Looks like the d/ is your recovery (contains a reinstall of your OS). Google and see, but I suspect if you do you will be able to reboot, hit F? (see google for your make/model) and you can restore your computer to the day it was shipped to the store.
I think reformatting may be automatic, or presented as an option.. In any event, my computers were a little older and I had to reformat via the XP cd, and reinstall from the cd..
Others may chime in who have worked directly with the restore partition (I think thats your d/)
Is there a reason you want a full reformat?
Edited by rosiesdad, 25 December 2009 - 12:21 PM.