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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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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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53 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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106 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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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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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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288 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 ...
2
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1answer
320 views

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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62 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 ...
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32 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....
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1k 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. ...
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277 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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59 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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570 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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133 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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470 views

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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70 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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978 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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1k 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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171 views

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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371 views

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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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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110 views

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 ...