-
USB 0.7
Released in November 1994.
prerelease -
USB 0.8
Released in December 1994
prerelease -
USB 0.9
Released in April 1995
prerelease -
USB 0.99
Released in August 1995
prerelease -
USB 1.0 Release Candidate
Released in November 1995. -
USB 1.x
specified data rates of 1.5 Mbit/s (Low-Bandwidth) and 12 Mbit/s (Full-Bandwidth) -
USB 2.0
(now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), in addition to the "USB 1.x Full Speed" signaling rate of 12 Mbit/s -
USB 3.0
The standard defines a new SuperSpeed mode with a signaling speed of 5 Gbit/s and a usable data rate of up to 4 Gbit/s (500 MB/s) -
USB 3.1
The USB 3.1 standard increases the signalling rate to 10 Gbit/s, double that of USB 3.0