wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.313 GiB/sec and 344086.0215 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.279 GiB/sec and 335407.7956 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0031 sec (1.225 GiB/sec and 321003.1348 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0031 sec (1.248 GiB/sec and 327261.1058 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0031 sec (1.243 GiB/sec and 325907.0656 ops/sec)
umount: /dev/sdb: not mounted.