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Creating large test files

Create a file of 500MB in Windows

fsutil file createnew [filename] [bytes]  
fsutil file createnew output.file.dat 53687091200
Linux

Create a file of 256M in Linux

dd if=[input] of=[output]  bs=[bytes]  count=[blocks]
dd if=/dev/zero of=output.file.dat  bs=256M  count=1