wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.530 GiB/sec and 401096.7489 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.514 GiB/sec and 396899.2248 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0026 sec (1.498 GiB/sec and 392788.6460 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.553 GiB/sec and 407157.0577 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.541 GiB/sec and 403944.7732 ops/sec)
umount: /dev/sdb: not mounted.