Hmmm. Might this has something to do with that in windows users generally like to make couple of different drives C/D/E and in linux environment people usually use whole hard disk without partitioning it (only perhaps home dir and swap of course).

.edit
And in the end we are fundamentally talking here about core of linux and how it´s File system is made and how different modules of apps are laid across file-system.
http://linux.oneandoneis2.org/LNW.htm