Portable external SSD face-off: ADATA SD700 vs. Samsung T3

By Kenny Yeo - 4 Jun 2017

ADATA vs. Samsung

The rise of portable external SSDs

One of the biggest improvements in computing over the past few years is the increased adoption of flash storage. While it is true that CPU and GPU technology have both improved significantly over the past years as well, it is the widespread adoption of flash memory and SSDs that I think has had the biggest impact on computing experiences. Think about how much boot up and loading time SSDs have saved you. Speed aside, SSDs also have a size advantage. Today, it is possible to cram as much as 2TB of storage onto an M.2 drive the size and weight of a stick of chewing gum. That is just incredible.

ADATA's new SD700 takes on Samsung's T3 in this portable external SSD shootout.

Thanks to these two significant advantages, portable external SSDs have also begun to enjoy an increase in popularity. Not only are portable external SSDs a lot quicker than traditional portable mechanical external hard disk drives, they are a lot more portable too. Most portable external SSDs will fit quite easily into pockets, but you cannot say the same for portable external hard disk drives. And because portable external SSDs have no moving parts, they are tougher and more resistant to shock too. As a result, we are beginning to see more portable external SSDs coming into the market. Today, we are going to pit Samsung’s T3 portable external SSD against one of the newest portable external SSDs on the market - ADATA’s new SD700.


The ADATA SD700 features a square design and its metal chassis is protected by a ring of rubber.

The ADATA SD700 features a square metallic case and the chassis is protected by a ring of rubber. It was designed to be one of the first dust and waterproof portable external SSDs. In fact, according to ADATA, the SD700 passes IEC IP68 specifications. This means it is dust tight and can stay submerged in 1.5 meters of water for up to an hour. Additionally, the SD700 also passes the U.S. Army MIL-STD-810G 516.6 shock and drop resistance standard. What this all means is that the SD700 is a super tough portable external SSD.

In terms of size, the ADATA SD700 is quite a bit larger than the Samsung T3, but it still remains very compact. It is still possible to fit the SD700 into the pocket of your pants, but it is going to be a bit more of a squeeze. 

No USB Type-C here or Thunderbolt 3. The ADATA SD700 connects via a USB 3.0 Micro-B port, which is of course backwards compatible with ubiquitous micro-USB 2.0 cable/connection.

The ADATA SD700 doesn’t support the newer USB Type-C connector nor does it support faster USB Type Gen 2 or Thunderbolt 3 speeds. Instead, it supports USB 3.0 and features the same single USB 3.0 Micro-B port that we see on so many other USB 3.0 portable external hard disk drives. A single USB 3.0 to USB 3.0 Micro-B cable is provided for users to connect the SD700 to their systems. The cable is of a fair length, but it is quite thick and therefore makes the SD700 more cumbersome to carry around. An integrated connector would have been a much more elegant solution, but I have yet to see an external portable SSD with such a feature.

Inside, the ADATA SD700 features a Silicon Motion SM2258 controller and uses 3D TLC NAND chips from IMFT. These are pretty standard ingredients for any mainstream SSD. Claimed performance figures according to ADATA are sequential read and write speeds of up to 440MB/s and 430MB/s respectively. That is quite comparable to the Samsung T3, which claims sequential read and write speeds of up to 450MB/s.

The supplied connecting cable is fairly long and is really thick.

Like the Samsung T3, the ADATA SD700 also supports UASP. UASP or (USB Attached SCSI) protocol is a standard aimed at improving USB 3.0 performance by transferring data and commands in separate "pipes" and executing multiple commands in parallel. So if you have a compatible system (most modern systems running Windows 8 and Mac OS X 10.8 and above should support UASP), one can expect better performance. 

Unfortunately, unlike the Samsung T3, the ADATA SD700 does not come with any built-in security features. So while the SD700 is extremely sturdy and rugged, protecting your data from unauthorized access would require users to take measures of their own.


Samsung T3

The Samsung T3 features a mostly metal construction and is really small.

The Samsung T3 was previously reviewed here, so I’m going to be brief in my introduction.

The Samsung T3 comes in a mostly metal chassis (to improve heat dispersion) and is wonderfully small. It is so small that it will slip into pockets easily. However, the same design issue that plagued the original T1 is present in the T3 as well. And that is the supplied USB cable, which is long and cumbersome to carry around. An integrated retractable USB connector would have been a much more elegant solution.

Inside, the T3 uses components found on Samsung’s SSDs. There’s the MGX controller and four NAND packages which are made up of Samsung’s new high-density 48-layer 256Gbit TLC V-NAND

Though the Samsung T3 connects via a USB Type-C port, it only supports USB 3.1 Gen 1 (5Gbps), so don't expect any improvements to performance.

The T3 also comes with a USB Type-C connector and supports the newer USB 3.1 standard, but only up to 5Gbps. This doesn’t really affect performance and or usage (since the bundled cable still terminates in a USB Type A connector), but it’s something users should take note, especially if you forgot to bring the bundled cable along with you.

The Samsung T3 has easy to setup password protection and 256-bit AES encryption to keep your data safe.

The T3 has an emphasis on security and supports 256-bit AES encryption. When you first plug the T3 into your system, the security program will run and prompt you to setup the T3 with a password. Be careful, though, the password cannot be reset on its own, so make sure you remember it. If you happen to forget your password, the only solution is to bring it down to the service center and have it reset by Samsung. This all or nothing approach sounds a little drastic, but it’s actually the most secure.

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