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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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999 views
Is there a way to manually repair a CoreStorage volume?
I was playing around with CoreStorage on a test disk and used the undocumented commands cs addDisk and cs removeDisk. The addDisk command worked just fine and was able to expand a logical volume group....
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CoreStorage encryption fails - Is it possible to have multiple encrypted partitions on an external drive?
I have a 2TB WD MyBook Studio drive connected via FireWire to my MBP. What I would like to have is two encrypted partitions. So what I do: Disk Utility > Partition and then right click on each ...
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Where does a Fusion Drive store Time Machine local backups? Should I disable local backups?
Time Machine in OS X does store local backups (snapshots) on the local harddrive if you have Time Machine enabled.
Even if you backup regularly, the size of the local backups increases steadily. In a ...
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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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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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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 ...
