it is false advertising imho.
CDR's on the other hand that say 650 or 700mb are 654 or 702ish mb (actually)
I once saw an add for some dvdr's that said "over 7 times the capacity of a cdr!!" i sooo wanted to catch them on that /chuckle (6x650 is 4.55gb which is more than 4.38gb)
Unfortunately there are only 10 types of people in the world. Those that understand binary... and those that dont (im sure some people will get this joke)
Those that dont understand binary just cant fathom the base 2 number system and why its 1024 instead of 1000.