Apple's New 'Fusion Drive' Not a Typical Hybrid Drive

Amongst the many new products Apple introduced today, they also announced a new storage option called Fusion Drive. Apple's website describes how the drive works:

With Fusion Drive in your iMac, disk-intensive tasks — from booting up to launching apps to importing photos — are faster and more efficient. That’s because frequently used items are kept at the ready on speedy flash storage, while infrequently accessed items go to the hard drive. The file transfers take place in the background, so you won’t even notice.

NewImage30

Some thought the drive might be Apple's implementation of a Hybrid drive which uses SSD as a caching system, but it appears that Apple's system is distinct. The MacObserver digs into some details and clarifies:

To be clear, this is not a caching concept, at least not in the current use of the word. Cache would imply that the data on the SSD is duplicated, and it's not. If you have a 1TB mechanical drive paired with the 128GB SSD, you have a 1.12 TB storage platform. This truly is the fusion of all the space on two separate disks.

Ars Technica compares it to an enterprise feature called Automated Tiered Storage.

In a caching solution, like Intel's, files live on the hard disk drive and are temporarily mirrored to the SSD cache as needed. In an enterprise auto-tiering situation, and with Fusion Drive, the data is actually moved from one tier to another, rather than only being temporarily cached there.

The Mac Observer reports that there are two separate drives that appear as one logical partition. As a result, if your Hard Drive fails, it could be replaced with a 3rd party drive and reconfigured as a Fusion Drive.

Meanwhile, they note that all writes take place on the SSD drive, and are later moved to the mechanical drive if needed, resulting in faster initial writes. The Fusion will be available for the new iMac and new Mac mini models announced today.

Related Roundups: iMac, Mac mini
Related Forums: iMac, Mac mini

Popular Stories

Aston Martin CarPlay Ultra Screen

Apple's CarPlay Ultra to Expand to These Vehicle Brands Later This Year

Sunday February 1, 2026 10:08 am PST by
Last year, Apple launched CarPlay Ultra, the long-awaited next-generation version of its CarPlay software system for vehicles. Nearly nine months later, CarPlay Ultra is still limited to Aston Martin's latest luxury vehicles, but that should change fairly soon. In May 2025, Apple said many other vehicle brands planned to offer CarPlay Ultra, including Hyundai, Kia, and Genesis. In his Powe...
Apple Logo Black

Apple's Next Launch is 'Imminent'

Sunday February 1, 2026 12:31 pm PST by
The calendar has turned to February, and a new report indicates that Apple's next product launch is "imminent," in the form of new MacBook Pro models. "All signs point to an imminent launch of next-generation MacBook Pros that retain the current form factor but deliver faster chips," Bloomberg's Mark Gurman said on Sunday. "I'm told the new models — code-named J714 and J716 — are slated...
iOS 26

iOS 26.3 and iOS 26.4 Will Add These New Features to Your iPhone

Tuesday February 3, 2026 7:47 am PST by
We are still waiting for the iOS 26.3 Release Candidate to come out, so the first iOS 26.4 beta is likely still at least a week or two away. Following beta testing, iOS 26.4 will likely be released to the general public in March or April. Below, we have recapped known or rumored iOS 26.3 and iOS 26.4 features so far. iOS 26.3 iPhone to Android Transfer Tool iOS 26.3 makes it easier...
Apple MacBook Pro M4 hero

New MacBook Pros Reportedly Launching Alongside macOS 26.3

Sunday February 1, 2026 5:42 am PST by
Apple is planning to launch new MacBook Pro models with M5 Pro and M5 Max chips alongside macOS 26.3, according to Bloomberg's Mark Gurman. "Apple's faster MacBook Pros are planned for the macOS 26.3 release cycle," wrote Gurman, in his Power On newsletter today. "I'm told the new models — code-named J714 and J716 — are slated for the macOS 26.3 software cycle, which runs from...
iOS 26 Home Feature

Apple Gives Final Warning to Home App Users

Tuesday February 3, 2026 8:55 am PST by
In 2022, Apple introduced a new Apple Home architecture that is "more reliable and efficient," and the deadline to upgrade and avoid issues is fast approaching. In an email this week, Apple gave customers a final reminder to upgrade their Home app by February 10, 2026. Apple says users who do not upgrade may experience issues with accessories and automations, or lose access to their smart...

Top Rated Comments

Stetrain Avatar
173 months ago
This is actually not needed if apple went with 256GB as standard :rolleyes:

How would having a 256GB SSD replacing having a 1TB or 3TB hard drive?
Score: 36 Votes (Like | Disagree)
JesterJJZ Avatar
173 months ago
Personally, an SSD boot drive and separate large HD seems more practical. No need to "fuse" them into one volume. Just seems like asking for trouble.
Score: 32 Votes (Like | Disagree)
gregwyattjr Avatar
173 months ago
This feature is perfect during this HD to SDD transitional period. It'll keep things affordable while still supplying great performance.
Score: 30 Votes (Like | Disagree)
arn Avatar
173 months ago
and most likely that's exactly what it is. It has been available on PCs for a while.
read the article again. seems different

arn
Score: 21 Votes (Like | Disagree)
Stetrain Avatar
173 months ago
Personally, an SSD boot drive and separate large HD seems more practical. No need to "fuse" them into one volume. Just seems like asking for trouble.

The fusion drive is just software to automatically handle that. Most consumers probably don't want to have to deal with having a boot drive and a data drive. Some things can be tricky to get onto an external drive, like iTunes and iPhoto libraries.
Score: 19 Votes (Like | Disagree)
makingdots Avatar
173 months ago
Very interesting, though I'm wondering what if one of those drives fail. Is your data retrievable from the other one?
Doesn't matter. We have Time Machine. :D
Score: 14 Votes (Like | Disagree)