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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.

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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
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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 ...
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1answer
38 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
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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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Core Storage Missing

I was trying to install Windows via BootCamp. But it showed an error and Bootcamp started to restore the partitions it created. But the process never finished so I had to quit BootCamp. I found out ...
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1answer
205 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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1answer
64 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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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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1answer
2k 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 ...
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Extend a macOS partition

BACKGROUND: I have a 2011 MacBook Pro, on which I created 4 partitions: 1 - Snow Leopard OS (original) 2 - partition containing shared data 3 & 4 - partitions containing the latest macOS and the ...
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276 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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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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1answer
2k 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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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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627 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: ...
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1answer
945 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 ...
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1answer
207 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 ...
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1answer
415 views

Hardrive will not mount after deleting Linux partition. Can’t boot into Mac OS X [duplicate]

I tried to delete a Linux partition on my hard drive. My hard drive was no longer bootable and the type turned into FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF. I tried to follow some of the other ...
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1answer
4k 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 : ...
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1answer
154 views

Where did my CoreStorage partition go?

I have a 2015 MacBook Air 128GB with Sierra Recent purchase as new from Apple, still under warranty). A couple of months ago I was looking at the SSD using DiskUtility and saw that the SSD seemed to ...
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My question is about recreating Corestorage partitions - formatted Fusion drive

I have an iMac 27" with a Fusion Disk (SSD 121 GB, HDD 1 TB) and Mac OS X 10.7 (Lion) installed. The HDD failed and the Fusion Drive is lost (Lions recovery diskutil: disk missing - fix/ignore) ...
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1answer
191 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 ...
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242 views

CoreStorage volume not journaled

I have an interesting case on an iMac. It has a fusion drive and at some point it stoped booting up. Booting up in single-user mode, I tried to mount the boot partition but it gave an error "...
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4answers
3k 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:
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iMacs Fusion Drive: only SSD listed, no HDD

I had some problems with a Mac's Fusion Drive. I erased the first MB of the SDD (Terminal in recovery mode). After that I partitioned the SDD again (with GUID). That works. But the HDD is now missing. ...
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1answer
45 views

How do I consolidate all my partitions into one partition usable for Bootcamp?

I've been having an issue with Bootcamp recently after I deleted my Windows disk due to a driver issue that was unfixable. I figured I would just do a fresh install of Windows, but little to my ...
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0answers
17 views

Unable to unpartition main hard drive [duplicate]

I have a late 2013 27 inch iMac with a 3 TB Fusion Drive with macOS Sierra installed. I partitioned my drive right down the middle, so 1.5 TB on either side. When I went into Disk Utility mode to ...
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1answer
709 views

How do I print my logical volume group UUID to file?

I'm in the process of trying to automate getting the LVGUUID and printing it as a string to a text file, or better piping it in terminal to other commands. All I can do right now is diskutil ...
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1answer
185 views

How do I merge the 8 GB of “free space” on Macintosh HD under Logical volume group into Macintosh HD?

I did some partitioning using bootcamp 6.0 to install windows that left a 8 GB of free space with cannot be restored normally, How do I get it back? The diskutils cs list shows: Last login: Sat Jul ...
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0answers
56 views

macOS partition accessible but won't boot

I have a MacBook Air 2013 with macOS Sierra 10.12.6 installed. When I press the power button, the flashing folder with question mark appears. I've started Internet Recovery (in the startup disk ...
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262 views

Data Recovery options for iMac late 2013 1 TB Fusion Drive

My friend's iMac crashed. He took it to an Apple Store and they said the 1 TB HDD was failing. They got him to boot off an external and told him to go home back his stuff up and they can order and ...
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1answer
73 views

Many 0.1 -6 mb + disk images on running “diskutil list”under “Recovery HD”. Is it normal?

There are about 10 of 7 of them and are images extremely small.Is it the requirement of system or the leftovers after formatting disks having other OSes?
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disk data apparently throttled after five minutes' idle time during reversion (converting (backward)) from Core Storage)

With pre-release build 17A264c of 10.13 (macOS High Sierra) and 10.12.5 (Sierra) : after five minutes' idle time, the throughput drops to less than 4 MB per second (data written, reported by ...
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2answers
189 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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369 views

Cloned disk with dd, but it won't mount?

Goal: clone my internal disk to an external disk, and boot from the external disk. update thanks klanomath, who pointed out that I had to change the uuid of the core storage disk for both the ...
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1answer
275 views

Remove Linux partition on Mac. CoreStorage problems

I have a Macbook pro 2015 with a 256 GB SSD and a Linux partition. I would like to remove the partition. Following the steps written in here, I got stuck in the Modify step. Once I execute the command ...
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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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2answers
879 views

Strange virtual disk. Delete or leave?

I have two virtual disks: Main macOS disk Bootcamp windows disk When I use diskutil listin command line, it shows me: So what the /dev/disk1 is? Should I delete it? And what is EFI EFI disk0s1 is? ...
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1answer
640 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
1k views

iMac disk partion FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF and fusion drive unlinked

I was trying to uninstall linux mint and was trying to restore the partitions back to one. Somehow I ended with the one of the partition labeled FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF. This are the ...
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1answer
227 views

After Changing Partition Type From FFFF I Can't Boot

I originally asked the following question: Partition Type: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF Macbook Pro about how to change my partition type from an unknown to a normal one, since it was ...
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1answer
1k views

How do I re-fuse an unfused Fusion Drive, ideally without formatting?

I have a 5k iMac with a Fusion Drive. I had trouble with macOS, so I reinstalled it, and restored from a Time Machine backup using Migration Assistant. After that, the system has been very slow, and ...
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1answer
473 views

Unable to boot - facing stop sign; Virtual Whole Storage needs repair; Time-Machine cannot find restoration disk destination

Dear respected experts, I have a MBP Retina 2015 (Yosemite). I tried to partition my Macintosh HD ( internal 1TB SSD) disk (by splitting into half). It seemed to have split but has given me some ...
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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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1answer
685 views

My Fusion Drive unlinked in two pieces (SSD+HDD) and I want to restore it again in one piece

i have an iMac 27′ late 2012 and I have a problem with my Fusion Drive … suddenly the SSD part and the HDD unlinked and now i have two separate disks .. I ran in Terminal: diskutil list and diskutil ...
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108 views

Alignment errors on Fusion Drive caused by differing block sizes?

I have some alignment errors on my Fusion Drive after? reorder the CoreStorage. For some weeks ago I got my purchased iMac 27 and made out, that the index order of the SSD and HDD drives are wrong. ...
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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
138 views

I want to triple-boot Lion, El Capitan, and WIndows. Howto?

I have a late-2011 MBP that currently has two operating systems on it. Those two operating systems were Windows 7 and Lion, for a long time. However, I have to use Yosemite (or newer) for some ...
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1answer
222 views

Expand OS X partition

I am using a Mac (OS X 10.10.3) that has a Windows and an OS X partition. From Windows, I shrunk the Windows partition using diskmgmt.msc freeing up about 60 GB. I would like to expand the OS X ...