How to rescan and remount drives on Ubuntu Hardy or Jaunty?

Question

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.

Answer 1

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)

Answer 2

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.