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$ sync; time dd if=/dev/zero of=~/test.tmp bs=500K count=1024; time sync 1024+0 records in 1024+0 records out 524288000 bytes (524 MB) copied, 43.7483 s, 12.0 MB/s real 0m43.794s user 0m0.070s sys 0m13.870s real 0m2.676s user 0m0.010s sys 0m0.050s