When I connect an USB drive to an Ununtu Hardy and Jaunty system, the system mounts the partitions found on the drive, and opens a Nautilus window for each mounted partitions. Within Nautilus, I am able to unmount partitions.

What I need is a command or action which forces the system to rescan the available drives and partitions, and automount each not mounted partition, including those which I've manually unmounted from Nautilus. sudo /etc/init.d/udev restart or ... reload doesn't do this.

As of now, I just unplug the USB drive, and commect it again, which will force a scan and a mount on that drive. But I want to do force the rescan and remount without unplugging anything, preferably without the user having the know device or drive names.

2 Answers 2


Try triggering the add rule to udev. The default action is add. ( probably what you want)

# udevadm trigger --subsystem-match=block

you can call

# udevadm settle --timeout=60

to wait for udev to finish doing it's thing. (in this case 60 seconds, default is 180seconds)

  • Sorry, neither of these commands work. After trying them, and waiting for something to happen, and giving up, I had to disconnect the USB cable, and connect it again to make udev recognize the device. Do you have a command which you have tried and it works?
    – pts
    Dec 21, 2010 at 23:24

sudo unmount -a and sudo mount -a will do the job,but only if the device is not busy(in use). All of the file systems described in /etc/mtab are mounted or unmounted.But after I tried it with USB,It turned out be OK.

  • 1
    You wrote twice "mount". Did you mean one of them to be "unmount"?
    – Gnoupi
    Aug 15, 2010 at 7:13
  • I am sorry,that is a typo.I have corrected it.
    – schemacs
    Aug 16, 2010 at 9:54
  • I can't accept this answer, because it has a side effect that it umounts already mounted partitions. I need a solution which doesn't touch existing mounts.
    – pts
    Dec 21, 2010 at 23:20
  • Note that the command to unmount is mistyped, it's actually umount
    – drodsou
    May 20, 2015 at 9:39

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