Makes a big file.

mkbigfile.py

#!/usr/bin/env python
# Based on http://stackoverflow.com/questions/982659/quickly-create-large-file-on-a-windows-system
import os
import sys

if len(sys.argv) != 3:
	print 'usage: mkbigfile.py <filename> <size in gb>'
	sys.exit(1)

# Grab the filename and requested size, convert the size to bytes
filename = sys.argv[1]
size = int(sys.argv[2]) * 1024 * 1024 * 1024

# Make sure the file doesn't already exist
if os.path.exists(filename):
	print 'error: file "' + filename + '" already exists'
	sys.exit(-1)

# Make a big file
f = open(filename, 'w')
f.seek(size - 1)
f.write('\x00')
f.close()

# Quick test, make sure we're close to the right size
createdSize = os.stat(filename).st_size
if abs(size - createdSize) > 500:
	print 'Created file seems to be the wrong size. My bad.'
	sys.exit(2)