Category C (Class 2) LGV / HGV training runs around Ipswich, Suffolk and uses the DVSA Test Centre in Ipswich. C is the category that allows you to drive a rigid vehicle over 3,500kg.
USB 2.0 is much faster than the DVD data rate. DVD 1x (slowest) write speed is 1.39MB/s. DVD 24x (fastest) write speed is 33.24MB/s. USB 2.0 write speed is up to 35MB/s. A 24x DVD max is about 32MB/s while USB2 max is about 60MB/s.
Win10, 8GB RAM. When I copy 1GB file from HDD to USB, the speed is 8MB/s. The same file from HDD to SSD, the speed is 20MB/s. The same file from SSD to USB, the speed is 40MB/s. (measured through Windows Explorer's copy window, average results with no particular peaks, repeatable without deviations).