Tag Info

Hot answers tagged

12

If your partition turned into Logical Volume Group (you can't resize or delete Yosemite partition), you can revert partition type with few command line. Open Terminal type diskutil corestorage list Find Yosemite partition UUID string. type diskutil corestorage revert <UUID> Your Yosemite partition is now revert to default partition type. Now, you ...


11

After gaining some experience with CoreStorage volumes, I reworked my first answer to generalize and facilitate it by adding some scenarios and deleting some dispensable steps. Basically there is one undocumented command to resize or expand a CoreStorage volume group and an inherent logical volume: diskutil cs resizeStack LVUUID size The command ...


9

I had the same issue since the beta and the official release did not solve this issue. In the terminal I had the following output: diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *251.0 GB disk0 1: EFI EFI ...


8

The following diskutil cs resizeStack command is vastly undocumented and as such potentially destructive. There might be an easy way outlined first and a long winding, time consuming hard way. Please backup your Mac OS X before proceeding. The not-as-long-as-expected way: A 2nd computer or an iPhone with the stackexchange credentials to enter the site ...


8

To be able to create a multi-boot environment you have to revert from a CoreStorage partition layout to a standard partition layout. Start to internet recovery mode by pressing altcmdR while booting. Open Terminal.app in the menubar Utilities → Terminal enter diskutil cs revert LVUUID and hit the ⏎ key. (LVUUID is the Logical Volume UUID. You get it by ...


7

Quick fix: Fake Bootcamp. "I partitioned the free space (that OS X couldn't use) as MS-DOS, Bootcamp Assistant thought it was Windows, and was able to remove this MS-DOS partition and restore Mac OS to a single partition." This is the easiest solution, so try that first. No luck? Long fix: In my case, I couldn't get Disk Utility to create the ...


6

Yes you can repartition without losing data. Using Disk Utility, perform a repair on your drive to make sure the drive is free of errors (even better, use Diskwarrior if you have a copy). Then unmount your drive but don't eject it. Select the drive in the left hand pane, then go to the Partition tab. On the Partition Layout section click on the "+" to create ...


5

Theoretically everything is fine with your Fusion Drive. Fusion Drives look like this. Disk0 is your SSD with 121 GB and disk1 is your HDD with ~1 TB (~1.121 TB summed up). The larger parts of your SSD (disk0s2) and your HDD (disk1s2) are pooled to a CoreStorage LVG (Fusion Drive: disk3) with a size of 967.8 GB. The rest is reserved for EFIs, a Recovery HD ...


4

Your internal disk is a Fusion Drive combining an SSD (disk0) and a HDD (disk1). It uses a Core Storage partition scheme. The superior "Macintosh HD" is the name of the Logical Volume Group build by the compound of the two Physical Volumes (disk0s2/disk1s2) of your Fusion Drive. It's used instead of the name of the physical device in a non-Core Storage ...


4

The Mac hardware stores the boot volume in NVRAM so you could power off the computer and then reset things by holding the Command Option P R keys down. Once you've heard two boot chimes you can release things and if the Mac OS X volume is viable it will boot first. If that doesn't work then it's likely that the OS X volume has issues and the system is ...


4

Are you aware of this thread at Apple Support Communities? https://discussions.apple.com/thread/6601122 According to this, Yosemite changed the way the Recovery Partition works when you have Core Volumes. It no longer shows in the list of drives when you boot with the option key pressed. The way to do it is by pressing Command-R. I don't have Fusion ...


4

It seems that i did it using this post Unable to Resize Partitions and your comment. Although it wasn't obvious for me, what I did was this: diskutil corestorage resizeStack LOGICAL_VOLUME_UUID 0G 0G to expand it to the maximum available space that is free. diskutil corestorage resizeStack can provide with info.


3

I have never, and I mean never, even back to the "classic" Mac O/S days (going back to system 6) partitioned a drive into smaller chunks. Performance gains were supposedly about different parts of a rotational drive being faster than others (EG quicker seek to sectors near the physical hub). There may also have been some O/S speed gains in some O/S if you ...


3

This Mac Book Retina was originally delivered with Mountain Lion. The upgrade history contains Mavericks, several Yosemite DPs and finally the Yosemite GM Candidate. One of the Yosemite Developer Previews transformed the previous Apple_HFS partition into a Logical Volume Group. The (only) Logical Volume is not revertible: The Boot Camp assistant can't ...


3

I had a similar problem. I created a 30 GB partition and after deleting it there was unused space. I couldn't manually get the original full partition back because of disk errors. So I booted into Recovery (Command + R), repaired the disk with Disk Utility and then the resize to original was no problem. Rebooted and now back to normal. Had no need to ...


3

If your Mac OS partition is encrypted with FileVault 2, it will be unreadable when you are booted to Windows. At that point, the only thing malware could do to this partition would be to wipe or delete it.


3

I am astonished about complexity of this problem (see @klanomath answer) and easiness to create it. So I tried to play with it and find a work around and succeed. My problem was the following: I had 500GB disk on which I created 150GB Macintosh HD and 350GB of "free space" using Disk Utility. When I tried to format the free space and pressed Apply it ...


3

There are at least two approaches to solve your problem: One is potentially destructive, vastly undocumented and i don't know if it works (1) and the other one is for sure destructive (2). So please backup your Mac OS X and your Ubuntu partition if necessary. Requirements: USB thumb drive with a full working Mac OS X and iPartition installed or a Linux ...


3

Your volume Macintosh HD is a Core Storage Logical Volume and part of a Core Storage volume group and thus can't be modified by iPartition or Disk Utility. You have to boot from an external disk, a thumb drive or in the Internet Recovery Mode to be able to modify the volume with some Terminal commands. The following diskutil cs resizeStack command is ...


3

I have run Mavericks/Yosemite on a 64 GB SD card and after a clean install, there was about 20-30 GB free. I would say that you could install Yosemite on a 20 GB partition, but I would not recommend anything less than 30 GB.


3

Instead of rebooting constantly to test software in different environments, try a virtual machine. I use VMware Fusion. Major advantages include suspend rather than shut down, and you can have as many as you have disk space for. You can have as many running simultaneously as you have memory for, and you don't need extra hardware to handle different versions ...


3

To delete CoreStorage volumes you have to use the CLI: please backup your volume "mainHD" boot to Internet Recovery Mode (hit altcmdR immediately after the start-up chime) open Disk Utility and check/repair mainHD quit Disk Utility , open in the menubar Utilities/Terminal.app and enter diskutil cs deleteVolume LVUUID to delete the Logical Volume in your ...


3

To rename the Recovery Partition, falsely named "EFI Boot", I first mounted the Recovery HD, by showing all partitions in Disk Utility. To show all partitions: 1.) quit Disk Utility 2.) In Terminal write or paste: defaults write com.apple.DiskUtility DUShowEveryPartition 1 and hit 'enter'. Launch Disk Utility and mount the hidden, but now showing "Recovery ...


2

This is an example of a procedure to erase an external disk containing a single encrypted partition. Open the Disk Utility application and highlight the "Logical Volume Group" representing your external disk. An example is shown below. (Hint: click on image for a better view.) Next, click the Info icon to get the pop up window. Note, in the example shown ...


2

According to Apple, you must use BootCamp to initialize a Windows partition or it won't work. I suggest you do the following. Get WinClone if you don't already have it. The best way to back up your BootCamp partition. http://twocanoes.com/winclone/ Use WinClone to back up your BootCamp partition. Initialize your new hard disk to Mac OS X. Use BootCamp ...


2

Your Recovery HD doesn't occupy your whole 3 TB drive. It's disk1s3 in the diskutil listing with the common size of 650 MB. Your Logical Volume Family and the Logical Volume vanished though. To rebuild it start to your Recovery HD or to Internet Recovery Mode, open Terminal and enter diskutil cs list. Copy the LVGUUID To recreate the LV enter diskutil cs ...


2

The problem turned out to be the PMBR. My first attempt was to copy sector 0 off a GPT formatted memory stick. Examined that with fdisk and it had partition of type EE, but start and end cylinders were the same. I edited partition 1 and accepted defaults. fdisk on mac will report "can't get exclusive access to write sector back, reboot required" It ...


2

Although I don't know what specific property of HFS+ allows a user to modify the current system partition while in use; my expectation would be that operations to blocks of storage that the filesystem is not currently utilizing are allowed. Now if you tried to shrink the system partition below the current size of your system installation (the blue shaded ...


2

I suspect Windows` chkdsk or another Microsoft tool to erroneously repairing the partition table of your device containing the EXFAT volume. The result of sudo gpt -r -vv show /dev/disk2 of my 4 TB device created in a VM and formatted with Disk Utility in comparison looks like this: gpt -r -vv show /dev/disk2 gpt show: /dev/disk2: mediasize=4000655081472; ...


2

More people have problems with BootCamp trying to partition manually than any other way. This is what I would do: Boot into recovery mode. Get into disk utility Delete the partition you created for Windows Expand your Mac partition all the way into the available space Now (assuming you already have the BootCamp media created) Run the BootCamp.app and ...



Only top voted, non community-wiki answers of a minimum length are eligible