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dd

create a large junk file

dd if=/dev/zero of=junkfile.img bs=1 count=0 seek=1G
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9