http://www.wolframalpha.com/input/?i=1+terabyte+%2F+50+kilobytes http://www.wolframalpha.com/input/?i=1+terabyte+%2F+50+kilob... http://www.wolframalpha.com/in

http://www.wolframalpha.com/input/?i=1+terabyte+%2F+50+kilobytes http://www.wolframalpha.com/input/?i=1+terabyte+%2F+50+kilob... http://www.wolframalpha.com/input/?i=1+terabyte+%2F+250+kilobytes http://www.wolframalpha.com/input/?i=1+terabyte+%2F+250+kilo... So, between 4x10^6 and 2x10^7.