Apple's branding of a tiered storage solution where an SSD and HDD are combined using core storage to appear as one fast and spacious drive.

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46
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8answers
18k 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 ...
21
votes
2answers
14k views

How to determine which files are on SSD on Fusion Drive?

My question is: How can i determine which files are on the SSD "partition" on Fusion Drive? I have an iMac with 1TB Fusion Drive, and it would be good to know which apps or data are on which ...
9
votes
3answers
4k 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 ...
8
votes
5answers
18k 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 ...
6
votes
3answers
32k views

I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp)

this is a somewhat similar post to this one (Can't create partition on free space with Disk Utility) but not quite... It started with me creating a BootCamp partition (around 145 GB) for Windows ...
5
votes
1answer
429 views

DIY fusion Drive two identical volumes show up booting with option key?

I've succesfully built a fusiondrive on my late 2009 iMac (256Gb Samung830+2TB HDD). I set the size to 100%, so I have no recovery partion. However when I boot with the option key I get two identical ...
4
votes
6answers
13k views

How can I verify that a DIY Fusion Drive is working as it should?

I installed an SSD in my 2011 Mac Mini to run alongside the stock 500GB HDD. After carefully reading through a number of tutorials, I used Terminal to merge them into a single "Fusion Drive". I cloned ...
4
votes
4answers
799 views

Can I create a fusion drive with an HDD that already has a boot camp partition?

I'm planning to replace the optical drive in my MacBook Pro 9,1 (mid-2012, non-retina) with an SSD and make the two internal drives into a fusion drive, and I know that creating a boot camp partition ...
3
votes
3answers
576 views

Can OS X be installed on the ssd part of the fusion drive?

I am looking at purchasing a mac mini and need to decide on a storage option. I want either an ssd or the fusion drive however I am not sure whether OS X can be installed on the SSD part of the fusion ...
3
votes
2answers
1k views

What is the layout of a real Apple supplied fusion drive?

Would someone who has a fusion drive that they bought directly from Apple please provide diskutil output sufficient to describe the choices they made? I've seen lots of different sets of advice for ...
3
votes
1answer
140 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, ...
3
votes
1answer
977 views

Fusion Drive: free space on SSD

Is there a possibility to find out how much storage is free on a SSD of a Fusion Drive disk (SSD + HDD as a logical device)? The structure I use is this one here: $ diskutil list /dev/disk0 #: ...
3
votes
1answer
1k views

Selecting a SSD for Fusion Drive

My aging Early 2009 Macbook White is getting a bit long in the tooth, so after learning about Fusion Drive, I'm considering combining the existing 500GB HDD with a budget-to-medium-class SSD drive, ...
3
votes
1answer
2k views

OS X Mountain Lion does not boot after the creation of a Fusion Drive

I have followed a guide to set up the core storage logical volume to use one SSD and one HDD. Since then, I have encountered multiple errors such as: 69822 Couldn’t rediscover disk after operation ...
3
votes
1answer
3k views

Restoring Fusion Drive after error on partition erase

I think I'm lost and need some help with my Fusion Drive. I have new iMac Retina 5k with 3TB Fusion Drive and preinstalled Yosemite. Things I did so far: I was working on my iMac and had ...
3
votes
1answer
576 views

Is there a way to change order of physical disks in Corestorage

I upgraded existing system to a "Fusion drive" - corestorage volume - consisting of existing 300GB HDD and new 120GB SSD. Instead of creating a new corestorage drive I went with the route of ...
3
votes
1answer
4k views

Name-error when formatting NTFS on OS X 10.8.4 using “diskutil” (Terminal)

I have a 2011 Macbook Pro 13 inch - OS X 10.8.4 (Mountain Lion), which i upgraded with a SSD. I installed the original HDD as second drive instead of the optical. I need to change the filesystem for ...
3
votes
2answers
266 views

FusionDrive seems to not use SSD

I'm trying to make a homebrew FD of 500GB HDD and 128GB SSD. I'm using Maverics 10.9.1 and MD101 MBP. What I did was: install HDD into superdrive bay install SSD into HDD compartment use diskutil ...
3
votes
0answers
1k views

Fusion Drive with SSD and HHD Hybrid Drive (e.g. Seagate Momentum XT 750 GB with 8 GB SSD): Good idea or plain nonsense?

I’ve seen numerous instructions on how to setup a Fusion Drive from your own SSD and HD, e.g. Can I make a DIY Fusion Drive? Very silly question: How would a Fusion Drive built from an SSD and a ...
2
votes
1answer
10k views

diskutil shows Macintosh HD is missing (with Recovery HD occupying the entire space)

So yesterday I managed to screw up my iMac 2012 (with Fusion Drive) by installing the Mac OS X 10.10.2 update... The installation stalled and when I tried to restore from an external drive using Time ...
2
votes
2answers
3k views

Upgrading to SSD on 2010 MBP

I have a mid-2010 MacBook Pro, which I want to upgrade with an SSD in the Optical Drive slot and create a Fusion Drive (using the Terminal diskutil command in Recovery Mode) and then re-install OS X ...
2
votes
2answers
56 views

Reuse an iMac's fusion drive?

I have a 2013 iMac with a broken logic board and display. It's too expensive to repair, but I'd like to salvage the fusion drive. If I put the drive in an external case will it work?
2
votes
1answer
662 views

Messed up 1TB Fusion Drive Partitions (on iMac 5K)

Alright, so I did something stupid today, and I really need some help right now… So kinda like the situation in this post I think I messed up the Fusion Drive on my 1TB iMac (with BootCamp), I messed ...
2
votes
1answer
13k views

Why does Apple recommend a 2TB FD over a 1TB Fusion Drive for iMacs with 32GB of memory?

Under the 'Choose Storage' section on Apple's iMac configuration page there is a blue link titled 'How much storage is right for you? (Choose Storage) '. In that dialog it says: For the best ...
2
votes
2answers
1k views

Does a Boot Camped Windows alongside a Mac OS X partition profit from a Fusion drive like Mac OS X does?

While writing an answer to this question Should I defrag my SSD before creating a partition for Boot Camp? i wondered if a Boot Camped Windows profits from a Fusion drive like OS X on the same drive ...
2
votes
1answer
1k views

The full size of the Fusion Drive is not available for repartitioning

Any help would be greatly appreciated, I've found so many similar questions but none that match mine exactly. I created a partion on my 2013 iMac in order to test out the Yosemite upgrade. I decided ...
2
votes
2answers
1k views

Boot Camp does not boot after disk cloning

I've got a MacBook5,1, and I replaced the CD drive with a SSD. Then, I made a "DIY fusion drive". Before doing it, I was using the regular setup, with Boot Camp. Then I put the SSD and made the Fusion ...
2
votes
5answers
2k views

Can not delete Free Space on iMac 5K: Partition doesn't appear in CS list

I recently tried to install a bootcamp instance of Win 8.1. The install failed for some reason (wasn't clear from the error message). This left me with an unaddressable partition. I erased that ...
2
votes
2answers
581 views

Fusion Drive constantly spinning up and down

I've got a 1TB Fusion Drive (with a Seagate 7200 rpm hard drive) in a Late 2013 27" iMac. While the iMac is asleep, the hard drive spins up and down every minute or so (without fail), creating an ...
2
votes
2answers
286 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
2answers
2k views

Can I use a mSATA drive to create a Fusion Drive in my iMac?

I have a Samsung MZ MPA1280/0D1 128 SSD mSATA drive. Can I use this to create a Fusion Drive in my 2011 iMac 27" and, if so, what cable will I need in order to connect the mSATA drive properly?
2
votes
2answers
2k views

How do I see disk usage within a Fusion Drive (CoreStorage Logical Volume)?

I just created a "Fusion Drive" on my MacBook Pro by following "How to make a Custom CoreStorage Drive in OS X". It was created with a 256GB SSD and 320GB HD, with the SSD set as the "primary" disk ...
2
votes
0answers
26 views

diskutil fails to fix Fusion Drive

My iMac suddenly stopped booting, failing to mount the disk at boot. Running diskutil repair fails with this error: bash-3.2# diskutil repairVolume disk3 Started file system repair on disk3 ...
2
votes
3answers
199 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 ...
2
votes
1answer
417 views

Can't delete Logical Volume Group on Fusion drive

I have a 2014 iMac Retina running OS X Yosemite and a 3TB Fusion drive. I am attempting to restore it from a Time Machine backup, but when I try to do so, I get the error message, "The disk can't be ...
2
votes
1answer
167 views

Should I create a Fusion Drive before or after downgrade (from Yosemite to Mavericks)?

I bought a used Mac Mini late 2012 with installed Yosemite and two drives: SSD 128 GB and HDD 500 GB. I want to create a Fusion Drive and downgrade to Mavericks via bootable USB flash drive. What ...
2
votes
0answers
316 views

How do I troubleshoot appalling write performance on DIY Fusion Drive? [closed]

I recently bought a 120 GB OCZ Vertex 3 and stuck in my 2009 Macbook White, together with a optibay-adapter for the old 500 GB HDD and configured them as a corestorage "fusion drive" by using the ...
2
votes
0answers
1k views

Fusion Drive Setup: Possible to force the HDD to spin down as long as your reading from/writing to the SSD?

I'm considering to replace my optical drive in my MacBook Pro with an SSD. When using it as separate Volume, the advantage is that you can spin down the HDD, thus reduce noise and first and foremost, ...
2
votes
0answers
263 views

Unable to create a DIY Fusion Drive using a 3 TB hard drive [closed]

I'm trying to make a Fusion Drive with a Samsung 830 256GB SSD and a 3 TB 3.5" HDD (connected via SATA to my late 2012 Mac mini). I'm able to create the Fusion Drive, but when I start to install ...
1
vote
1answer
580 views

Fusion-drive on OS 10.7

I have a new iMac, but I need to revert back to OS10.7 for software compatibility issues at work. Will the fusion-drive function properly?
1
vote
2answers
3k views

Made DIY fusion drive… now recovery partition won't boot

diskutil list shows what I am fairly certain is the correct layout. The recovery partition is "outside" the core storage logical volume group on the rotational disk: % diskutil list /dev/disk0 ...
1
vote
2answers
129 views

Fusion drive is not working although the system can find the SSD

I own an iMac late 2013 with a fusion drive. Recently I installed Windows 8.1 using Bootcamp on a separate partition on my disk. After a few days, the booting process of OS X started failing and I had ...
1
vote
1answer
110 views

What's wrong with my Fusion Drive?

I'm having weird issues with my internal Fusion Drive. Symptoms: It gave itself a new cryptical name, and I can't change it back In most cases I cannot install new software anymore (e.g. I cannot ...
1
vote
1answer
2k views

Is Mac Mini's Fusion drive useful if I mostly use windows 8 through Bootcamp?

I am considering of buying a Mac Mini with a 1TB Fusion Drive. However I will rarely use OSX (except for iPhone application development) and will mostly be running Windows 8 through Bootcamp. In this ...
1
vote
2answers
3k views

Windows will not boot to my boot camp partition on a DIY fusion drive - gives “No bootable device found” error

I have a MacBookPro 9,1 (mid-2012, non-retina) running OS X 10.8.2. Here is what I have done to my system: Installed Windows 7 x64 Pro to a boot camp partition; installed all windows updates. Using ...
1
vote
3answers
12k views

“No Bootable Device” after failed Boot Camp installation (Windows 8 - 1TB Fusion Drive)

On my new iMac /w a 1TB Fusion Drive, I tried to install Windows 8 (still technically unsupported) using the following method: ...
1
vote
1answer
20 views

Fusion drive: replace SSD and HDD vice-versa

I've just made a Fusion Drive on my MBP 2012 and restored data from the Time Machine. Unfortunately, right now I read information that the best place for SSD is the main bay of HDD not the optical ...
1
vote
1answer
2k views

Fusion Drive seems to be messed up

I felt that my iMac late 2012 became pretty slow, above all after login. Now when I look into disk utility, it seems that my disk doesn't behave as Fusion Drive any more: An output from terminal: ...
1
vote
1answer
1k views

Upgrade to Yosemite with two hard drives in iMac

I'm running 10.9.5 on an iMac, where I have two hard drives (SSD + HDD) and Superdrive installed. The way the disks are mounted is not conventional: /dev/disk0s2 on / (hfs, local, journaled) devfs on ...
1
vote
0answers
76 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 ...