Refit For Mac Yosemite

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Oct 26, 2010  How to install rEFit on MAC OS X (Including Sierra) - Duration: 1:32. Buggy Fever 36,251 views. Recently, Apple released OS X 10.10 (aka Yosemite), and I've been getting e-mails with problem reports. Unfortunately, my only Mac is an ancient 32-bit model that can't run the latest version, so I can't investigate the cause of the problems myself; however, I think I understand most of what's going on. There are two main problems.

Restore default bootloader without harming partitions 14 comments Create New Account

The Cloverboot loader is a Hackintosh boot loader that incorporates, among other things, its own unique forks of rEFIt and of DUET (a TianoCoretool to boot UEFI on BIOS-based computers). Pete Batard's efifsproject aims to port GRUB's filesystem drivers to function as standalone EFI filesystem drivers. OS X 10.10, aka Yosemite, sports a more modern look and bridges the gap between Apple's desktop and mobile devices. The new Continuity helps you hand off tasks from iPhone to iPad to Mac, but that. OS X 10.10, aka Yosemite, sports a more modern look and bridges the gap between Apple's desktop and mobile devices. The new Continuity helps you hand off tasks from iPhone to iPad to Mac, but that.

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Restore default bootloader without harming partitions

Here are some technical details to understand what this hint is talking about.
First, a bootloader was not restored. Mac OS X has no boot loader in the traditional sense. What you are referring to is the boot code in the Master Boot Record of disk.
The first sector of the GUID Partition Table (GPT) disk contains is a Master Boot Record (MBR). Traditionally, the MBR contained a bootloader that would start the system running. Mac OS X does not normally use this bootloader.
Mac OS X normally uses EFI. The EFI bootloader location is stored in various NVRAM variables that indicate what file to load in order to boot the computer. EFI is much more advanced than older boot systems in that it includes the ability to mount and read file systems.
However, the Macintosh also supports Boot Camp. In order to support Boot Camp the Macintosh will boot from the MBR as described above. The boot settings in NVRAM can be set so that the Macintosh will boot using the MBR instead of the normal EFI settings. This is what makes Boot Camp work. (This is an Mac extension that is not a part of EFI.)
The Ubuntu installer changed the bootloader in the MBR and also set the system NVRAM variable to boot from the MBR. This made it so that your main disk would not show up.
Resizing the partition causes Disk Utility to erase the MBR bootloader and return the system to using EFI.
I would have to guess that opening the Startup Disk Preference Pane would have allowed you to switch back to OS X, although the Ubuntu loader still would have been present. You would see that in the Startup Disk Preference Pane as a selection to boot into Windows. :-)
Just some fun technical knowledge to explain what is really happening.

Restore default bootloader without harming partitions

Yep, also rEFIt is not a bootloader, but rather an EFI executable that allows more control over the default Mac EFI functions (and some other useful EFI tools).

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Restore default bootloader without harming partitions

Good explanation. This also goes to show why you in general need to be very careful with anything non-Apple that modifies partitions or boot loaders. The way Apple deals with the MBR is actually rather non-standard. Typically, the MBR is not used at all with EFI, a small amount of data being written there only to let non-EFI systems know that the drive is not blank. Apple actually does write a proper Master Boot Record for the purposes of allowing systems that do not support EFI (Windows XP, and all 32-bit versions of Windows Vista/7) to boot natively. So you have a system with both a Master Boot Record, as well as EFI boot info written to NVRAM. Windows and Linux based disk utilities don't expect this setup and results may be different than you would expect.

Restore default bootloader without harming partitions

Thanks for the interesting information. I did indeed try to reset the startup disk from System Preferences, but it didn't work. Perhaps it was because I had booted from an external drive.

Restore default bootloader without harming partitions

So is there someway to manually erase the MBR bootloader and/or return the system to using EFI through a command console of some sort before entering the OS or through the terminal using the OS X boot disc? I am having the same problem as the OP, but I cannot see the primary partition in the disk utility using the boot disc, and I can't use the trick the OP used.

Restore default bootloader without harming partitions
Restore default bootloader without harming partitions

Hello, being very new to this thread, I want to point out the big trouble I have . After installing BOOTCAMP on the 5 gb partition and running everything as described, I cannot boot the Mac or the WIndows . I presume it starting straight in Windows with a black screen and the message with DISK ERROR , PRESS ANY KEY TO RESTART comes up, the chime is there also. If pressing any key nothing happens . Tried a number of times to restart while holding OPTION KEY. Only them I got a light grey screen with a padlock and a box where I supposed to introduce a password . Tried that to insert my usual Mac admin password, is not working . I have inserted as well the original disk OS 10.5 to run the disk utility, it doesn't respond to C or any other command . I have tried T target mode, it doesn't take a target mode or maybe I am doing something wrong . Please help . Thanks guys .

Restore default bootloader without harming partitions

I'm having the exact problem as you describe it, but when I go to disk utility, and select the volume, it only shows one disk partition, the one that I tried to boot windows on, and not my original partition, and I can't wiggle the little arrow thing like you described. The partition that shows up is only a fraction of my hard disk memory, but if, instead of 'current', I select multiple partitions, then my full memory shows up. How do I reboot back into Mac OS X??

Restore default bootloader without harming partitions

I just was tinkering with Ubuntu 9.10, trying to install on a USB hard drive. It was successful, but could no longer boot OS X. I found this, but I couldn't change partitions in DiskUtil. Then I remembered that OS X is based off Unix/BSD. Looked up the manuals for fdisk. Used it from command terminal from OS X install DVD.
fdisk -u /dev/disk0
fdisk here is very similar to the DOS fdisk program, just designed for UNIX
the -u tells it to update MBR without modifying partitions
/dev/disk0 is the hard drive. yours may differ, but i doubt it
This fixed my problem.
Long story short, yes you can do it easily from command line, just boot your install DVD. In terminal, type the command listed above.

Restore default bootloader without harming partitions

Hi Chris.
Same problem for me, same fix that worked perfectly well. I knew my data were not corrupted but only hidden but I was afraid to get the situation worse by doing some hazardous tries.
I was just about to install Refit (maybe it would have solved the problem as well...) when I found your post.
Thank you all people who take time to write down their experience for others.
Now, I am wondering how to get Ubuntu work on my external drive and MacBook...
Thanks again.
Benoit, France.

Restore default bootloader without harming partitions

Thank you very much! This hint saved from reinstalling my MacBook.
I damaged my Bootloader while preparing a Hackint0sh-USB-Stick - this is still working with OS X 10.6.4

Restore default bootloader without harming partitions

Thanks! I did the exact same thing and this hint saved my bacon. Kudos....

Restore default bootloader without harming partitions

Hello,
Thanks a million !
This is the only post I found with information that did work and made me able to boot normally, instead of having the 'Waiting for root device' message, and seeing the 'EFI Boot' drive when pressing Option key on boot.

Restore default bootloader without harming partitions

None of the above worked.
My HDD is encrypted, would that be an issue?
I tried...
fdisk -u /dev/disk0
...no results.
I also tried...
fdisk -e /dev/disk0
flag 2 (for extended drive)
write
quit
reboot
....no results
Please help, I have a lot of sensitive data, for the most part is back up, but the most recent data isn't and is extremely sensitive.

Do you need a Mac OS X Yosemite Download for your older or unsupported mac? Well, you have come to the right place. I will be uploading different versions over the coming weeks on Just Apple Stuff. I had a lot of trouble when I was looking for my older 2006 Macbook.

Watch the Mac OS X Yosemite launch video here:

Download Mac OS X Yosemite from our server

Where to download Yosemite without an Apple ID? We uploaded Mac OS X 10.10 to our server for high downloading speed.

Mac OS X Yosemite Download:

File Type: .DMG

File Size: 5.33GB

Yosemite Direct Download: Direct Download

Yosemite Torrent Download:

Note: Let Us Know In comments if any link is not working, We will update ASAP.

Mac OS X Yosemite 10.10 is another product in Apple’s line of Mac OS X. Apple, in its line of amazing Mac OX titles, launched the Mac OS Yosemite 10.10 which took the world by storm. It new improved features allow even greater synchronization between iPhones and Macs when using the Internet.

It includes a Wi-Fi and Bluetooth 4.0 integration and introduction of FaceTime on computers. The users can make telephone calls directly from Mac through a local network connection.

How to Download Apple Mac OSX 10.10 Yosemite?

You can get the Mac OS X Yosemite Download directly from our site. Apple Mac OSX 10.10 Yosemite, the user doesn’t need to have the previous version. Secondly, a lot of the Mac applications will require updates as well. Mac OS X obviously is the supporting operating system.

There are different ways to download Mac OSX 10.10 Yosemite on different computer brands. We’ve compiled the steps for a Mac as well for Windows.

Downloading Apple Mac OSX 10.10 Yosemite from Apple Store

The users can still find Mac OS X Yosemite Download here and its available for free download.
After the completion of the download, the OZX Yosemite Installer will appear on “/Applications”. If the user wants to get nstallESD.DMG’, then they can follow the below steps.

1. Go to “Application”.
2. Click on “OS X Yosemite”.
3. Click on the “Show Package Contents” option.

Download Apple Mac OSX 10.10 Yosemite on a Windows PC

The user will need to download the following Mac OS X Yosemite Download, UniBeast, and Multibeast. Also, id required then DSDT. The need for an account on tonymacx86 is needed before downloading the above files, excluding Yosemite. For those who don’t, they can make theirs by registering themselves here: http://www.tonymacx86.com/register.php. Remember, the files need to be unzipped as well.

Create A Bootable Yosemite USB

Step 1: The user will need to download OSX Yosemite from the link is given above in the article.

Step 2: The user will need to make a USB Drive that is bootable. To get that, the following needs to be done.

a)Insert a high memory USB Drive. Go to Open>Applications>Utilities>Disk Utility. Choose your USB option here.

b)Click on “Current” and select “1Partition”, on the Partition Tab on your computer.

c)Click on Options>Master Boot Record.

d)Fill in the following information under each field.
i. Name: USB
ii. Format: Mac OS Extended (Journaled)

e)Click on Apply>Partition.
f)From your desktop, open “UniBeast”. Keep clicking on “Continue” three times and then click on “Agree”.

Refit For Mac Yosemite Download

g)Select USB>Continue, at Destination Select.

h)On the “Select OS Installation” option, choose “Yosemite”. Click on “Continue”.

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i)Choose “Laptop Support” if using a laptop or “Legacy USB Support” if using a 5 or 6 Series System. Click on “Continue”.

j)Click on “Install” after entering the password.
A bootable USB drive will be created by UniBeast. After completion, add your MultiBeast folder in the USB drive.

Step 3: The user will then need to boot in the USB Drive after the above steps.
a)After turning on the computer, the user will need to choose the boot device (F8 or F12 key).
b)Click on “USB-HDD”. At the Chimera Boot Screen, click on USB>Enter.

Step 4: Here, the user will need to install Mac OSX 10.10 Yosemite. After getting to the Installer, follow the steps below.

a)On the top menu bar, select Utilities>Disk Utility. Then choose your target hard drive for the installation.

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b)Click on Partition>Current>1 Partition>Options>GUID Partition Method.
c)Fill in the following information in the respective fields.
i. Name: Yosemite
ii. Format: Mac OS Extended (Journaled)

d)Click on “Apply”.

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e)Click on “Partition”. Close “Disk Utility”.

f)You’ll be asked the location to install. Choose “OSX”. (or, your previous install if you’re upgrading)

g)At the Chimera Boot Screen, choose your new “OSX” installation. Follow by complete the entire process.

Step 5: Lastly, the user will need to finalize the installation with MultiBeast as per the needed options.