wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0033 sec (1.155 GiB/sec and 302689.9202 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0031 sec (1.254 GiB/sec and 328731.9422 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0028 sec (1.351 GiB/sec and 354080.2213 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.288 GiB/sec and 337730.8707 ops/sec)
umount: /dev/sdb: not mounted.