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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 can I delete the extra CoreStorage logical volume from the Terminal on my Hackintosh?

I am running main OS on SSD, I also have a few other sata HDD, recently I can't even open the 3TB drive. When I want to go to Disk Utility to repair the disk I get this error: "A CoreStorage logical ...
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2answers
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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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1answer
12k views

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 your ...
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1answer
330 views

Hard-Drive Storage size issues after partition Disk Utility

I wanted to create a partition on my iMac for Windows to be able to play Windows games. I have used Disk Utility to create a 20GB partition on my 1,12TB Fusion drive. This caused a problem on my ...
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8answers
64k views

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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3answers
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Difference between enabling Time Machine's “Encrypt Backups” option, and encrypting from Disk Utility?

I'm setting up Time Machine backups on a new external hard disk. I chose to first encrypt the disk via Disk Utility: But I also see these options: Is there any difference between an "Encrypted" ...
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1answer
83 views

Can't resize partition [duplicate]

My Disk Utility is showing me some Weird Stuff. My current startup partition is showing as 155 GB, with (I was shocked to discover) 344 GB of unpartitioned free space: I can try to resize the first ...
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51 views

Accidentally overwrote encrypted external drive (Mac OS)

So I was rushed (and being careless) and accidentally copied about 80 MB of a Raspberry PI image (SD card formatted extfs) over my external USB drive (4TB) that was formatted and encrypted (using Disk ...
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2answers
909 views

APFS Volume not claiming available APFS Container space

I'm at my wit's end with this, and I can't find anything about it in documentation or questions, so I thought I'd ask one. I had an APFS Fusion Drive that included two drives: (120+500) GB. I cloned (...
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2answers
2k views

How can I *unlock* a CoreStorage logical-volume without mounting it?

I had a damaged disk that's encrypted with CoreStorage / FileVault. DiskWarrior was unable to operate on it while encrypted, obviously (“This is an offline, unavailable Core Storage disk.”); but the ...
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Need Help Fixing Partitioning after Deleting Core Storage Booter and Windows

I know there is a plenty on the Internet, but I am afraid to touch it since the data on my partition is valuable for me now. My situation: I have MacBook Air with OS Yosemite 2011 11" (128G). I ...
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1answer
283 views

How to fix CoreStorage not mounting? Broken GPT, GUID, volume etc?

I have an external hard drive with two partitions, each one formatted as "OS X Extended (Journaled, Encrypted)". The second partition mounts and asks for a password, but the first one does not. The ...
2
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1answer
137 views

unlock macOS encrypted Volume on linux

How can i unlock a Partition that has been created and encrypted using Apples Disk Utility on a linux machine? There are 2 formats one can encrypt Volumes with Disk Utility : CoreStorage encrypted ...
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1answer
402 views

My Fusion Drive Partitioning Seems Wrong/Strange/Wonky

See below for diskutil list of my 3TB fusion drive (iMac 27" late 2014) running High Sierra: I assume disk0 is the HD and disk1 is the SSD, and disk2 is the virtual combo that is mounted as my "HD". ...
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Is it possible to cancel the revert core storage operation?

Something is off here. I issued diskutil cs revert /dev/disk6 and in the second, my macmini's USB controller stopped working and hard ejected (like pulling their plugs) all other attached USB devices....
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2answers
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How to Make OS X Partition Smaller?

System: SIP disabled, Macbook Air 2013-mid, about 120 GB SSD, 8 GB DDR3. My current disk state OS X portion I want to decrease OS X portion and move it to other but trying to startup partion, I get ...
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4answers
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CoreStorage logic volume failed to mount

I have an encrypted hfs+ external SSD. When I plug it into my mac and, it prompts for my password, but after I enter it nothing happens. I tried this in terminal:
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3answers
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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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1answer
179 views

How to properly remove a Linux partition without messing up your drive?

I know this seems like an beginner / dumb question, since an obvious answer would be: Open Disk Utility Remove Linux partition However it seems that it might not be that easy, and that following ...
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1answer
5k views

Is it OK for Time Machine to take a long time to decrypt a freshly formatted encrypted disk?

I'm new to Time Machine. I just this week got an external hard disk and am starting to use it. My Time Machine backups were spending a significant amount of time in the encryption phase. Upon reading ...
0
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1answer
3k views

Windows can't see “Macintosh HD” under Boot Camp

I bought a new iMac (Retina 4K, 21.5-inch, 2017, with macOS High Sierra 10.13.5) and used Boot Camp to install Windows 10 on it. The Boot Camp drivers seem to have been installed successfully, and ...
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6answers
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Can I make a DIY Fusion Drive?

I have a Mac Mini with two drives: a 256GB SSD and a 500GB HDD. From what I've read, the new Fusion Drive does all of it's magic in software, using the Core Storage APIs. Can I get my setup to ...
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1answer
771 views

CoreStorage changed to Apple_HFS after resizing and Recovery HD popped in the middle of my disk

I have a weird thing that happened today on my Mac's disk. I had my main partition Macintosh HD and a 150 GB Linux partition. I tried to split up the Linux partition into two smaller ones using Disk ...
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1answer
2k views

Fusion Drive - Lost space when resizing

I'm having trouble with my Fusion Drive. I was trying to reclaim a 100gb partition that I used BootCamp for. I was unable to delete the BootCamp partition using the Assistant, so I used the Utility ...
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3answers
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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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2answers
1k views

Reverting a CoreStorage Volume

I broke an installation of Deep Freeze on a Macbook by upgrading it to El Capitan. I'd like to get Deep Freeze to work again, but "This version of Deep Freeze cannot be installed on a Mac that has ...
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1answer
1k 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
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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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3answers
7k views

What happens when you remove (or lose) the SSD from a Fusion Drive?

After storing data on a Fusion Drive, is it possible to downgrade your Mac to use the hard drive (HDD) by just removing the solid state drive (SSD)? In particular, I was wondering what happens when ...
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2answers
449 views

How does Spotify or Deezer download and store music for offline use on iOS? [closed]

Which component or method do they use to store it? Is there any easier way to store music offline? How can I store those sounds locally so I can use it for offline use? How can I take a song from ...
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1answer
783 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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How can I *unlock* a CoreStorage volume that is not recognized?

I have a 4TB Seagate Expansion Portable Drive with <1 TB data. It's HFS+, GUID Partition, encrypted with File Vault. It was unplugged without disconnecting, and now the disk image does not mount. ...
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3answers
4k views

How to make Macintosh HD size the same as SSD

So today, I tried dual-booting my late 2013 rMBP on El Capitan with Windows 10. I got to the step within Bootcamp where it was partitioning my SSD, and I went ahead and played a game of Super Smash. ...
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1answer
1k views

Is undoing Yosemite's CoreStorage conversion dangerous?

I tried to make an 8 GB partition on my hard drive so I could make it into a bootable drive, like Recovery HD but without the need to redownload the OS, but for some reason Disk Utility wouldn't let ...
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1answer
1k 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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0answers
101 views

macOS El Captain missing disk space on Fusion drive on iMac, missing contents for GPT partition

I was formatting my Fusion drive of 3 TB and unfortunately it seems 1 TB is missing. I tried to search the answer on this forum and found some relevant answers here but my situation is bit different ...
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1answer
2k views

CoreStorage Volume not detected

I had a Linux/OS X 10.11 dual boot configuration and wanted to remove the Linux partitions. I managed to remove them without any issue but when trying to merge the free space with the OS X partition ...
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1answer
2k 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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0answers
821 views

Can't mount encrypted HFS volume

I have an external hard drive that is partitioned as a single encrypted HFS+ volume. Here's what's going on: The volume won't mount, Disk Utility won't repair it. diskutil cs list says: However: ...
3
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2answers
582 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 ...
0
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3answers
13k 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 ...
4
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1answer
1k views

Can't resize partition: “You can't perform this resize unless it has a booter”

I have an external 1TB disk that I use for Time Machine backups that I temporarily added a second 100GB partition to. After deleting the partition, though, I can't reclaim the free space. Disk Utility ...
8
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1answer
6k views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF' [duplicate]

Yesterday, I have tried to delete an Ubuntu partition. Since, my Mac (13", MBPro mid-2014) doesn't boot. Now, I boot on Mac OS copy with an USB. i follow different subject of this forum (like this : ...
2
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1answer
9k 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 ...
5
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2answers
12k views

diskutil coreStorage in Lion fails to create a concatenated LVG, error -69886

I would like to create a logical volume group (LVG) with two physical disks. Issue The command: diskutil coreStorage create LVGNAME /dev/disk1 /dev/disk2 returns: Started CoreStorage ...
2
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1answer
263 views

How to pick a recovery partition to boot into when there are multiple?

I have a Mac Mini with a Fusion Drive. There are two instances of macOS installed on it. One (just upgarded to 10.13) is installed on an encrypted CoreStorage logical volume that spans the SSD and ...
2
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3answers
3k 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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1answer
277 views

Recovery Mode: FireVault psswd unrecognised and CoreStorage not found

Need some urgent help with my unruly Mac (faced with the prospect of erasing my hard drive after 150 days without backup...) Here is the problem that I have. My Mac got quite slow and I restarted it ...
3
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1answer
2k views

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 ...
2
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2answers
227 views

Where are Core Storage instructions stored?

Where are the Core Storage instructions stored? In Kevin White's macOS Support Essentials 10.12, White says The second partition, occupying the final ~650 MB of the disk is an "Apple_Boot" ...

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