wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0028 sec (1.347 GiB/sec and 353225.2501 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.302 GiB/sec and 341333.3333 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.338 GiB/sec and 350684.9315 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.273 GiB/sec and 333767.9270 ops/sec)
umount: /dev/sdb: not mounted.