The USB stick need to be unmounted but still powered on.
There are various ways to achieve this:
- Disable automounting in Tracker. When you connect the disk, it will be powered on, but not mounted.
- Unmount the disk from DriveSetup
- Disable “eject when unmounting” setting in Tracker, then unmount the disk
- Select “do not mount” when Tracker asks you what to do with the disk (but it only does so for certain filesystems)
There is one way that will indeed not work:
- Unmount the disk from Tracker with “eject when unmounting” enabled. This will not only eject, but also power off the USB drive so you can remove it “safely”. So after doing this it is not possible to access the drive in any way anymore
Eventually we will add “write image to disk” support to DriveSetup (which will then take care of unmounting as needed), to make this process a little easier.