wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.604 GiB/sec and 420533.8809 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.602 GiB/sec and 419844.1984 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.690 GiB/sec and 442906.5744 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.561 GiB/sec and 409109.0691 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.571 GiB/sec and 411906.6774 ops/sec)
umount: /dev/sdb: not mounted.