wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.598 GiB/sec and 418813.9059 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.594 GiB/sec and 417959.1837 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.645 GiB/sec and 431157.8947 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.604 GiB/sec and 420533.8809 ops/sec)
umount: /dev/sdb: not mounted.