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.

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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

Top Rated Comments

Stetrain Avatar
108 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
108 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
108 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
108 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
108 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
108 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)

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