Random command lines to create test files.
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dd if=/dev/urandom of=sample.txt bs=64M count=160 # 10GB
dd if=/dev/urandom of=sample.txt bs=64M count=800 # 50GB
dd if=/dev/zero of=sample.txt bs=1G count=200 # 200GB
dd if=/dev/urandom of=sample.txt bs=1G count=200 # 200GB
source: https://superuser.com/questions/470949/how-do-i-create-a-1gb-random-file-in-linux