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umount without sync

Hi,

I saw that it is a common practice to issue sync several times before 
umount. I know it's a good practice, but is it really necessary? 

If I copy a big chuck of file to my USB, then issue umount immediately, 
will I lost any data? I think Linux will make sure all data are flushed 
to USB before the umount is successfully finished, but I want a confirm.

How about umount swaps? umount really necessary? 

Thanks

-- 
Tong (remove underscore(s) to reply)
  http://xpt.sourceforge.net/techdocs/
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