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Silicon Power Armor A66 Review: A Solid, yet Borderline Obsolete, Portable Drive

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The Armor A66 is the first portable hard drive I’ve reviewed in a long time — since the WD My Passport in September 2019 — and it might be my last.

With solid-state drives (SSDs) getting more affordable, there are fewer and fewer reasons to get hard-drive-based portable storage.

On top of that, all single-hard-drive-based external storage generally remains the same in terms of performance — they all cap at the speed of SATA 3, 6Gbps.

The Armor A66, as the name suggests, has some extras: It’s a rugged storage device. But as such, it’s also a bit of irony: no matter how rugged its outer housing is, its hard drive on the inside can die from drops or shocks much more easily than an SSD, which has no moving parts.

But at the current cost of less than $70 for 2TB of storage space — there are also larger capacities — the Armor A66 is still a decent rugged portable drive for those who don’t need more than around 100MB/s copy speeds and have a tendency of not handling storage devices with care.

Silicon Power SP Armor A66 Portable Hard Drive
The Silicon Power SP Armor A66 is relatively large for a portable hard drive.

Silicon Power Armor A66: A rugged portable drive of questionable design

The Armor A66 looks cool for a portable hard drive out of the box.

As a storage device based on a single 2.5-inch internal hard drive, it’s a bit large, measuring a tad larger than my palm — and I have big hands. But it’s bulky for a reason.

The drive’s housing comes with different layers of protection to keep the internal hard drive safe from shocks and drops — to a certain extent. It’s also designed to make it watertight.

Silicon Power Armor A66 Rugged Drive
The Armor A66’s housing, according to Silicon Power.

The drive’s top and bottom are black, but its middle enclosure, called the “all-around bumper,” comes in Black, Blue, or Yellow. This part also has a groove that runs along the drive’s three sides to work as a cable holder.

And this is where things get interesting.

Awkward connection design

The Armor A66 includes a USB cable that’s unlike most standard cables you’d find in other portable drives. It’s a USB-A to USB-A cable — the drive’s USB port is the same as a computer’s. In other words, it’s a non-standard cable.

As a result, if you misplace this cable, it will be hard to find a readily available replacement. And for this reason, it would be a much better design if the cable itself were permanently attached to the drive instead of being something you’d need to jank out of the groove and then connect to the port.

On top of that, the drive will not work with a USB-C port without an adapter.

In short, cable-wise, the Armor A66 is awkward — it’s so much worse than the design found in the Armor A75 that came out four years ago. If you’re serious about using it, get a spare cable immediately.

Silicon Power Armor A66: Hardware specifications

Capacity1TB, 2TB, 4TB, 5TB
Models Black body with Black, Blue, or Yellow rim
InterfaceUSB 3.2 Gen 1 (5Gbps)
USB-A female port
Dimensions (LWH)1TB/2TB: 5.48 x 3.78 x .63 in (13.9 x 9.6 x 1.6 cm)
4TB/5TB: 5.48 x 3.78 x .94 in (13.9 x 9.6 x 2.4 cm)
Weight1TB/2TB: .46 lb (209 g)
4TB/5TB: .72 lb (328 g)
Bundled SoftwareSP Widget
RuggednessMilitary-grade MIL-STD 810G shockproof,
IPX4 water resistance protects
CertificationCE, FCC, BSMI, Green dot, WEEE, RoHS, KC, RCM
Warranty3 years
Silicon Power Armor A66’s hardware specifications

Silicon Power Armor A66: Detail photos

Silicon Power SP Armor A66 Portable Hard Drive
The Silicon Power SP Armor A66 Portable Hard Drive’s retail box

Silicon Power SP Armor A66 Portable Hard Drive
The Silicon Power SP Armor A66 comes with a USB-A to USB-A cable out of the box.

Silicon Power SP Armor A66 Portable Hard Drive
The drive has a USB-A female port, just like a host computer. This port has a lid to keep the drive water-resistant.
Silicon Power SP Armor A66 Portable Hard Drive
The Silicon Power SP Armor A66’s underside

Silicon Power SP Armor A66 Portable Hard Drive
The backside of the Silicon Power SP Armor A66’s retail box.

Frill-free drive, terrible software

Out of the box, the Armer A66 is formatted using the NTFS file system, so it’ll work right away with any Windows computer. You can easily reformat it for Mac if need be.

The drive doesn’t come with any features, such as hardware encryption. It does include SP Widget software via download, which you’d wish it didn’t. Seriously, don’t use it!

I first had experience with SB Widget four years ago with the Armor A75 and thought it was terrible then. Well, the Armor A66 uses the same version.

The software is so bad. The interface looks like something out of a high-schooler programming homework and functioned even worse in my testing.

SP Widget Armor A66
The only thing that works well in SP Widget is the part where you change the language, but only to those who don’t speak Russian. Among other things, this software hasn’t been updated since 2015.

In any case, you can always use Windows File History or Mac Time Machine to add more functions to the drive.

Silicon Power Armor A66: Fast hard drive-based performance

The Silicon Power Armor A66 did well in my testing and was fast for a hard-drive-based portable drive.

Via a5Gbps USB 3.2 Gen 1 connection, it averages around 130MB/s in sustained copy speeds, the fastest among its peers, by a small margin.

Silicon Power Armor A66 Performance
Silicon Power Armor A66’s performance

The drive worked with USB 2.0, too, and in this case, averaged around 39MB/s, which was about as fast as this standard can be.

The drive remained cool and quiet even during extended tasks. It just worked.

Regarding ruggedness, I tossed it around a few times on the carpet floor and left it in the kitchen sink for over five minutes (it sank!), and it survived intact.

Silicon Power Armor A66's Rating

7.3 out of 10
Silicon Power SP Armor A66 Portable Hard Drive
Performance
8 out of 10
Features
8 out of 10
Design and Setup
6 out of 10
Value
7 out of 10

Pros

Fast hard-drive-based performance

Rugged and light design

Relatively affordable

Cons

USB-A female port instead of USB-C

Impractical connection design

Terrible SP Widget software

Conclusion

The Silicon Power Armor A66 would have been a terrific portable storage device had it come out five years ago. These days, though, you might question why it doesn’t use a solid-state drive on the inside instead.

Nonetheless, if you’re looking for an affordable, high-capacity portable drive to carry on the go that can handle a bit of rough-housing, the Armor A66 is worth consideration. Alternatively, you can also check out the many SSD alternatives.

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