Comment 10 for bug 483569

Same here on a fresh install of 9.10 AMD64 using ext4. Enabling block operation debugging with
  echo 1 > /proc/sys/vm/block_dump
There are lots of writes to blocks by kjournald2 and pdflush every few second in dmesg (and thus /var/log/kern.log). This is only intermixed seldomly by evolution, firefox and rsyslogd dirtying inodes (not blocks).

I'm a bit concerned on the life expectancy of my hard disk and data. :-(