On 17/09/10 22:25, T o n g wrote: > 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 > umount has been answered already... With the USB I'd add the obvious - don't use "umount -l" Any unusual mount options you're using? What is the file system? umount swap? I suspect you mean "swapoff" (though I can't think of many uses). man swapon
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