wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.324 GiB/sec and 347001.0166 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.288 GiB/sec and 337619.5186 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.307 GiB/sec and 342704.1499 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.266 GiB/sec and 331928.6872 ops/sec)
umount: /dev/sdb: not mounted.