I had to stuck in next problem before a week:
The 2TB USB hard drive i own was mounted automatically with async option by default (my suggestion) while causing send data to the device be cached for "faster" transaction.
As the result, longterm transaction of about 16GB of data almost ended with gigabytes data loss due to early disconnection of the drive (visual copy process end, followed by PC shutdown w/o eject).
Checking the Disks GUI shows for automatical parameters use. Switching to manual parameters use and adding "sync" mount parameter instead solved the issue.
Therefore upcoming question: What software is actually responsible for automount on connection (mount, disks, nautilus) in case of GUI use, and how in turn to change/view the default used parameters for the operation?
The assistance is greatly appreciated!