible fixes

I have a 17" Mac Book Pro (Late 2011) which have dual boot Windows 8.1 installation via Bootcamp along MacOSX. Prior to Mavericks upgrade I had this disk layout EFI Machintosh (~115 GB) Bootcamp ...
0
votes
0answers
72 views

Efi Boot appears on BootCamp page

I'm new in this forum and I hope someone has an answer for my issue. Since yesterday my mac-book pro won't boot in Os X I have boot-camp on it If I turn on normally the apple logo, loading circle ...
2
votes
1answer
215 views

FreeBSD Install DVD corrupted my Mac OS X harddisk

Recently, I have tried a FreeBSD 7.4 i386 Install DVD, just to see some screens of FreeBSD on my Mac mini Intel 2006. I was going to see (to remember) just several dialog screen of and perhaps I would ...
2
votes
1answer
1k views

Mountain Lion, EFI and Intel SSD Toolbox

Here's the problem: I want to do a clean install of Mountain Lion on my (custom) Intel 520 SSD inside my iMac. The first time this SSD was setup, it was done by a certified Apple Retailer. This ...
9
votes
4answers
50k views

How to fix broken EFI partition?

I have an iMac running OSX Lion. I also installed bootcamp and Windows 7. During the install of Windows 7 I wasn't paying complete attention and deleted and formatted the EFI partition. I didn't ...
4
votes
1answer
1k views

Why does Disk Utility create EFI partitions on external disks?

A technical told me about the EFI partition that... ...it's only there in case your computer will do an EFI update so the update files can be loaded onto the EFI partition. This is consistant with ...
3
votes
1answer
4k views

Disk Utility says: “Error: This disk doesn't contain an EFI system partition.”

After a clean install of Lion, followed by partitioning which again was followed by a installation of Ubuntu, I noticed some error messages of Disk Utitity. When verifying the volume I get told that ...