*** This bug is a duplicate of bug 379780 ***
https://bugs.launchpad.net/bugs/379780
I am also experiencing this issue.
Per the tail of this forum thread:
http://ubuntuforums.org/showthread.php?p=8110630
I was able to stop the continuous disk access by restarting the udev service.
Here's "top" at first login after a reboot:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3305 root 20 0 5988 3744 2240 S 8 0.2 1:06.80 devkit-disks-da
880 messageb 20 0 3280 1608 748 S 8 0.1 0:56.49 dbus-daemon
3320 schaefer 20 0 6496 3040 2380 S 5 0.1 0:39.04 gvfs-gdu-volume
1 root 20 0 2640 1556 1120 S 4 0.1 0:31.39 init
504 root 18 -2 2372 848 312 S 4 0.0 0:32.33 udevd
3287 schaefer 20 0 27780 11m 8676 S 4 0.6 0:26.37 update-notifier
3283 schaefer 20 0 17344 6576 5152 S 3 0.3 0:20.43 gdu-notificatio
483 root 20 0 2584 1220 944 S 2 0.1 0:11.55 mountall
498 root 20 0 2148 748 568 S 1 0.0 0:09.24 upstart-udev-br
500 root 16 -4 2704 1144 300 S 1 0.1 0:05.92 udevd
1126 root 20 0 92532 20m 9368 S 1 1.0 0:08.95 Xorg
Here it is after "sudo restart udev":
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1126 root 20 0 108m 23m 9.9m S 3 1.2 0:22.10 Xorg
7388 schaefer 20 0 241m 81m 24m S 2 4.1 0:10.36 firefox
7386 schaefer 20 0 2468 1180 884 R 1 0.1 0:00.42 top
3215 schaefer 20 0 83560 26m 7804 S 0 1.3 0:04.30 compiz.real
3217 schaefer 20 0 60676 19m 13m S 0 1.0 0:04.29 gnome-panel
1 root 20 0 2640 1556 1120 S 0 0.1 0:42.54 init
2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:00.08 migration/0
4 root 15 -5 0 0 0 S 0 0.0 0:00.01 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0
6 root RT -5 0 0 0 S 0 0.0 0:00.01 migration/1
A check with "ps" indicates that devkit-disks-da did NOT exit when udev
was restarted, but did cease consuming large amounts of CPU and spinning
the disk. There may be intersecting bugs here.
--
devkit-disks-da, gvfs-gdu-volume and dbus-daemon have abnormally high CPU usage
https://bugs.launchpad.net/bugs/481626
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