This seems to be running a LOT on my system.
I think it may be because I defined a RAID-1 partition (md4) by booting into standalone Linux and manually creating it. Then booting LinuxMCE it had problems mounting it (I put a wrong option into /etc/fstab). I am mounting the partition over /home. It is JFS.
Think LinuxMCE deteced the partition at first boot and assigned it a device number (before I ficed the mount problem). Now it is mounted properly as /home.
Could it be because LMCE is updating files in /home, which then trigger a rescan because it is also a disk device?
I am away from home right now so can't give more details.