Speeds can also be checked at www.broadbandspeedchecker.co.uk
MB = Megabyte; GB = Gigabyte
Please note that a broadband connection will have a speed in the range of 0.5 to 20 Mbps (megabits per second) and there are 8 bits in a Byte.
These files are made of random data, and although listed as zip files, will appear to be corrupt if you try and open them.