Keep: USB 3 Micro-B
You may have seen a few devices with the odd looking USB 3 Micro-B connection, but it’s certainly not very common. It’s primarily used in newer external hard drives, but the Samsung Galaxy Note 3 also shipped with it.
Keep. This cable is a mixture of old and new technologies. The USB 2.0 portion looks like the familiar Micro-USB connection. Flanking it is the USB 3.0 or 3.1 portion, which provides up to 10 times the throughput of the old standard.
However, with USB Type-C rolling out ahead of schedule, the reversibility and slimmer profile may send the USB 3 Micro-B cable to end-of-life (EOL) status a little sooner than expected. Some devices may still come out with the connection in the future, so hang on to one or two of these as a just-in-case cable.