Comment 11 for bug 607560

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Per Wahlström (per-wahlstrom) wrote :

Seems to be the ext4 journaling doing its thing. You can increase the interval (in seconds) by adding for example

  commit=60

to mount-options in /etc/fstab, or disable it altogether with

  tune2fs -O ^has_journal /dev/sda5
  e2fsck -f /dev/sda5

(or whatever your disk is called). Your disk will be more vulnerable for data corruption on uncontrolled shut-downs without journaling.