A January 2013 press release from the USB group revealed plans to update USB 3.0 to 10 Gbit/s (1250 MB/s). The group ended up creating a new USB specification, USB 3.1, which was released on 31 July 2013, replacing the USB 3.0 standard. The USB 3.1 specification takes over the existing USB 3.0's SuperSpeed USB transfer rate, also referred to as USB 3.1 Gen 1, and introduces a faster transfer rate called SuperSpeed USB 10 Gbps, also referred to as USB 3.1 Gen 2, putting it on par with a single first-generation Thunderbolt channel. The new mode's logo features a caption stylized as SUPERSPEED+. The USB 3.1 Gen 2 standard increases the maximum data signaling rate to 10 Gbit/s (1250 MB/s), double that of SuperSpeed USB, and reduces line encoding overhead to just 3% by changing the encoding scheme to 128b/132b.The first USB 3.1 Gen 2 implementation demonstrated real-world transfer speeds of 7.2 Gbit/s.
The USB 3.1 standard is backward compatible with USB 3.0 and USB 2.0. It defines the following transfer modes:
USB 3.1 Gen 1 - SuperSpeed, 5 Gbit/s (625 MB/s) data signaling rate over 1 lane using 8b/10b encoding, the same as USB 3.0.
USB 3.1 Gen 2 - SuperSpeed+, new 10 Gbit/s (1250 MB/s) data rate over 1 lane using 128b/132b encoding.