pi64 /home/demouser # sudo dd if=/dev/zero of=/tmp/xteve/zero bs=4k count=100000
dd: error writing '/tmp/xteve/zero': No space left on device
65537+0 records in
65536+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 0.62086 s, 432 MB/s
pi64 /home/demouser # sudo dd if=/tmp/xteve/zero of=/dev/null bs=4k count=100000
65536+0 records in
65536+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 0.257992 s, 1.0 GB/s