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I managed to find this Below is a quote of a paragraph that explains the requirements to boot with EFI without rEFInd. And above that, the provisional booting to ubuntu with USB, and at the top, additional information Fixing the EFI Partition So why is the system unbootable? The problem is that the Mac bootloader expects the EFI partition to be ...


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Essentially you have a CoreStorage Volume Group instead of an old-style partition scheme. You shouldn't use Disk Utility to modify the CSVG. To shrink your CoreStorage Volume Group to get some unallocated space to install Linux or EFI-Windows just use an undocumented diskutil command: diskutil cs resizeStack LVUUID size The command expands or shrinks the ...


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There is a very simple reason for the lack of a resize handle on your current drive. Notice, in your screen shot, that in the left hand pane you have a disk labelled "Macintosh HD" which also has a volume labelled "Macintosh HD". With the disk highlighted, look at the bottom of the window and you can see that the disk is of the type "Logical Volume Group". ...


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you don't create partitions on empty space. You have to first create a partition by clicking the plus, resizing and then clicking apply. The resize handle shows up upon deleting partition. If that doens't work, there are several solutions, that I am listing because I stumbled upon them: Problem 1: Shows: Filesystem verification failed. Solution 1: Shut ...


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The steps you linked skip a crucial point - you have to actually create a second partition. I think it's assuming you already have a second partition that you want to format for installing Linux. In Disk Utility: Click on the hard drive on the left. Note that each drive has (at least) two lines: an identifier, such as "251 GB APPLE SSD SD02...", and a ...


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Windows 7 will not run from an external USB hard drive. This is a limitation of Windows, not your Mac. Windows can ONLY run from an internal, non-removable hard drive. That limitation applies even on a real PC.


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You can use every HDD for time machine except the system HDD, but if you partition ate your system HDD you can use the new time machine for Time Machine. Remember: don0t format all your HDD when formatting, you will format even your backup!


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You probably tried to manipulate a CoreStorage volume with Disk Utility. Core Storage volumes are built after enabling File Vault 2, creating a Fusion Drive or often after updating to Yosemite. If you don't have a second internal hard disk attached, disk0 is usually mounted to /. In your case disk1 is mounted to / which is a typical hint for Core Storage ...


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I like to do things a little differently and this involves separating the problem into two distinct parts - OS and Hardware. Let's look at hardware first. I like to use Ultimate Boot CD as it has a number of great utilities to test out your Mac. It runs on Linux so it completely eliminates OS X from the equation. And if you are wondering, yes, this will ...


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Basically the same applies as in this question and the accepted answer. The only difference is that you have a fusion drive and therefore some DiskIdentifiers differ. Additionally you have a blocking partition on your HDD with certainty which has to be removed. There is one undocumented command to resize or expand a CoreStorage volume group and an inherent ...


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BEFORE you follow my instructions, take a Time Machine backup of everything. I'm going to have you destroy and recreate the Fusion Drive, which WILL erase your data. To see these instructions with pictures, you can go to the sources I used: Splitting a Fusion Drive and creating your own Fusion Drive. Boot into the Recovery HD (or from a bootable drive, if ...


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Thanks so much to David Anderson for the response to this article- Got me looking in the right direction. There's a little simpler article and method I found over here, I didn't need to reboot into recovery to make it work. Mac Partition shows up perfectly, now. http://awesometoast.com/yosemite-core-storage-and-partition-woes/


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I recently ran into this issue as well. I originally suspected a damaged SATA cable, but swapping the SSD into the optical drive bay and the HD into the primary hard drive bay solved the issue for me.


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In the off chance it is not a hardware problem with the cable, try creating GUID partitioned disk (GPT) with no partitions. This can not be done using the Disk Utility alone. To do so, follow these instructions. Open the Disk Utility. Highlight the disk and click on the Info button. Determine the Disk Identifier. In the example below, I used disk2. Close ...


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I had a similar issue and the below trick solved it. Resetting NVRAM Shut down your Mac. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. Turn on your Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the startup ...


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If your main partition is encrypted it will not be unlocked and mounted after booting to Recovery Mode. After starting Disk Utility you have to unlock the volume first. Then enter the FileVault2 password. The volume will be mounted automatically after entering the proper password. Now verify or repair your main volume.


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The answer is YES. My mid 2007 iMac is currently configured in such a fashion. My Windows 8.1 uses a BIOS boot. I have two NTFS partitions, one exFAT partition and two HFS+ partitions. (I also have the hidden EFI partition and the hidden OS X recovery partition) The exFAT partition is read/writeable from all operating systems. Do you need to keep your ...


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Presumably Windows messed up with your OS X boot code. You have to rebuild this code. Since OS X tools can not handle a false flagged partition you have to set the correct partition flag and afterwards rebuild the boot code using OS X Disk Utility. Since you can't boot from the now unaccessible recovery partition you have to have Linux-tools and a second ...


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This is another scenario that illustrates why creating USB install media is a good idea, as opposed to simply downloading and running the installer. Link to instructions for creating a USB installer here.


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Did you run the YosemiteBetaAccessUtility.pkg? Access via the Apple Beta Program You'll need to sign in or create an account to get to that link. You can't get to the betas without it. Your error message looks like the one you would get if you just tried downloading the current Yosemite release again.


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When you go to the purchases-tab OS X Yosemite should show up with a Download button. When you click it it asks you if you want to re-download it event though it is installed. (Downloading from the purchases tab is different from downloading from the product page I believe.)



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