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.
Now that there are many cheap options for USB 3.0 flash drives, there really is no reason to get a USB 2.0 drive. USB 3.0 brings much better file transfer speeds than what USB 2.0 could deliver. For example, the best USB 2.0 flash drives could only transfer files at speeds of 30 to 40MBps. The best USB 3.0 flash drives are closing in on 250MBps. It's important to note that USB 3.0 drives work in USB 2.0 ports; you'll just be limited to USB 2.0 speeds.