A harddrive can be split into individual partitions (C:\, D:\, E:\, etc), for example if you only have one HDD, but want to separate your windows files from everything else you save on your computer. Think of it as virtual harddrives. The primary partition on an individual harddrive is the partition your computer can boot from (look for an operating system) when starting. The active partition when having multiple physical harddrives is the partition from which your computer actually will try to boot from, first. A basic drive handles partitions on a single harddrive. Drives set to dynamic can handle partitions that span over multiple physical harddrives, for example if you combine them to a RAID (most servers do this, as it's possible to recover much more data from RAIDS than from a single harddrives if one dies). Dynamic drives save the info about the location of their split partitions in an extra database. if you don't configure another drive to work with it, and specifically create a partition that spans both, pretty much nothing will happen, as the partition on that drive is still only present on that drive. That's pretty much all there is to it. You don't need to worry. Are you still having issues with your drives, other than that?