USB file copy very fast and not completed

Hello
when I try copy big files ( about 700 MB for example ) to USB device my copy speed is very fast ( about 55 MB/S ) and Copy the file is not completed. Any one can help me to solve this problem?

Linux usually doesn't copy the files all at once. You can force it to flush all
remaining data by unmounting the USB device, which will take quite a long time
if you do it immediately after issuing the copy command.
I think there is a mounting option that forces all data transfer to be done
synchronously, in case you prefer that.

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