[ubuntu] KWorker (?) keeps spinning up HDs

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http://ubuntuforums.org – I've just set up Ubuntu Server 12 wtith LAMP, installed Webmin and Samba and every 5 minutes something seems to call a smartctl command so two of the four HDs spin up. I tried stopping all services and cronjobs, but it still happens. According to blktrace the call comes from kworker - but I guess that could be anything then? Code:   8,16  1        1    0.000000000  3903  G  N [kworker/1:0]   8,16  1        2    0.000001316  3903  I  N 0 (00 ..) [kworker/1:0]   8,16&n (Hardware)