Best USB-C Flash Drives with USB-A Compatibility

 September 2021         Ian Chiu

We tested five 64GB dual flash drives from Kingston, Samsung, and Sandisk.  These USB 3.1 Gen. 1 drives serve as a bridge between USB-C and legacy USB-A PCs, offering you the best of both worlds.

 Our Picks

Out of the five dual-headed drives we tested, the Samsung’s Duo Plus and the Sandisk’s Ultra Dual are our choices.   The Samsung excels in performance whereas the Sandisk is better suited for everyday use with its solid build quality and USB slider.  You’ll notice the write speeds are on the low side.  Having said that, consider these drives to be best for light-duty use.

 Do I need a Dual Flash Drive?

Dual flash drives – having USB Type-A and USB-C connectors on opposite ends – are becoming more relevant as more computers and smartphones ship with the reversible USB port exclusively.  They make sure you have readily access to your data on your future-proof USB-C devices as well as giving you backward compatibility on PCs and Macs with good old USB Type-A.  For this reason, it will never hurt to have at least one of these dual-headed flash drives in case you need a quick and easy file transfer solution.

Feature Comparison

	Kingston DT microDuo 3C	Kingston DT Duo	Samsung Duo Plus	Sandisk Ultra Dual	Sandisk Ultra Dual Go
Storage:	16 - 128GB	32 - 64GB	32 - 256GB	16 - 256GB	32 - 512GB
Interface(s):	USB 3.1 Gen 1 Type-A USB 3.1 Gen 1 Type-C	USB 3.1 Gen 1 Type-A USB 3.1 Gen 1 Type-C	USB 3.1 Gen 1 Type-A USB 3.1 Gen 1 Type-C	USB 3.1 Gen 1 Type-A USB 3.1 Gen 1 Type-C	USB 3.1 Gen 1 Type-A USB 3.1 Gen 1 Type-C
Dimensions:	30 x 16.6 x 8.4mm	64 x 21.2 x 10.4mm	57.9 X 18.3 X 7.3mm	38 x 20.1 x 9.4mm	44.5 x 12.2 x 8.6mm
Weight:	4.5g	20g	7.7g	9.1g	3.7g
Build Material:	Plastic & metal	Plastic	Plastic	Plastic & metal	Plastic
USB Plug Protection?	Rotating cap for USB-C connector	Retractable connectors	Removable caps	Retractable connectors	Rotating cap
Color(s):	Silver	Black	Black & grey	Black & silver	Black
Android File Manager?	No	No	No	Sandisk Memory Zone	Sandisk Memory Zone
Release Date:	July 2015	Oct 2020	August 2018	May 2016	Jan 2020
Warranty:	5 years	5 years	5 years	5 years	5 years

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Benchmark Analysis

We carried out our drive benchmarks on two different platforms – Windows 10 Pro running on MacBook Pro (2018) and Android running on Samsung S8 Plus (2017).  Samsung proudly advertises the read speed of its Duo Plus can hit 300MB/s whereas Kingston claims read speed of 100MB/s for its MicroDuo 3C.  Lastly, both Sandisk Ultra Dual and Ultra Dual Go can deliver speeds up to 150MB/s under ideal conditions.

For our PC benchmark, our testing with the USB-C interface involved transferring a 9GB MP4 file back and forth between our MacBook Pro and the drives.  We then repeated the process with a 5GB folder containing 1000 JPEGs.  Tests were carried out on Nodesoft’s DiskBench.  From the graph above, the Samsung Duo Plus was clearly ahead of the competitors but the advantages greatly diminished during write operations.  There’s also something peculiar to the Kingston DataTraveler Duo as the drive consistently fell short of expectations by today’s standards.

Next, we looked into the kind of performance you can expect if you plan on using these dual flash drives for regular photo backups and large video imports on a Galaxy S8.  The Samsung flagship smartphone is equipped with USB-C capable of delivering 5Gbps; though, keep in mind not every Android handset released since 2017 is USB 3.1.  For this set of benchmarks, we repeated the same copying procedures with the same files we used on the MacBook Pro earlier.

From the graph above, the Samsung Duo Plus led by a fair margin across the board, and the Sandisk Ultra Dual is a distant second. It’s, however, important to note that all these drives were on the low end of expectations in terms of write speeds by today’s standards.

For the record, we did try these drives on our 2021 iPad Pro, but it’s a lost cause.  While copying from the flash drives to the iPad was completed in a timely manner, going the other way around was pitifully slow to the extent that we had to unplug the drives prematurely before the transfers were even finished.

Drive Design & Software

For heavy use, the Kingston, Sandisk, and Samsung with their all-plastic body are better as we didn’t have to wait for the drives to cool down before pulling them out from a USB port whereas, in the case of Sony, we had to wait half a minute or so because these bare drives might get too hot to handle after several minutes of intense I/O operations.

Design-wise, size, and build quality definitely come into consideration.  Kingston, Samsung, and Sandisk are more compact and durable in that respect.  It’s worth noting the Samsung’s Duo Plus is technically USB-C only as it is bundled with a USB-A adapter that can be pulled out from the opposite end.  There’s also a removable cap for the USB-C plug. So you end up with more parts to keep track of during daily use.

Kingston’s DataTraveler microDuo 3C, on the other hand, opts for a swivel cap that only protects the USB-C plug while Sandisk’s Ultra Dual and Kingston’s DataTraveler Duo both pick a retractable connector design, which keeps the drives’ razor-sharp edges from puncturing your jean pockets.

Keep in mind only Kingston’s microDuo 3C and the Sandisk’s Ultra Dual Go are compatible with Android smartphones in a protective case.

On the software side, the Sandisk provides its own Android backup and file management app.  We didn’t have any luck getting our Sandisk Ultra Dual recognized by the company’s Memory Zone app on our Samsung S8+.  Since there’s already an abundance of third-party file browser apps on the Google Play Store, you should have plenty of options when it comes to managing files on your USB drives on an Android smartphone or tablet.

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