wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.609 GiB/sec and 421746.2932 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.630 GiB/sec and 427200.6675 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0023 sec (1.687 GiB/sec and 442141.6235 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.606 GiB/sec and 420879.5725 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.607 GiB/sec and 421225.8330 ops/sec)
umount: /dev/sdb: not mounted.