wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (2 GiB/sec and 409600.0000 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.581 GiB/sec and 414407.1226 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.564 GiB/sec and 410092.1105 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.542 GiB/sec and 404263.7189 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.596 GiB/sec and 418471.5979 ops/sec)
umount: /dev/sdb: not mounted.