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.
USB flash drives have become an easier way to store and transfer data than burning CDs and DVDs. USB flash drives are nearly infinitely re-writable, whereas most DVDs can only be written to a few times. The flash drives are also easier to carry around, without worry of scratching. In order to transfer the contents of the DVD to a USB flash drive, you can simply copy and paste between the two.