wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0026 sec (1.453 GiB/sec and 380810.7103 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.510 GiB/sec and 395825.2802 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0026 sec (1.480 GiB/sec and 388025.7673 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0025 sec (1.529 GiB/sec and 400782.7789 ops/sec)
umount: /dev/sdb: not mounted.