Apple Core Storage (sometimes referred to as coreStorage or CoreStorage) maintains a world of virtual disks that can provide the user with flexibility in allocating their hardware.

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How to use “diskutil corestorage revert lvuuid” on Yosemite if disk says it is not reversible?

I would like to make a partition for Linux. Here's what diskutil coreStorage list gets me (identifiers omitted): CoreStorage logical volume groups (1 found) | +-- Logical Volume Group ...
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How do I regain unaccessible free space after a failed Boot Camp install on a non-Fusion drive?

Firstly - I know this has been answered, but I am hoping for a more broken down answer, as I am not quite so technically minded, but I can follow instructions! So in summary I have tried to install ...
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Missing Space on Drive using Core Storage after Boot Camp Assistant Failure

Using Boot Camp Assistant, I started to create a 50 GB partition, but it hung on partitioning. After waiting about 30 minutes without the progress bar moving, I quit the Boot Camp Assistant, thinking ...
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2answers
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My SSD Drive has been converted to a Core Storage drive and cannot be erased/reformatted?

I put an SSD drive into my macbook pro. I should say that this drive hadn't been formatted and was a bootable drive with Yosemite OS on it, taken from another macbook pro... I booted the system up in ...
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CoreStorageFamily::unlockVEKs() failed to unwrap the vek, status = e00002bc

I have a filevault2 disk with two partition. One is the boot partition, the other contains data, both are encrypted. Today, after installing the latest 10.8 update (10.8.4 I guess), the computer ...
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65 views

corestorage failure: missing disk, how to recover data?

This morning, my iMac show me the prohibit sign. After hours of struggling, I'm facing this: the Mac does not want to boot up. I have a lot of recent files to recover, but have this issue: root# ...
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3answers
201 views

Missing space on Fusion Drive (partition problem)

I know this or similar problems have been discussed, but (to be honest) I can't see the trees for the wood. I tried to create a partition on my fusion drive (1TB Hd + 240 MB SSD). No partition was ...
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89 views

Revert Apple CoreStorage volume back to Apple HFS

I have a computer that is encrypted with Symantec PGPWDE. A scripting error occurred when trying to decrypt the system and remove PGP and convert the disk to CoreStorage to prepare for using file ...
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iMac partition grid screwed. Please help?

So yeah i guess i screwed up my iMac 5k retina's (late 2014) partition grid big time and i need your help. It all started yesterday when i tried to format my computer. I'm selling it tomorrow, that's ...
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120 views

Missing space in OS X El Capitan after removing a failed Boot Camp partition

I'm trying to help my girlfriend after a failed Boot Camp partition removed approx. 100 GB of visible space from her OS X volume. The main volume is encrypted with FileVault2. Partition table: ...
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85 views

Corestorage: Partial recovery from physical disk failure?

I have a MacPro with a corestorage LVG, with three physical drives: An SSD and 2 x 2TB drives. The fourth drive in the system was a Time Machine backup disk. The backup disk and one of the 2TB drives ...
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76 views

Fusion drive suddenly not bootable: “Too few free segments”, made read-only

I've dealt with a lot of disk issues over the years admining lots of different OSs, but this one is new to me... help/ideas appreciated before I give up and restore! Woke up this morning to my iMac ...
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796 views

Error: -69711 this operation couldn't proceed because the target's boot helper was mounted; you may want to try again

I have a MacBook Pro 8,1 (13", 2011 unibody) running Yosemite (no upgrades). Tried to partition my SSD hard drive and it threw an error when it was almost through saying it can't find the partition. ...
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4answers
3k views

Booted to Windows how do I enable access to a Mac CoreStorage volume?

I've installed Windows 8.1 with the Boot Camp Assistant on a solid state drive with a CoreStorage volume. Booted to Windows I can't see the files on my Mac volume anymore. I'm confused since this is ...
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1answer
142 views

DIY Fusion drive with 3 drives

Is it possible to build a DIY Fusion drive using 3 drives - 2 HD's and 1 SSD? Will the Fusion machinery optimise on three levels i.e. SSD, then fast HD, then slow HD? I have a mid 2011 27" iMac, ...
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99 views

Filevault makes my external HD inaccessible on OS X but still works on Ubuntu

I'm running OS X El Capitan 10.11.3 I have an external drive with 2 partitions. 1 partition is for Time Machine while the other is for storing my data (Volume name is Data). So a few days ago I ...
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78 views

Lost hard drive space to Boot Camp

Boot Camp caused ~200 GB of my 750 GB HD to disappear and I cannot re(un)-partition it through Disk Utility and when I try to reformat the storage through the terminal using: diskutil cs resizeVolume ...
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1answer
154 views

Problem with 3 TB Fusion Drive, it can't be deleted, formatted or partitioned

I want to clarify that I already followed the instruction with I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp) but I think I have mayor problems. I followed the instructions to ...
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1answer
270 views

Fusion drive unavailable after HD erase

I wanted to erase the 3 TB Fusion HD on my iMac in order to install a clean system and start from scratch. The erase went fine except right at the end when it said something about core storage... ...
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1answer
99 views

How can I encrypt a disk where diskutil cs convert reports “a problem”, leaves disk unreadable?

I'm trying to encrypt my Time Machine backup volume, but diskutil refuses, and leaves the disk unreadable (but repairable using Linux). How can I proceed? It's a Western Digital Elements 107C 3TB ...
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2answers
10k views

How do I remove unused partition (El Capitan)?

I have a partition that I no longer use. I've tried erasing with the disk utility GUI, but when I try to remove (with the '-' minus button on the partition view) this feature is disabled. I've also ...
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1answer
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How to fix the error: “This disk doesn’t contain an EFI system partition”?

I get the following error and cannot start Bootcamp after accidentally deleting the EFI-partition of my main drive. This disk doesn’t contain an EFI system partition. If you want to start up ...
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1answer
228 views

Expanding a Fusion Drive partition

I created a partition on my Fusion Drive when I first purchased my iMac running Yosemite, and I would like to now resize that drive ("Data" in the screenshot below), but Disk Utility doesn't allow it ...
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1answer
297 views

I erased the partition where Windows 10 was previously installed. How can I merge it with my OS X partition?

So I started up Disk Utility and erased my BOOTCAMP partition and set the format to OS X Extended (Journaled). This is how my partitions look like now: As you can see, I have a BOOTCAMP partition ...
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Resizing or expanding a CoreStorage volume

I bought a new SSD with 750 GB and made two partitions: 600 GB and 150 GB. The smaller one was thought to be a Bootcamp partition one day, but to date it was just another unused partition. When I ...
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430 views

Apple watch not syncing Health data

As the title suggests, my apple watch is working perfectly in termos of fitness tracking, the problem is in saving the data, the activity app on the Apple watch shows the activity rings full but the ...
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1answer
158 views

Decrypt an external hardrive FileVault

Recently, I had an accident with my Macbook Pro. I dropped water on it and the motherboard is now dead, which means my Macbook Pro is also dead. Hopefully, the hard drive isn't damaged. When I plugged ...
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1answer
218 views

Crashed when creating a partition - now missing drive space!

Just a couple of hours ago, while I was taking a GNU course, I decided to create a partition on my SSD to have ubuntu installed, meanwhile the disk utility was doing that, suddenly it just crashed and ...
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1answer
110 views

What's wrong with my Fusion Drive?

I'm having weird issues with my internal Fusion Drive. Symptoms: It gave itself a new cryptical name, and I can't change it back In most cases I cannot install new software anymore (e.g. I cannot ...
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2answers
4k views

Understanding kernel panic error log

My MacBook Pro worked all normal when all of a sudden it went black. It tried to reboot itself but immediately produced a kernel panic. From then on I was never able to boot again. I could only enter ...
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Is it possible to use diskutil to manipulate the read/write buffer of the SSD portion of the fusion drive?

Has anyone been able to use diskutil to manipulate the Core Storage LVM into increasing the size of the read/write buffer of the SSD? Currently the Fusion Drive keeps 4 GB free for new reads/writes. ...
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1answer
668 views

Messed up 1TB Fusion Drive Partitions (on iMac 5K)

Alright, so I did something stupid today, and I really need some help right now… So kinda like the situation in this post I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp), I messed ...
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How can I manually force a file of a Fusion Drive to the SSD?

From what I understand, the implementation of the Fusion Drive is at the OS level (coreStorage). Yet, I want to know if it's possible to manually interfere in the management for a specific file or ...
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OS X won't start after converting Core Storage to HFS+

I followed this guide to convert my Core Storage partition to HFS+ in order to make my OS X partition visible in Windows 10. Now I can see the Mac partition in Windows but I can't start my computer ...
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4answers
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What techniques for disk, volume and file system management are possible with OS X, but troublesome within Disk Utility?

In the past, Disk Utility was the best starting point for the vast majority of disk-related tasks. As technologies within (or possible with) OS X have developed – without equal development of Disk ...
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How can I delete a partition (coreStorage logical volume?) from the Terminal?

I finally understood why Disk Utility will not change the partitions on my HDD, even though I added the most recent one myself (maybe significant: to test Yosemite DP) with it. Now I see it says it ...
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173 views

What is the purpose of Apple_CoreStorage container on single drive Macs?

I had OS X 10.10. Output of diskutil list was something like this: Upgraded to 10.11. Output of the same command right after: I managed to get it to the previous state by enabling FileVault and ...
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1answer
40 views

Unable to access neither Partition Layout nor Option tab in Partition tab on Disk Utility

I have a problem that I cannot select Option tab in Partition tab as shown in above screenshot. I wanted to convert my external hard disk to GUID partition table. Thank you in advance for your help. ...
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Unable to install El Capitan on my MacBook Pro [duplicate]

I have a MBPR Mid 2014, 8 GB RAM, Core i5 This is how my Macintosh HD looks like: And every time I try to install "El Capitan" final App Store release version I get: "This core operation is not ...
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137 views

What are the advantages or disadvantages to Logical Volume Groups vs traditional partitions

I recently installed a new 3TB hard drive on a Mac Pro (3,1) running yosemite. With other hard disks, I had previously installed the hard disk and then erased in disk utility getting the traditional ...
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60 views

Scripting a Partition Scheme for CoreStorage - Mac

I've read a lot of information about the CoreStorage/Fusion Drive setup. In our environment, we work on a multitude of configurations of Macs, many with multiple operating systems on them. As such, ...
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1answer
105 views

Startup Disk Full: Core File

The storage on my start up disk is being consumed by some kind of core files labeled as cores:1234 (numerical digits change). I downloaded OmniSweeper, which helped me locate these files and aware ...
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679 views

How to mount Core Storage volume under Linux (or force conversion on unrevertible volume)?

I tried to mount HFS+ partition in Linux today, but I had problem with hfsplus: unable to find HFS+ superblock I've found later that this partition is in fact Core Storage container for the logical ...
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35 views

Viewing the progress of a corestorage revert operation?

I'm in the middle of migrating to some newer hardware, and to make this a little bit easier on myself, I'm decrypting my hard drive on the older machine. To do so, I've run: diskutil corestorage ...
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23 views

Can't find storage after fixing EFI system partition error

I followed How to fix the error: "This disk doesn’t contain an EFI system partition"? In the final step sudo dd if=/dev/disk1s1 of=/dev/disk0s1 I cloned an existing ESP from an internal ...
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How can I resize a partition on OSX 10.10.5

I have a Mac with OS X 10.10.5 on a HD which had 4 partitions. Using Disk Utility I deleted one of the 4, intending to slightly grow the 3rd (containing the OS), leaving space for a new partition to ...
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259 views

How do I resize an ex-CoreStorage volume?

I've got a Macbook Pro Retina (with the PCIe drive ‘blade’, instead of a traditional 2.5" laptop drive). I've recently upgraded the internal drive from 500GB to 1TB, and dd'd the old drive over the ...
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123 views

Reclaim SSD space from deleted partition

I have a very similar problem to one that was answered here, but I don't know how to apply the answer to my mac. MacBook Pro 15", Late 2013, 2.3GHz/16GB/512GB, Yosemite 10.10.3 I was attempting to ...
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1answer
65 views

How to recover this damaged CoreStorage PV records?

I have played something following https://www.reddit.com/r/osx/comments/2wzlxc/a_corestorage_primer_aka_why_you_cant_manipulate/ ,like: hdiutil attach -nomount ram://$[2048*1024] diskutil cs ...
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How can I re-allocate the whole space for just one partition? [duplicate]

I'm running OX X 10.10.5 on my MBP with 500GB SSD. When I initially configured the computer I've created a setup with a boot loader so I was able to boot into Linux too. Since I'm using virtual ...