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 (1.280 GiB/sec and 335517.6933 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.333 GiB/sec and 349488.0546 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.309 GiB/sec and 343163.5389 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0028 sec (1.348 GiB/sec and 353347.1360 ops/sec)
umount: /dev/sdb: not mounted.