jbd2 and kworker are writing to the disk every few seconds. Although there are a lot of questions related to this topic (as for example 12.04 Excessive hard disk activity), I could not solve it. My disk is running for a couple of months, so it should have finished indexing. I do not see any frequent additions in the log files. The disk seems to be in order according to the disk utility. The hard disk also passed a forced check of partition. fsck of the partition revealed that it is mounted, but e2fsck could not continue.
Do you have any ideas how to solve this?