root@pubuntu /mnt/C [34]# time dd if=/dev/zero of=10M count=10 bs=1M
10+0 records in
10+0 records out
10485760 bytes (10 MB) copied, 6.13009 s, 1.7 MB/s

real    0m6.180s
user    0m0.090s
sys    0m6.050s
root@pubuntu /mnt/C [35]# cd
root@pubuntu /home/pubuntu [36]# time dd if=/dev/zero of=10M count=10 bs=1M
10+0 records in
10+0 records out
10485760 bytes (10 MB) copied, 0.160002 s, 65.5 MB/s

real    0m0.230s
user    0m0.020s
sys    0m0.190s
root@pubuntu /home/pubuntu [37]#