Skip to main content

Questions tagged [core-storage]

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.

Filter by
Sorted by
Tagged with
16 votes
2 answers
15k views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF'

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 : ...
4 votes
0 answers
1k 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: ...
7 votes
4 answers
18k views

APFS with external hard drives (non SSD)

I bought a new external hard drive for my Mac. What is the best file system in 2021 to format the external hard drive? I would like to encrypt the hard drive and I only use it with Macs so I don't ...
4 votes
1 answer
8k 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 ...
0 votes
1 answer
5k 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 ...
0 votes
0 answers
53 views

Inaccessible external volume from Terminal

I've hit a bit of an odd issue with my TimeMachine/external storage backup solution. Do note that I set it up while Apple was changing filesystem management systems (CoreStorage vs APFS vs OS/Data ...
3 votes
1 answer
210 views

Shrinking a Core Storage volume without the booter partition

I have a 14 TB external drive containing a single 14 TB HFS+ encrypted partition (besides EFI). I cannot resize this partition to add a new one. When I tried using either Disk Utility or diskutil, it ...
5 votes
2 answers
13k 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 ...
1 vote
1 answer
2k views

Mac mini FusionDrive - “No CoreStorage Logical Volume Groups Found” [closed]

I can't figure out how to correct this at this point. I’m hoping someone here can point me in the correct direction. I have posted my terminal outputs below for diskUtil list and diskUtil cs list. @...
0 votes
0 answers
95 views

What are the best practices for moving macOS App(s) to an external drive?

I'd like to free up space on my mac's internal HD. I currently run with no external HDs. Seems like one option is to selectively move one or more apps (that I don't use very much), along with their ...
2 votes
2 answers
2k 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 ...
10 votes
6 answers
21k views

DIY Fusion Drive: Adding Recovery HD to a CoreStorage Volume Group

After creating a "DIY Fusion Drive" using the methods below in 10.8, I'm now wondering how to add a RecoveryHD partition to the internal drive. Here's what I did to create a Logical Volume Group ...
2 votes
0 answers
1k views

Cannot mount encrypted time machine drive after unmount

I have an 3TB external HDD with 2 partitions, one of them is 1TB dedicated to time machine (encrypted). It works perfectly, but whenever I unmount the partitions (by using right click, Eject via ...
7 votes
2 answers
12k 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 ...
2 votes
1 answer
16k 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 ...
3 votes
1 answer
1k 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 ...
40 votes
8 answers
70k 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 ...
18 votes
3 answers
6k views

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" ...
1 vote
1 answer
743 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 ...
4 votes
0 answers
117 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 ...
2 votes
2 answers
2k 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 (...
2 votes
2 answers
5k 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 ...
0 votes
2 answers
178 views

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 ...
1 vote
1 answer
2k 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 ...
1 vote
1 answer
1k 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 &...
1 vote
0 answers
98 views

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....
2 votes
2 answers
2k views

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 ...
4 votes
4 answers
8k views

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:
15 votes
3 answers
106k views

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 ...
0 votes
1 answer
2k 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 ...
55 votes
6 answers
23k views

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 ...
0 votes
1 answer
1k 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 ...
1 vote
1 answer
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 ...
1 vote
3 answers
2k 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 ...
0 votes
1 answer
2k 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 '...
5 votes
1 answer
2k 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, ...
10 votes
3 answers
8k 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 ...
0 votes
2 answers
812 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 ...
0 votes
1 answer
829 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 ...
1 vote
0 answers
2k views

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. ...
1 vote
3 answers
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. ...
0 votes
1 answer
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 ...
1 vote
1 answer
2k 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 ...
3 votes
0 answers
125 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 ...
1 vote
1 answer
4k 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 ...
1 vote
1 answer
3k 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# ...
3 votes
2 answers
721 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 ...
2 votes
3 answers
14k 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 ...
5 votes
1 answer
2k 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 ...
2 votes
1 answer
13k 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 ...