wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.630 GiB/sec and 427378.9649 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.664 GiB/sec and 436301.6617 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.630 GiB/sec and 427378.9649 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.655 GiB/sec and 433898.3051 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.652 GiB/sec and 433164.1286 ops/sec)
umount: /dev/sdb: not mounted.