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.
Though USB 3.0 is the fastes in terms of transferring files, eSATA is the next best thing, but tends to be expensive. FireWire is the third fastest, so ideally you want to find a drive that can handle USB 3.0 â assuming your computer has a USB 3.0 port. Not all external hard drives work with all computers. An older model could have a USB 1.1 or USB 2.0 connection instead of a USB 3.0, so pick a drive with the connection you need.