So long as your using NTFS or FAT32 as your file system there is no need to creat extra partitions like you had to do in the old days with FAT16. NTFS and FAT32 feature smaller cluster sizes which dont change no matter how big the partition is (or up to its limitation anyway. 4TB for ntfs5?)
So stick with what you have, thats exactly what i do.
Incedently, just food for thought, i have been able to convert my primary partition (the one containing Win2K) from FAT16 to FAT32 to NTFS without any woes.