Apple's Fusion Drive: Faster Performance in a Simple Consumer-Focused Package

Over the past couple of weeks, we've taken a few looks at Apple's new Fusion Drive used in the latest Mac mini and the upcoming iMac. The Fusion Drive system uses software to seamlessly integrate a 128 GB solid-state drive (SSD) with a 1 TB or 3 TB traditional hard drive to offer users the best of both worlds when it comes to speed and capacity. System files and other frequently used data are automatically moved to the SSD for maximum speed, with lower-priority data being stored on the much larger traditional hard drive.

Macworld has now conducted some benchmarks on the various Late 2012 Mac mini models, including one equipped with Fusion Drive, demonstrating how much faster the system runs with the benefit of the SSD.

[I]t was the Fusion Drive that really kicked the BTO Mac mini into overdrive. The standard configuration $799 Mac mini with its 5400-rpm hard drive took more than three times as long to complete our copy file and uncompress file tests as the Fusion Drive did in the BTO Mac mini. The BTO Mac mini’s PCMark productivity test score (using VMWare Fusion) was three times higher than the high-end standard configuration’s score. [...]

The BTO Mac mini was actually faster than the Retina MacBook Pro in a few tests, like the iPhoto, iMovie, and Aperture import tests. But file copy and file uncompress tests were a bit faster on the Retina MacBook Pro with its “pure” flash storage than on the Mac mini’s Fusion Drive.

mac mini fusion speedmark
A new video posted by TechfastLunch&Dinner also shows how keeping the system files on the fast SSD cuts boot times in half for the Fusion Drive-equipped Mac mini compared to a similar system using only a traditional hard drive.


Ars Technica has also posted a thorough examination of how the Fusion Drive works at a detailed level. The report notes that Fusion Drive is a solid consumer-focused tiering solution with some distinct differences from other caching and tiering implementations.

There are no options to configure, no pinning settings to adjust, and no user-visible method to decide what goes where. The FD volume is a single volume, and its Core Storage underpinnings direct all IO to the SSD first. New files are saved transparently to the SSD side of the Fusion Drive, as are new applications you install. Everything goes to the SSD first.

The logic behind this is clear: Fusion Drive is not meant to be a feature that appeals to the propeller-head geek. The kind of person who already has an SSD and a spinny disk in his Mac... and who symlinks his iTunes and iPhoto libraries off the HDD onto the SDD... and who enjoys meticulously balancing out which files go where will almost certainly not enjoy Fusion Drive's hands-off approach. Fusion Drive is not designed to be poked at or prodded. Rather, much in the same way that Time Machine's hands-off approach brought backup to people who otherwise wouldn't be bothering, Fusion Drive's hands-off approach brings tiering to Mac masses who otherwise can't be bothered. The presentation is very Apple-like, with no knobs to twiddle.

Ars Technica goes on to force chunks of data and whole files to be promoted up to the SSD, examines Boot Camp functionality on the Fusion Drive, and explores what happens should one of the drives fail.

Popular Stories

iOS 18

iOS 18.4 Will Include These New Features for Your iPhone

Wednesday February 5, 2025 7:15 am PST by
iOS 18.3 was released last month, so the first iOS 18.4 beta should be coming soon. iOS 18.4 is expected to be a more substantial update for the iPhone, with several new features and changes related to Apple Intelligence and beyond. Apple's website suggests that iOS 18.4 will be released in April, following beta testing. Below, we outline what to expect from the update so far. Apple...
iCloud General Feature Redux

iPhone Users Who Pay for iCloud Storage Receive an All-New Perk

Thursday February 6, 2025 11:21 am PST by
If you pay for iCloud storage on your iPhone, Apple has a new perk for you, at no additional cost. iCloud+ is the official name for Apple's paid iCloud storage plans, which range from 50GB for $0.99 per month to 12TB for $59.99 per month in the United States. iCloud+ plans already come with multiple perks for free, such as Hide My Email and HomeKit Secure Video, and now there is another one...
iPhone SE 4 Single Camera Thumb

iPhone SE 4 Launching as Soon as Next Week

Thursday February 6, 2025 3:30 pm PST by
Apple's next-generation iPhone SE could debut as soon as next week with a launch to follow later in February, reports Bloomberg's Mark Gurman. Apple isn't expected to hold an event for the iPhone SE 4, and will instead unveil the device through a press release. The iPhone SE 4 is expected to have an iPhone 14-style design, with Apple eliminating the thick bezels and Touch ID Home button of...
iOS 18

iOS 18.3.1 Update Coming Soon for iPhones

Thursday February 6, 2025 7:31 am PST by
Apple is internally testing iOS 18.3.1 for iPhones, according to our website's analytics logs, which have been a consistently reliable indicator of upcoming iOS versions. The software update should be released within the next few weeks. iOS 18.3.1 should be a minor update that addresses software bugs and/or security vulnerabilities. Apple Intelligence notification summaries for news and...
maxresdefault

An Apple TV Refresh is Coming in 2025 - Here's What You Should Know

Wednesday February 5, 2025 10:17 am PST by
Apple hasn't refreshed the Apple TV since 2022, but rumors suggest that we're finally going to get an update in 2025. We don't have a full picture of what to expect yet, but we have some hints on what's coming. Subscribe to the MacRumors YouTube channel for more videos. Updated A-Series Chip The current Apple TV 4K uses the A15 Bionic chip that was in the iPhone 13 lineup, and it's time for...
iCloud General Feature Redux

Apple Ordered by UK to Create Global iCloud Encryption Backdoor

Friday February 7, 2025 2:37 am PST by
The British government has secretly demanded that Apple give it blanket access to all encrypted user content uploaded to the cloud, reports The Washington Post. The undisclosed order is said to have been issued last month, and requires that Apple creates a back door that allows UK security officials unencumbered access to encrypted user data worldwide – an unprecedented demand not before...
Apple Leak Feature

Apple Leaker Issues Apology: 'Profound and Expensive Mistake'

Friday February 7, 2025 9:21 am PST by
Last year, we reported that Apple sued its former software engineer Andrew Aude for providing journalists with confidential information about the company's future plans, including details about the Journal app, Vision Pro headset, and more. As reported by 9to5Mac, the Superior Court of Santa Clara County on Thursday dismissed the lawsuit after Apple and Aude reached an agreement to resolve...
apple wallet drivers license feature iPhone 15 pro

iPhone Driver's Licenses to Expand to These 7 U.S. States

Wednesday February 5, 2025 6:27 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps. Below, we outline which U.S. states and territories offer the feature, and additional states that have committed to rolling it out in...

Top Rated Comments

Mr-Stabby Avatar
160 months ago
While the Fusion Drive is certainly a fast option, i think everybody is forgetting that the iMac and the Mac Mini do not come with this option by default. It is a £200 upgrade. And what's more, the drive that it DOES come with (even the high spec iMacs come with this drive by default) is a pathetically slow (as we can see in the video on this article) 5400rpm drive. Apple should have put a 128gb SSD in the iMacs at least by default, but instead they've actually put in a drive that's a lot slower than the model it replaced. I'm not paying £200 extra on top of the already overpriced iMac to get a drive that performs the way a 2012 iMac should do. Sorry rant over.
Score: 47 Votes (Like | Disagree)
PeterQVenkman Avatar
160 months ago
This means that, like Time Machine, when it works it is invisible and beautiful. When there is an issue, there will be jack one can do about it.

I may get it on a mini.

Edit: dangit, only on the core i7 model, which pushes it above $1000.

I'll put it in an SSD myself.
Score: 13 Votes (Like | Disagree)
nuckinfutz Avatar
160 months ago
I've had a Seagate drive I installed in my mbp for the past several months that does the exact same thing. Is this actually something new, or just another example of apple taking an existing tech, putting a clever name on it and making it seem revolutionary?
No. The Momentus does Caching but it has much less SSD storage. You don't gain any storage you just cache some data to the SSD.

This is data tiering where a 1TB drive and 128GB SSD = 1.128GB of data prior to formatting and seen as 1 volume.

Performance should be better than simply caching.
Score: 12 Votes (Like | Disagree)
profets Avatar
160 months ago
Yes. SSDs are awesome.
Score: 11 Votes (Like | Disagree)
balamw Avatar
160 months ago
I've had a Seagate drive I installed in my mbp for the past several months that does the exact same thing. Is this actually something new, or just another example of apple taking an existing tech, putting a clever name on it and making it seem revolutionary?
From the article:

Commenters in the other articles—particularly those who only skimmed the texts—have wondered at length why we're spending so much (virtual) ink covering Fusion Drive. Isn't it just a plain caching solution? Isn't it the same as Intel SRT? Hasn't Linux been doing this since 1937?

No, no, and no. Intel's Smart Response Technology is a feature available on its newer Ivy Bridge chipsets, and it allows the use of a SSD (up to 64GB in size) as a write-back or write-through cache for the computer's hard drive. One significant difference between FD and a caching technology like Intel SRT is that Fusion Drive alters the canonical location of the data it tiers, moving it (copying it, really, because we don't see a "delete" file system call during Fusion migrations, as we'll demonstrate in a bit) from SSD to HDD. More importantly, with FD, as much data as possible goes to the SSD first, with data spilling off of the SSD onto the HDD. Picture Fusion Drive's SSD like a small drinking glass, and the HDD is a much larger bucket, below the SSD. When you put data onto a Fusion Drive, it's like you're pouring water into the glass; eventually, as the glass fills, water slops over the side and begins to be caught by the bucket. With Fusion Drive, you always pour into the glass and it spills into the bucket as needed.

On the other hand, caching solutions like SRT algorithmically determine what things should be mirrored up from HDD onto SSD. Even though the SSD can be used as a write cache, the default location of data is on the HDD, not the SSD. In caching, the HDD is the storage device with which you interact, and the SSD is used to augment the speed of the HDD. In Fusion Drive, the SSD is the device with which you interact and the HDD is used to augment the capacity of the SSD.

I'm definitely not going all starry-eyed over Fusion Drive, and it's not a revolutionary new thing that will make your computer shoot rainbows out of its USB slots while curing cancer and making sick children well again. However, as we'll see, Fusion Drive is a transparent tiering technology that simply works. It's that seamless always-on functionality that makes it newsworthy—you buy a computer with Fusion Drive enabled and you don't need to install or configure any additional hardware or software in order to enjoy its benefits.
B
Score: 10 Votes (Like | Disagree)
ThisIsNotMe Avatar
160 months ago
While the Fusion Drive is certainly a fast option, i think everybody is forgetting that the iMac and the Mac Mini do not come with this option by default. It is a £200 upgrade. And what's more, the drive that it DOES come with (even the high spec iMacs come with this drive by default) is a pathetically slow (as we can see in the video on this article) 5400rpm drive. Apple should have put a 128gb SSD in the iMacs at least by default, but instead they've actually put in a drive that's a lot slower than the model it replaced. I'm not paying £200 extra on top of the already overpriced iMac to get a drive that performs the way a 2012 iMac should do. Sorry rant over.

Slow for what, browsing the internet, writing the occasional word file, having a medium sized iPhoto/iTunes library?

LOL - You obviously don't understand the iMac or Mac Mini target market.
Score: 9 Votes (Like | Disagree)