wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.275 GiB/sec and 334203.6554 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.282 GiB/sec and 335958.0052 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.331 GiB/sec and 348892.6746 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.302 GiB/sec and 341333.3333 ops/sec)
umount: /dev/sdb: not mounted.