fusion drive vs flash storage

Fusion Drive VS Flash Storage 2020

Fusion Drive VS SSD

However, my indecision over one sticking point almost wound up derailing the movie. It’s the reason it took me several months from the announcement of the new iMacs last October to finally make the purchase a few weeks ago.

Fusion Drive VS SSD

Even after the iMac arrived, my uncertainty remained. So much so, that I almost returned the machine. The dilemma? Whether to get a fusion drive or SSD or Flash (SSD) Storage? And, especially if the latter, what size drive?

While I believe there is no single best choice that applies to everyone, after much internal debate, I found the right one for me.


At first, it seemed so simple. I planned to get the 3TB Fusion drive. While I could have gotten by with a 2TB drive, it was worth a $ 100 to have the roominess of an extra TB. I figured I ‘d be buying a new Mac before I outgrew that much space. My wife already had an iMac with SSD  3TB Fusion Drive. So I knew that the drive was adequately fast and very quiet Done deal. Except … my inner geek was not satisfied.

True, a Fusion Drive is fast. But an SSD vs fusion drive is even faster.  In fact, thanks to design improvements in the 2015 iMacs, Apple claims the iMac’s Flash Storage is “up to 2.5 times faster” than the SSD in 2014 iMacs.

Internal Fusion Drive VS SSD

A fusion drive vs hard drive is quiet, but an SSD is not only quieter, but it’s also completely silent.      Plus, SSDs are the future. Within a few years, I expect HDDs (hard disk drives) to be history. Even the Fusion Drive (which is a combination of SSD and HDD) will likely be gone. I wanted to go with the future.

Further, flash storage vs SSD mac, because it has no moving parts, is more reliable than a Fusion Drive. Of special note, the technology that “melds” the SSD and HDD components of a Fusion Drive can fail, even if the separate components are otherwise fine, leaving you with an inaccessible drive. This will require an apple fusion drive review to fix it. While not common, this has happened to a few friends of mine.

The HDD component of a Fusion Drive spins at 5400 RPM. Most internal drives sold today are 7200 RPM. Obviously, I would prefer the faster RPM speed. I also don’t like that, with a Fusion Drive, I have no control over what files are shunted to the SSD portion; it is all determined by Apple’s software. While such matters might not significantly impact the performance of a Fusion Drive, they still irked me.

On the other hand, the biggest problem with pure SSDs is that they are much more expensive than Fusion Drives. The largest capacity Flash Storage you can get preinstalled in an iMac is only 1TBand it costs $700 more than a 2TB Fusion Drive.

The result? Indecision! After mulling things over for a couple of months … and changing my mind numerous times, I finally settled on the Flash Storage.

I was not quite done. I still had to decide which size to get. The 512GB option, at only $100 more than a 3TB Fusion, quickly emerged as my preferred choice. The lesser, 256GB drive, although twice the size of the SSD portion of the Fusion Drive, was too small to hold my essential files (System and Home Libraries, Applications, and Documents). At the other extreme, the 1TB Flash Storage still wasn’t large enough to hold all my files; not worth the extra cost.


With the main dilemma decided, I had one more problem to resolve: What sort of external storage would I use?

The 512GB SSD was 1/6 the size of the 3TB Fusion Drive I had initially planned to get. To accommodate all my data, external storage was now a requirement. Even if I could fit all my data on the internal SSD, I would still need external storage for mirrored backups. In other words, I would need at least 2 external drives.External

Initially, I decided to buy an OWC ThunderBay 4 ($ 400). With this unit, I could transfer the three drives that had previously lived in my Mac Pro, saving the cost of having to purchase new drives. In addition, the ThunderBay provided the fastest possible transfer speeds (Thunderbolt 2) with the greatest capacity for future expansion, all via a single compact box that needed only one connection to the iMac.

This was a fine, albeit still expensive, solution. I would have stuck with this setup except for one thing: noise. Don’t get me wrong. The ThunderBay is quiet overall. Depending on your sensitivity, it may not bother you at all. But it is far from silent.

For starters, the ThunderBay has a constantly running fan. While not a noisy fan, the sound is definitely noticeable, even with the unit placed under my desk. Compared to my wife’s Fusion Drive iMac flash drive,  I could instantly hear the difference.

Second, the 3.5inch HDDs inside the ThunderBay made significant noise during reading and write access. The noise was not annoyingly loud, but, once again, it was much more noticeable than similar sounds from my wife’s iMac fusion drive vs SSD Drive. While all of this was tolerable, I wanted better.  Better than even the Fusion Drive.  I wanted to maintain the near-total silence afforded by my iMac’s Flash Storage. So I looked for another solution.

Eventually, I settled on Seagate portable drives. These USB 3 drives are essentially noiseless. At least I can’t hear them. They are also about as small and unobtrusive as a driver can get. And, as they get their power from the iMac’s USB port, there are no power cords or bulky adapters to worry about.

As a bonus, they are a cheaper alternative to the ThunderBay. The two drives I got (1 2TB and 1 4TB) cost about $200: half the price of an empty ThunderBay. You could save even more money if you could fit all your data on the iMac’s internal Flash Storage (perhaps needing only a 256GB SSD?) and thus could get by with only one external drive.

The one downside is that transfer speeds via USB 3 are distinctly slower than via Thunderbolt 2. If you need maximum speed, the ThunderBay remains the preferred solution.

External Fusion Drive VS SSD

 In my case, as I use the external drives only to hold my media libraries (iTunes and Photos), archival data, and backups, I didn’t think the speed difference would matter at a practical level. Most of the time, the drives would not be in use at all.

[By the way, overall, I prefer to keep my media libraries on a separate drive from my System and other Home directory files; it makes the media files less likely to become collateral damage in the event of a disaster with the startup drive.

I do have some concern regarding the longterm reliability of keeping fanless portable drives connected to a Mac 24/7. However, my past experience doing this with other Seagate portable drives has been excellent, so I am willing to take the risk.

Wrapping up

So here I am typing on my new iMac. With its 512GB Flash Storage, it is both super fast and completely silent. The external portable Seagate drives provide the extra space I need without adding noise or detracting from the iMac’s curb appeal.

If your requirements are at all similar to mine, I highly recommend this solution.

What is fusion drive, and Why Should You Care?

There are two basic types of storage devices available today: hard disk drives and solid-state drives. For the lowest cost per gigabyte, you can’t go wrong with a hard drive, and they come in truly massive sizes– up to a whopping 8 terabytes. However, they’re relatively slow.

For speed, you want a solid-state drive, also known as an SSD. Because SSDs rely on flash storage, a type of non-volatile memory whose chips retain data without power, they’re lightning fast. But chips are more expensive than hard disk platters and read/write heads, so the $250-$300 that will get you an 8 TB hard drive is enough for only a 1 TB SSD.

What is fusion drive , and Why Should You Care?

Apple fusion drive vs SSD came up with a compromise:  the Fusion Drive. As its name suggests,    a Fusion Drive melds a hard disk drive with flash storage to provide the best of both worlds. The user sees just a single volume, but behind the scenes, macOS automatically and dynamically moves frequently used files notably those used by the operating system to the flash storage portion of the fusion drive vs SSD iMac for faster access while keeping infrequently used files on the hard drive.

In essence, the Fusion Drive provides much of the speed of an SSD along with the capacity of a hard drive. What’s not to like?

There are some caveats. Good as a Fusion Drive is, it will never be as fast as a pure SSD, and you’ll probably notice that most when working with older files. Try editing some photos from last year in Photos and you’ll likely be working entirely on the slow hard drive.

Also, Apple provides the Fusion Drive as an option only for the iMac and Mac mini; there’s no room for it in a modern MacBook. But not all Fusion Drives are created equal. They come in 1 TB, 2 TB, and 3 TB sizes, although not all iMac and Mac mini models can accept the larger Fusion Drives.

In essence, the Fusion Drive provides much of the speed of an SSD along with the capacity of a hard drive. What's not to like?

Originally, all Fusion Drives had 128 GB of speedy flash storage alongside the hard drive, but in 2015, Apple reduced the amount of flash storage in the iMac’s 1 TB Fusion Drive to a paltry 24 GB (the Mac mini’s 1 TB Fusion Drive still has 128 GB). The company subsequently increased it to 32 GB, but if you’re buying a new iMac and want better performance from a Fusion Drive, go for either 2 TB or 3 TB, both of which have 128 GB of flash storage.

One final note. As of this writing, macOS 10.13 High Sierra will not convert a Fusion Drive to Apple’s new APFS file system. We anticipate that will change at some point in the next year, and APFS might make Fusion Drives even a bit faster.

All that said, if you want the best performance and can afford the cost, get an SSD. If you need more space than an SSD can provide, consider using the SSD internally and adding an external hard drive connected via USB 3 or Thunderbolt 3.

Barring that, a Fusion Driveparticularly one with 128 GB of flash storage remains a good compromise. Honestly, we can’t currently recommend a hard disk drive as the primary storage for a Mac unless low cost is paramount. Hard drive performance just isn’t good enough.