wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0029 sec (1.314 GiB/sec and 344549.1252 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.277 GiB/sec and 334749.9183 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0031 sec (1.240 GiB/sec and 325182.5977 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0030 sec (1.297 GiB/sec and 339973.4396 ops/sec)
umount: /dev/sdb: not mounted.