When I connect my external drive, which has 4 partition, it opens 4 nautilus windows. When I connect a pen-drive, it opens another one for that. Is there a way that new windows will create a tab in an open instance of nautilus, and if there isn't any instance open, create a new one, and open further windows in that.
Thanks.
It is possible to use middle-click to open tabs. It can't be made default yet.
As far as I know this is not available in Nautilus, however as an alternative you can install PCMan File Manager from the software centre which supports tabs here is a link to their homepage which has all the details
Nautilus in natty alpha 2 has open in new tab on the right click menu.