wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.527 GiB/sec and 400312.7443 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0026 sec (1.492 GiB/sec and 390988.9271 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.523 GiB/sec and 399375.9750 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0026 sec (1.497 GiB/sec and 392487.5431 ops/sec)
umount: /dev/sdb: not mounted.