The fastest read/write speeds will be bottlenecked when transferring data over a connection that uses an older standard like USB 2.0. Make sure your external hard drive uses at least USB 3.0 ...

Using the USB-C cable that charges your Android phone probably won't be as fast as the one that came with your new external hard drive. To make things more confusing, some USB-C cables can be used ...

The Seagate Expansion Portable 2TB external hard drive is USB-powered and weighs 181 grams. It offers a data transfer rate of 5120 Megabytes per second and works with both Windows and Mac devices.