Is there a way to create a file to big withouth actually writing anything in python (just give me the garbage that is already on the disk)?No. That would be a monstrous security hole.
Sure...just install 26 hard-drives and partition each up into 40 1-GB unformatted partitions each, and then read directly from /dev/hd[a-z][0-39]
<gdr> -tkc(ponders to self, "does logical partitioning allow for that many partitions on a disk?")
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