Creating A Fusion Drive Mac Os

For years, early adopters and beta testers would partition their Mac's hard drive in order to test a new or beta version of macOS. Partitioning your hard drive actually creates a separate container on your hard drive that is limited in its abilities.

1. Mac Mini Fusion Drive
2. Where Is Mac Os On Fusion Drive
3. Create Fusion Drive Mac Os Sierra

If your Mac uses APFS, you can actually create a volume right on your current hard drive instead. This allows your hard drive to manipulate your available storage temporarily as you need it. It makes testing new or beta operating systems much easier to do and easier to remove when you're done testing them out.

IMPORTANT: The developer beta of Big Sur is currently experiencing some issues with installing and updating versions including and most importantly, installing Big Sur onto separate volumes.

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From Apple's developer support notes for Dev beta 2:

You might be unable to install macOS Big Sur 11 beta onto additional volumes. (63677460, 64445236)

Dec 29, 2016  How to create Fusion Drive from SSD and HDD on Mac This tutorial help you to merge 2 hard drives (SSD+HDD) so your computer think that is just one.

If macOS Big Sur 11 beta is installed into the same APFS container as previous versions of macOS, system software updates can no longer be installed on the previous versions of macOS. (64411484)

If you are installing the developer beta of macOS Big Sur, we highly recommend going with partitioning your hard drive not creating a volume.

Before you start

The most important thing to do before making any changes to your hard drive is to back it up. Seriously. Back it up. Please. Time Machine is the easiest way to back up your data if you don't already have another system in place.

Second, make sure you have enough free disk space to properly run a secondary operating system. Shoot for at least 30GB free, though I recommend closer to 50GB if you have it available.

What's the difference between a disk partition and a volume?

A partition and a volume act in very similar ways, but creating a volume allows for flexibility of storage needs while creating a partition separates storage with a specific amount and does not adjust for each drive's needs.

What is a partition?

Partitioning your Mac is basically splitting your hard drive into separate, usable systems. It makes it possible to run two separate operating systems on one device, like Windows and macOS, or two versions of macOS (like Catalina and Big Sur).

Note: If you want to run Windows on your Mac, Apple's Boot Camp assistant will automatically make a partition for you. Here's how to install Windows.

It is important to note that partitioning your hard drive also splits up your available hard drive space. Each partition will take up a portion of your usable storage. So, if you are running low on storage capacity on your hard drive, we don't recommend partitioning.

If you are running a Mac using HFS+ file system (prior to macOS Catalina) you must partition your hard drive. If your Mac uses APFS, Apple recommends creating a volume instead.

What is an APFS volume?

An APFS volume creates a similar container to be used the same way as a partition, but it mounts it within your main hard drive. This allows the volume the flexibility to grow or shrink in storage size as needed. You don't have to worry about running out of temporary space while installing macOS, for example, because it will grab the necessary space from your main drive and then put it back when it's done. You can manually select size limiters for a volume if you're worried about one drive overtaking another's space.

If your Mac uses APFS, Apple recommends creating a volume instead of a partition.

How to add an APFS volume on Mac

You can test the beta of Big Sur on your Mac without having to change anything on your daily driver by creating a volume that acts as a separate drive so you can install a completely different operating system. This allows you to switch between OSes using the Startup Disk option.

1. Open Finder from your Mac's dock.

2. Select Applications.

   Source: iMore

3. Scroll down and open the Utilities folder.

4. Double-click on Disk Utilities to open it.

   Source: iMore

5. Select your APFS drive (Should be called Macintosh HD) from the sidebar.

6. Enter a name for the volume.

   Source: iMore

7. Select the type of APFS format you want. I recommend just APFS.

8. Click Add.

   Source: iMore

You have the option of selecting a specific size that you want the volume to be, which will guarantee this volume will always have the reserve size you want. However, APFS volumes are designed to allocate disk space as needed. If you're worried about running out of disk space on either your main drive or the new volume, you can select a minimum/maximum volume size. After completing Step 7 above:

1. Click Size Options.
2. Enter a Reserve size to ensure that the new volume will always have a minimum amount of space.

3. Enter a Quota size to ensure your main drive never runs out of space.

   Source: iMore

4. Click OK.

5. Click Add.

   Source: iMore

How to create a partition on your Mac

1. Open Finder from your dock.

2. Select Applications.

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   Source: iMore

3. Scroll down and open the Utilities folder.

4. Double-click to open Disk Utility.

   Source: iMore

5. Select your hard drive in the Disk Utility window. It will be the first drive on the list. It might be named 'Fusion,' or 'Macintosh HD.'
6. Click on the Partition tab. You will be prompted to either add an APFS volume or a Partition.

7. Click Partition.

8. Click the Add partition button it looks like a plus (+) symbol.
9. Change the size of the partition you wish to use by dragging the resize controls. The used space is represented in blue.
10. Name the new partition.
11. Specify which file system format you want to use. If you're running macOS 10.13 or higher, you'll want APFS. If you are running macOS 10.12 or older, you'll want Mac OS Extended.

12. Click apply.

Disk Utility will check the disk and make changes. This will take several minutes.

How to switch partitions or volumes

You can switch to the new partition, install the current macOS, and then download and install macOS Catalina from there.

1. Click the Apple icon in the upper-left corner of your screen.

2. Select System Preferences from the drop-down menu.

3. Select Startup Disk.

4. Click the Lock in the lower left corner of the window to unlock and make changes.

5. Enter your system admin password.
6. Click OK.
7. Select your partition drive.

8. Click Restart.

You can also restart your Mac and press the Option Key when you hear the startup chime. This will take you to the Startup Manager and you can select your drive from there.

You will then be asked to install macOS. This will install the latest available macOS onto the partitioned hard drive. You may have to install an older version of macOS before updating it to the more recent version you want to run.

If you are testing a beta version of macOS, you'll first install whatever the current version is. Then, you can then install the macOS beta.

How to download the beta of macOS Big Sur

Once you've updated your partitioned Mac with macOS Catalina, you can download and install the beta of macOS Big Sur. For the developer beta, you need a developer account and some patience. Developer betas are often a bit complicated to install. We've got a guide to help you out.

Any questions?

Do you have any questions about installing a partition or downloading a new operating system onto a partitioned drive? Let us know in the comments. If you're having trouble partitioning your hard drive, be sure to check out our forums for help!

Updated June 2020: Updated for the developer beta of macOS Big Sur.

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The new Mac Minis have super fast SSD Drives. I measured read times of 2500MB/s which is 5 times faster than the SSD drive in my old mac mini. But these drives are super super expensive. (An extra US$1400 for a 2TB drive). So I thought it might be an option to buy a Mac Mini with a small internal drive (256GB) and add an external SSD drive and combine them into a fusion drive. It didn’t work! But I thought I ‘d write a post in case anyone else has the same idea.

Disk Speeds

Here are the read speeds of various drive configurations measured with Black Magic disk test:

Old Mac Mini (2012):

Internal SSD drive: 480Mb/s:

New Mac Mini T2 2018:

Internal SSD: 2500Mb/s

External (USB-C) SSD: 530Mb/s

The new Mac Minis are much faster, but I was interested in the speed difference between the internal SSD and external SSD. It is so significant that this would be an ideal situation to make a fusion drive. A fusion drive was designed by Apple to ‘fuse’ an SSD drive to a slower spinning drive to ‘speed it up.’ The writes are done to the SSD, and the most used files are kept on the SSD. Then files are copied between the SSD and the slower drive in the background. So imagine being able to make an Fusion drive with a fast and a slow SSD.

Making a Fusion Drive.

Here’s how I made a fusion Drive:

Firstly I had to boot from the internet recovery partition. (Reboot and hold down Apple-R).

I plugged in my Samsung T5 drive and combined with the internal SSD drive of the Mac Mini to form a new Fusion Drive. The Fusion Drive is blank so you then need to reinstall OS X onto it. The instructions are here:

https://support.apple.com/en-au/HT207584

and here:

Mac Mini Fusion Drive

In summary, firstly you need to run this command below to find out the names of your drives:

diskutil list

Then you combine both drives into one substituting the numbers that you found above :

diskutil coreStorage create FUSION /dev/disk1 /dev/disk2

Then you need to create the drive volume:

diskutil cs createVolume logicalvolumegroup jhfs+ Macintosh HD 100%

After that you just format the drive as APFS, and install OSX. This gives the Fusion Drive a recovery partition and everything ready to go.

What worked, and what didn’t.

Well the drive seemed to work. The Internal Mac Mini SSD drive speed was 2500MB/s. The Samsung T5 SSD was 530MB/s. My newly created fusion drive was 2700!

This is the original internal SSD from the new Mac Mini:

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Not only is the Fusion drive as fast as the Internal SSD (which is what I would expect), it’s actually FASTER!!! The fusion drive must be reading and writing from BOTH drives simultaneously. They had plenty of free space so this makes sense.

So what didn’t work? Well the computer was completely unstable. Random restarts. Crashing halfway through installing OS X. Disk Utility crashing. There was some crazy deep level conflict that meant the Mac just wouldn’t run properly! I rang Apple support and they talked me through splitting and re-makign the fusion drive but it was still unstable.

So in the end I had to split my fusion drive back into two separate drives.

Where Is Mac Os On Fusion Drive

If you use the Mojave command “diskutil resetFusion” to try to fuse 2 SSD drives it says that you can only create a Fusion drove from an SSD and a HDD.

Conclusion

With PCIe hard drives been so expensive it makes complete sense for Apple to allow Fusion drives made with a PCIe SSD combined with slower cheaper SSD. I’m not sure why this didn’t work. IF you try to make a fusion drive in Mojave with the Apple say they only support fusion of an SSD with a Hard disk drive.

Create Fusion Drive Mac Os Sierra

I’d love to hear if anyone else has had success with this. Leave message below if you do!

UPDATE 13th Jan 2018: Yesterday I tried making a fusion drive from the internal Mac Mini drive and an external Seagate FAST SSD drive. It worked flawlessly installing Mac OSX up until the point where I rebooted, then it went into an endless repeating grey screen loop and never got to the desktop!