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.
HDD in raid 0 vs SSD. RAID 0 can improve the transfer rate of hard drives to the point where it's similar to SSDs, but it's not the transfer rate that makes SSDs so fast, it's the access time. SSDs have an access time that's about 100 times faster than a hard drive, and RAID 0 (or any other RAID organization) does not improve the access time. RAID 0 with hard drives can help if what you want is to shorten the time it takes to copy or read large files.