Use "dd" to create different size files 1B,1K,10K,100K,1M,10M,100M,1G etc
#!/bin/bash-xddif=/dev/urandomof=1Bbs=1count=1ddif=/dev/urandomof=1Kbs=1Kcount=1ddif=/dev/urandomof=10Kbs=10Kcount=1ddif=/dev/urandomof=100Kbs=100Kcount=1ddif=/dev/urandomof=1Mbs=1Mcount=1ddif=/dev/ur