Skilled’s Score
Professionals
- Straightforward to populate and use
- As much as 32TB (8TB SSDs) of exterior storage
- Good efficiency in single (20GBps) or RAID 0 (40Gbps)
Cons
- Paltry paper documentation
- RAID solely through software program
Our Verdict
If you wish to add gobs of quick storage to your Mac, there’s hardly a greater method than TerraMaster’s four-slot USB4 D4 SSD. You present the NVMe SSDs, however you get almost 4GBps transfers from them in RAID 0 and 1.8GBps individually.
Worth When Reviewed
This worth will present the geolocated pricing textual content for product undefined
Finest Pricing Immediately
Worth When Reviewed
$300
Finest Costs Immediately: TerraMaster D4 SSD
$299.99
With Apple’s reasonably dear after which some inside storage upgrades, you may get much more bang (capability) in your buck with exterior options. Not that the 4-drive TerraMaster D4 SSD is reasonable at $300 sans drives, however even after you add SSDs, it’s loads inexpensive per GB than what Apple fees you. Rather a lot. It’s additionally a properly designed unit with good efficiency.
What are the TerraMaster D4 SSD’s options?
The TerraMaster D4 SSD is a 4-slot (M.2/NVMe) exterior enclosure using the 40Gbps USB4 protocol. That’s mainly Thunderbolt 4 however with higher compatibility than USB3.2×2. You’ll be able to see the inside within the picture under.
The D4 SSD measures 5.5 inches deep and tall, by about 2.35 inches extensive. Comparatively talking, it’s a featherweight for a desktop drive, weighing in at roughly 14.5 ounces, together with SSDs. I’d go away it on its facet if it’s to be positioned in any location the place people would possibly inadvertently knock it about.

Word the extra screw holes within the picture above. They’re there so you’ll be able to match shorter NVMe SSDs if you need.
I used to be not in love with the documentation that shipped with the D4, primarily as a result of all they present you is an image of screwing a 2280 NVMe drive into one thing that may or won’t be the D4. Then there are scan codes for apps, and so forth.

I want to not use my cellphone in any method form or type to arrange or entry storage gadgets. And I didn’t. Establishing the D4 SSD isn’t rocket science. Eradicating a single thumb screw permits entry to the inside and from there it’s merely the same old M.2 set up process.
TerraMaster completely didn’t need the D4 overheating as you’ll be able to inform from the 2 giant followers on the underside of the unit.

My solely qualms in regards to the D4 SSD are that it’s a bit simple to knock over in its desired vertical orientation. In any other case, good job Terrmaster.
How a lot is the TerraMaster D4 SSD?
I already gave away the $300 unpopulated price ticket, however factoring in present discount NVMe SSD costs the D4 SSD with 4TB might be round $600, with 8TB round $800 – $850, with 16TB round $1300, and with 32TB roughly $2900.
Okay, that appears a bit dear once I checked final, an inside 8TB SSD in a Max 4 Studio was $2400. Ahem.
How briskly is the TerraMaster D4 SSD?
The pace of the D4 SSD varies with how you utilize the SSDs inside. Should you use them as particular person storage gadgets, you’ll get roughly 1.6 – 1.7GBps . Should you use macOS’s RAID and mix them in a RAID 0 array, you’ll get effectively upwards of 3GB per second.
Word that whereas I’ve by no means been a fan of working exhausting drives in pure RAID 0, I don’t have the identical trepidation with way more dependable SSDs.
I examined the D4 SSD on a M4 Mac Studio each utilizing macOS’s software program RAID in striped mode 0 and individually. The outcomes have been strikingly related on PCWorld’s take a look at mattress, although I haven’t listed these outcomes due to that very redundancy.
As typical, Disk Pace Check was way more conservative on its estimation of write pace than AmorphousDiskMark and ATTO. 2.2GBps writing, and three.3GBps studying.

AmorphousDiskMark measured the D4 SSD in RAID 0 at 3.85GBps studying and almost 3.1GBps writing.

ATTO had learn speeds maxing out at round 3.75GBps and write speeds are 2.9GBps.

All of the artificial benchmarks agreed on round 1.5-1.6GBps studying and writing when the SSDs contained in the D4 SSD are used individually.

This time AmorphousDiskMark agrees with Disk Pace Check.

And so does ATTO. Round 1.5GBps with giant information.

All in all we have been very happy with the D4 SSD’s efficiency.
Do you have to purchase the TerraMaster D4 SSD?
Although I’d prefer it to be a bit extra reasonably priced, the D4 SSD remains to be a good way so as to add a ton of quick NVMe storage to your system. I’m sanguine about SSD longevity, so I gained’t even say run it in mirrored mode for safekeeping. That apart, at all times again up your important knowledge.