gistfile1.txt

sudo dd if=/dev/zero bs=2M | pv -s 200G | sudo dd of=/dev/sdb bs=2M
^C
0+1076858 records in
0+1076858 records out
141145931776 bytes (141 GB) copied, 5594.01 s, 25.2 MB/s

gistfile2.txt

sudo dd if=/dev/zero bs=2M | pv -s 60G | sudo dd of=/dev/sdb bs=2M seek=1076858
dd: `/dev/sdb': cannot seek: Invalid argument
   0B 0:00:00 [   0B/s ] [>                                                                       ]  0%            
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.0166122 s, 0.0 kB/s