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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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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37 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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1answer
40 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
77 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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45 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
2k 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
49 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
102 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
140 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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1answer
193 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
69 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
82 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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29 views

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
278 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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51 views

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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81 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 ...
2
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1answer
144 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
35 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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13 views

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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90 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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48 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
72 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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360 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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30 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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21 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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3answers
2k views

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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495 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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1answer
96 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
51 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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7 views

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 ...
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1answer
326 views

Unable to restore/reinstall/erase from recovery

I've just tried to install the El Capitan GM, which failed half way through with the error "This Core Storage operation is not allowed on a sparse logical volume group" and gave me the option to ...
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48 views

Un-partition Core Storage MacBook Pro disk

I'm having serious issues with my MacBook Pro. For some reason it has been partitioned odd and I no longer have access to the recovery partition when holding the option key. I had a look at the ...
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2answers
206 views

Unable to repair hard drive - due to volume assignment problem?

Disk utility and fsck [terminal] both agree that there is problem with my HD. I am curious if someone can help me figure out how I can deal with the problem. Terminal - Normal Mode MacBook-Pro:~ ...
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1answer
149 views

Why can I only have 2 partitions on my 3TB Apple Fusion Drive?

According to Apple, I can only have 2 partitions on my 3 TB Fusion Drive. I do not understand why. Techtool Pro made an eDrive, their emergency boot drive, and Apple made their Recovery HD. It ...
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1answer
273 views

Apple MacBook Pro 2013 with 512Gb SSD cannot install OS X

I had an issue running an App and the vendor suggested I should revert to the earlier OS X 10.10.3. I located on Time Machine the backup version I needed, waited for the format and restore. I then ...
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1answer
81 views

How to rename (main) hard disk back to default? And is the disk default really LVG?

I recently reinstalled OS X, when it asked me to erase the disk I just left it Untitled, since there's no instruction to rename it to whatever on this Apple support page, after restoring with Time ...
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2answers
144 views

Logical Volume Group 17gb “Available Space”

Can anyone help explain why there is 17 GB worth of free space on my LVG I can't seem to do anything with this space. Is there anyway to fix this? I have already reformatted the disk then cloned the ...
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238 views

Broken fusion drive - SSD size is 0B and 'No CoreStorage logical volume groups found'

Some context first: I have late 2012 iMac 27" with 1TB fusion drive. Some time ago, for whatever reason, the SSD drive became visible in Disk Utility. I happily used the drive for Yosemite and ...
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1answer
78 views

Cannot partition Macintosh HD

Pre P.S. From what I read online, sharing your UUID is not really a security issue, but if I just basically shared my social security number, please do tell. Before I ask this, I'm a PC person and ...
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1answer
857 views

Why does Disk Utility show “Macintosh HD” on both Logical Volume Group and the volume underneath?

After performing a clean install of Yosemite (erasing the entire disk using disk utility during installation), the original name of the disk (APPLE HDD HTS547575A9E384 Media) turned out to be ...
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2answers
907 views

How do I repartition my Mac to get rid of my dual boot setup?

I setup dual boot on my Mac (with Ubuntu) and want to get rid of it. The Disk Util GUI shows me: However attempting to remove the disk0s4 or disk0s5 partitions results in: Could not unmount ...
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1answer
713 views

Can someone explain what 'diskutil cs revert' does?

so I was following some instructions to get my windows bootcamp partition to resize in disk utility, because after upgrading to Yosemite I was unable to resize my partition to give one side more space ...
2
votes
1answer
2k views

Restoring Fusion Drive after error on partition erase

I think I'm lost and need some help with my Fusion Drive. I have new iMac Retina 5k with 3TB Fusion Drive and preinstalled Yosemite. Things I did so far: I was working on my iMac and had ...
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0answers
74 views

Partitioning a Hard Drive using “Logical Core Volume Group”

I have a series of scripts I use for repartitioning hard drives before a DeployStudio reimage. They're really simple: #!/bin/sh diskutil partitionDisk /dev/disk0 GPT JHFS+ Mac\ OS\ 10.10 100g JHFS+ ...
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Impossible to join free space on main Machintosh HD [duplicate]

I've removed Windows deleting the partition because from BootCamp Assistant it gave me error that couldn't partition the disk. The problem is that now I have 100 GB of free space (which are from the ...
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2answers
314 views

Reclaim disk space from old Windows partition?

How do I reclaim the disk space used by my former Windows partition? Clear free space in Disk Utility So I recently removed Windows 7 from my iMac, but Bootcamp didn't let me do it. I used Disk ...
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0answers
462 views

Is it safe to convert Core Storage partition to HFS+?

I just got my new Macbook Pro, I tried to make two new partitions using Disk Utility but I could only create one. After googling I found out that I can't create more than one additional partition in ...
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3answers
4k views

I can't shrink my OS X Yosemite partition [duplicate]

I recently reformatted my machine and am trying to shrink my OS X partiton to make room for a linux partition, following instructions at http://www.makeuseof.com/tag/install-linux-macbook-pro/ . I am ...
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1answer
2k views

Fusion Drive seems to be messed up

I felt that my iMac late 2012 became pretty slow, above all after login. Now when I look into disk utility, it seems that my disk doesn't behave as Fusion Drive any more: An output from terminal: ...
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2answers
258 views

Resize FusionDrive to fill empty space?

Context: I wanted to install Windows 8 onto my Mac by repartitioning my FusionDrive. Using the partition BootCamp provided didn't work, so I found a "solution" on Apple forums to create empty space ...