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  • I learned this 40 years ago after needing to reinstall the system after power-off corruption. kill + sync, repeat. Commented Aug 14 at 23:08
  • @Mes Isn't it supposed to be sync<return>sync<return>sync? This allows the first sync to finish before you do anything stupid. Commented Sep 2 at 18:37
  • I think modern Linux completes the flush before the sync finishes, so doing it 3x is kinda sily now, not that it wasn't always. Commented Sep 2 at 22:11