wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.570 GiB/sec and 411575.5627 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.579 GiB/sec and 413904.6079 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.569 GiB/sec and 411410.2049 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.616 GiB/sec and 423665.7013 ops/sec)
wrote 4194304/4194304 bytes at offset 0
4 MiB, 1024 ops; 0.0024 sec (1.576 GiB/sec and 413236.4810 ops/sec)
umount: /dev/sdb: not mounted.