I am considering buying the HP 32GB thumb drive ($23) from Newegg Shell Shocker 3-6PM PT today. Am hoping that it may hold the contents of my C: drive which I would hope to use for backup purposes but I do not know if it will. How can I know the size of what is presently stored on my C drive on my windows 7 machine? I feel as though that I should know the answer but I want to be sure, otherwise I have no need for such a thumb drive. The price is very reasonable and you may be in need of this flash drive. As usual, TIA.