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  • Certain HDD controllers have battery backup so in the event of a power failure uncommitted data is preserved on the controller until power is restored. That allows the use in database applications where losing data is not an option. Commented Aug 21, 2015 at 6:37
  • Linux stores data not yet written in RAM, not HDD. HDD does have it's own cache too. Commented Aug 21, 2015 at 8:08
  • It would be quite convenient if any file opened by a process would be sync'ed when the process closes. This would not affect the process itself, but it would simplify shell scripts and the like (which now have to sync a whole filesystem) Commented Aug 21, 2015 at 9:33
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    That's more than an illusion. Asynchronous writes do improve the overall performance of applications. Commented Aug 21, 2015 at 11:33
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    @frostschutz: Beyond files existing only temporarily, there is also the fact that some areas of files get re-written over and over. Commented Aug 22, 2015 at 17:14