1TB Hitachi hard drive (from a Mac mini) and 250GB OWC Mercury Extreme SSD. You need two drives to make a Fusion Drive, and if you want to get the speed boost, one should be an SSD. In our setup. Apple iMac 27' - 9th Gen Intel Core i5 3.7 GHz - 8GB Memory - 2TB Fusion Drive - 8GB Radeon Pro 580X Graphics 9th Gen 6-core Intel® Core™ i5 Processor 3.7GHz 27' 5K Retina Display 802.11 Wireless-AC + Bluetooth 4.2 Wireless Magic Keyboard and Magic Mouse 2. Nov 19, 2019 The methods include starting up from your OS X Recovery HD volume, or another drive that contains OS X. (Please note: If you're checking a Fusion drive, you must start up with OS X 10.8.5 or later. I recommend using the same version of OS X that is installed on your current startup drive.) Boot From the Recovery HD.
Presented as a single volume on your Mac, Fusion Drive automatically and dynamically moves frequently used files to Flash storage for quicker access, while infrequently used items move to the high-capacity hard disk. As a result, you enjoy shorter startup times and—as the system learns how you work—faster application launches and quicker file access.
Fusion Drive manages all of this automatically in the background. And it comes already set up, so you don't have to do anything to make it happen.
Availability
Fusion Drive became available as an option for iMac and Mac mini models introduced in late 2012. Fusion Drive now comes standard on some iMac and Mac mini models, and is a configurable option on others. For even faster performance, you can configure a model that uses only flash storage (SSD).
Learn more
- You can use Disk Utility to add a single macOS partition to the hard disk on Fusion Drive, and that partition will function as a separate volume, not as part of Fusion Drive. Disk Utility then dims the button to prevent additional partitions. If creating a Windows partition, use Boot Camp Assistant instead.
- You can use Target Disk Mode to mount Fusion Drive from another Mac that is using OS X Mountain Lion v10.8.2 or later.
- Learn what to do if your Fusion Drive appears as two drives instead of one in the Finder.
- An external drive can't be used as part of a Fusion Drive volume.
![Fusion Fusion](https://images.techhive.com/images/article/2012/11/fusion_aboutthisma-100012434-orig.png)
It also depends on which version of the OS you're using to make the fusion drive AND the age of the Mac you're running.
I don't know exactly if it is only in Mavericks of if Mountain Lion already supported this in the latest updates, but after creating a Fusion Drive the second hard drive actually contains a recovery partition. Rstudio postgres driver mac os file not found.
For example, this is my FD:
Mac Os Catalina Fusion Drive
*don't mind the disk size as there are windows partitions I removed from the listing
But what you want to pay attention to is the size of both 'Boot OS X' partitions. On the first disk, it is 134 Mb, on the second, it is 650 Mb.
Digging inside the second partition one will find the BaseSystem.dmg hidden from Finder, but visible through Terminal's ls command:
Trying this on an iMac 27' late 2009, the Recovery Partition does NOT show up when holding the Option key. It is good to mention that the iMac late 2009 was built BEFORE Fusion Drives, thus leading me to conclude that part of its BIOS / UEFI system simply doesn't know to look for that particular recovery partition aside the standard one mentioned on the article.
It DOES show up on newer macs that were built AFTER Fusion Drive was available.
![Mac Mac](https://kb.paragon-software.com/wp-content/uploads/2016/03/3.png)
Create Fusion Drive Mac
I hope this helps a bit. =)