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11

You can recreate the EFI System Partition (ESP) using the command-line gpt tool. It should start at sector 40, and it should be 409600 sectors (exactly 200MiB) long. The GPT entry's type should be C12A7328-F81F-11D2-BA4B-00A0C93EC93B, and if you have a hybrid MBR, the type there should be EE. The format is actually a subset of FAT, not HFS+. You can read the ...


7

Yes, you can install a shell. You can also setup a firmware password, though you generally use utilities that run under Mac OS X to set it up (Apple include's Firmware Password Utility on the install DVD, but does not actually lay it down on the system partition). EFI is probably less interesting from an hobbyist perspective than OpenFirmware was. Even if ...


4

EFI is a contract that specifies how the hardware can find and start the software and vice versa. Rather than have to build custom code into each new hardware device and each new software release - a standard was agreed upon and the specification was initially written by Intel. Then a company like Apple decides to adopt a certain version of the EFI ...


3

You could try installing rEFIt, which will give you a boot menu every time you boot up. http://refit.sourceforge.net


3

So you can image the drive and get things set up while your new drive is in an enclosure and only swap it into your Mac as an internal drive once it is tested and ready to go. Also, not having to code special exceptions when to and when not to write an EFI partition is sound engineering practice. You can't write buggy code if you don't write any code.


3

I finally managed to successfully downgrade the EFI firmware to version 1.6. Unfortunately that didn't make my hard drive work. However I'm going to reproduce my steps here so that the whole world can know what it takes: Download the EFI firmware update package from Apple. Here is the link I used for firmware version 1.6 for my Macbook Pro: ...


3

First install rEFInd, and boot Ubuntu installer after. Enable "Boot after power failure" by adding next line to /etc/rc.local: `setpci -s 0:1f.0 0xa4.b=0` Install mac fan control: sudo add-apt-repository ppa:mactel-support/ppa sudo apt-get update sudo apt-get install -y macfanctld applesmc-dkms For SSD tunning (you have to adapt to your config) here ...


2

Removed vertex2 SSD - Mac booted. Looks like the SSD has failed, because if I install the SSD to other SATA slot, the MacBook does not boot, either. Also, this drive is invisible with external SATA to USB adapter. It's Good to have a backup solution.


2

If you are still looking for an answer I found one on Stack Overflow: http://stackoverflow.com/questions/777437/sopen-s-firmware-console-on-mac-osx-intel It does not seem possible to do this. The only thing you can install to get some kind of EFI boot menu options menu is rEFIt, which can be found here: http://refit.sourceforge.net I know it isn't ...


2

Yup, apparently it is missing and you have to install EDK to get it.


2

Delete the EFI partition, do your secure erase, then don't partition or format the drive from Windows 7. Instead, boot from the OSX installer disk or recovery environment, and use its version of Disk Utility to partition the drive, using the GUID partition scheme. Disk Utility will create the EFI partition for you if done this way. To be clear: the EFI ...


2

It seems that some early 2011 15" Macbook Pro (8,2) machines have trouble creating a Fusion Drive. It's being discussed in this MacRumors forum thread: http://forums.macrumors.com/showthread.php?t=1480179&page=16. This is the post that gives more datailed information about the problem ...


2

If you can successfully start your Mac from a Mac OS X DVD take a look at this: http://pubmem.wordpress.com/2011/04/09/flash-efi-firmware-update-manually-on-a-macbook-51/, especially comment 54 and follow-ups. It explains how to manually flash the EFI firmware: Download the EFI Firmware update from Apple. This link lists EFI and SMC firmware updates. You ...


2

I found a post on the subject from the guy who wrote this book about Mac OS X internals. His post mentions Snow Leopard (10.6), but the issues would be similar for 10.7. See Mac OS X Internals - Is Your Machine Good Enough for Snow Leopard K64? Here's the part I found most relevant to your question: [...] Unfortunately, a 64-bit processor alone doesn’t ...


2

EFI firmware updates are 'staged' in the normally hidden EFI partition on your disk, which typically resides at device /dev/disk0s1. Once in single-user mode, you can create a folder in which to mount this partition, then mount it like so: mkdir /Volumes/efi mount -t msdos /dev/disk0s1 /Volumes/efi From here, navigate into the /EFI/APPLE/FIRMWARE/ ...


2

They are hidden partitions in OS X. Showing all partitions in Disk Utility also shows the partitions in the list: …and diskutil list: 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Mac SSD 150.0 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 They are usually not mounted by default and therefore not shown on the desktop ...


1

I could see how there would be a possibility to work around this. I assume this would come from the hackintosh community. However.. You might be able the core OS but then run into trouble with drivers. An example would be the graphics card. It's a GMA 950 right? As far as I know Apple never released 64bit drivers for it. So even if you get this running, you ...


1

Using the Intel power gadget (above) shows your CPU running at low speed. In normal case that would be fine if there is no load. I have MBA with 1.8 GHz Intel Core i5 and runs at 0.85 at normal use, how ever it does spikes to 1.8 + under load. Since the computer processing speed depends on more than one factor (CPU +SSD read/Write+RAM)... I would say you ...


1

Yes, Viasat's Eclypt product range works with Mac (EFI) and provides full disk, FIPS approved, hardware encryption. See: Eclypt Core Self-Encrypting Internal Hard Drive The datasheets for the Eclypt product range are not yet up to date (but Mac OS X 10.5+ is supported as is Apple UEFI). You can see the specific product at ...


1

This is a good question and - yes - finding an answer to it is almost impossible. Samsung sends to Apple support. I would expect to hear from Apple that it's not possible. Full disk encryption HW vs FileVault - difference in performance is noticeable. If you are not business user on strict encryption requirements, then we need to look for HW based Samsung ...


1

Go to system preferences then startup disk. Then select Mac OS X and hit restart.


1

I had a similar issue installing Windows 8 x64 on a 2013 Macbook Pro Retina running Mac OS 10.8.3 (which does support Windows 8) and the problem turned out to be an issue between the 32GB USB 3.0 installer drive I was using and Bootcamp Assistant/Mac OS. The USB drive was not defective. I went through the Boot Camp Assistant process three times using a ...


1

The BIOS emulation only kicks in if you use MBR or hybrid GUID + MBR partitioning. By default, Macs only use GUID partitioning. Installing Windows via Boot Camp enables this hybrid partitioning, but you can in principle also do it manually for Linux. The downside is that you then have to maintain two partition tables and make sure to keep them in sync. It ...


1

Try this: Back up drive on time machine. Restart, rebooting on Lion install disk. Go to Disk Utility. Erase Partition. Erase HD. Re-erase partition again, this time giving it a name. Click on HD. Verify HD to confirm EFI error message no longer appears. Go back to install screen. Choose restore from back up.


1

Credit goes to @bmike for answering this one, but I wanted to answer it here so the question is closed. Marking as community wiki so that I'm not taking credit. In this situation you will want to use the recovery tool built into the system's firmware, called "OS X Recovery". You can read Apple's documentation here. To start OS X Recovery, hold Cmd+R while ...


1

It appears that the Mac Mini version that I purchased cannot, as of the time of this post, accept an alternate operating system. Hacks and workarounds may exist, but they are not apparent.


1

The boot selector scans all possible boot devices, including network, firewire, and USB devices. Try disabling WiFi, unplugging everything, resetting PRAM (like cksum said) and then rebooting again. The fewer choices the boot-loader has, the faster it will load. The ultimate speed up, is to go into System Preferences -> Startup Disk to select the desired ...


1

On portables, firmware update will not run unless the machine is connected to AC power http://support.apple.com/kb/HT1557


1

Sometimes 'Software Update' fails and you are stuck with an incomplete update if this happens you can try to download the update as package direct from Apple (MacBook Pro EFI Firmware Update 2.7) http://support.apple.com/kb/DL1499 Install the package, maybe this will fix the problem.


1

I had the exact same problem and the latest version of Alsoft's Diskwarrior fixed the problem and now all seems good. hopefully it will work for you as well.



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