Silicon Power Armor A66 2TB & 5TB Portable Drives - Specs and Tests

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Silicon Power Armor A66 2TB & 5TB Portable Drives
Specs and Tests


Now for a bit of boring details before we jump into testing. While specifications aren't all that exciting, we don't test and expect more than a company promises, so we use these as a baseline for our expectations. You can find all the details over at the Silicon Power product page.

  • Capacity: 1TB, 2TB, 4TB, 5TB
  • Dimensions: 139.2mm x 96.0mm x 16.2mm (1TB/2TB), 139.2mm x 96.0mm x 24.0mm (4TB/5TB)
  • Weight: 209g (1TB/2TB), 328g (4TB/5TB)
  • Material: Rubber + Plastic
  • Interface: USB 3.2 Gen 1 (USB 3.0, USB 2.0 backwards-compatible)



  • Super-speed data transfer with USB 3.2 Gen 1 interface (up to 5Gbps)
  • Massive storage capacities available in two different sizes to cater to various needs (1TB/2TB and 4TB/5TB)
  • Military-grade shockproof drive (meets the MIL-STD 810G Method 516.6 Procedure IV drop test)*
  • Product meets the test standards under normal use. Do not deliberately drop or damage the product.
  • Advanced internal anti-collision suspension system structure effectively reduces impact force and strengthens overall shock-absorption
  • IPX4 water-resistance protects the drive against splashing water from any direction
  • All-around rubber bumper provides 360˚ protection for the drive to take it anywhere, worry-free
  • Smart wrap-around cable design prevents cable misplacement
  • LED light indicates data transfer activity and power status
  • Convenient plug-and-play eliminates the need for external power
  • Free SP Widget software available for download, which provides 7 major back-up and security functions



What it really comes down to is how fast can you backup your files and read them. It's important to have the drive be reliable and durable, but if it reads and writes like an old "floppy" disk, it's pretty useless. We've summed up the results in a couple of tests below.

2TB HD-Tach
2TB HD-Tach

5TB HD-Tach
5TB HD-Tach

HD Tach shows pretty impressive numbers with the 2TB drive averaging a read at 179MB/sec with a burst of 206.6MB/sec. Due to the different platter configuration in the 5TB drive, it is slightly different at 169.1MB/sec average with a burst of 222.3MB/sec. Those are impressive numbers, but don't represent the real-world usage like CrystalDiskMark.

CrystalDisk 2TB
2TB Performance

5TB Crystal
5TB Performance


CrystalDiskMark shows the 2TB drive outperforming when it comes to reading larger file sizes. As is the case with mechanical drives, small random reads and writes take a beating and weigh in rather weak when it comes to reading. Writing these small random 4K files, the 5TB drive performs significantly better than it's 2TB sibling. 

The drive performance is right on par with a 2.5" drive and nothing really stands out - either good or bad. Performance is what we expect from a USB 3.2 Gen 1 mechanical device.


Final Thoughts:

Silicon Power has been around for quite a few years and they know how to make a solid product. We've met them several times at CES and they always impress with the quality, durability and price point. When it comes to storage solutions, they have a bunch of fantastic mainstream SKUs and the Armor A66 2TB and 5TB drives are right in the middle of their sweet-spot. They have some top-tier performing products as well, but their bread and butter seems to be right in the middle of the mainstream market. Here is where they shine as they have some features that set them apart and do so at a price that puts them in the shopping carts of many people.

The cable storage, rubber housing, IPX4 water resistance and the ability to survive trips to and from the office, service calls and daily life make the A66 a great option if you need more storage than you can fit on a flash drive. For many people, the 2TB option will be a perfect fit as it is super affordable at under $70 USD currently. If you're doing backups from several system and need a bit more space, the 5TB - while a bit more bulky - offers over twice the storage capacity at less than twice the price. Cost per GB favors the 5TB drive, but the extra girth of this girl may not be everyone's cup of tea.

Both are very good products, but personally my favorite is the 5TB unit as I'd rather have more space than I need than not enough. It's not often I hear myself say, "Man, I wish I could store less files, movies and music on this drive."

At the end of the day, you can't go wrong with either of these drives as they check all the boxes and do so at a price that makes it easy to swallow.


I'd like to thank Silicon Power for sending these drives for us to review. They are a terrific addition to your laptop bag, backpack, or desk.