For Windows users, when installing Dropbox the user has no option but to allow DropBox to sync data with the C drive. Many Windows based PCs are now shipped with a smaller C drive (for apps) and a larger D drive (for data). Many folks also use external drives for data.
Please give users the option to choose which drive they wish to sync with.
I recently had to reset my PC. When I re-installed DropBox, I wasted about 2 hours syncing, resetting the default drive and re-syncing.
Thanks, James