But I'm trying to infer something from your question... forgive me if I'm way off track...
Most PC systems come with just a "C" drive as a hard drive, i.e. it's not partitioned.
You might then choose to partition it further giving several partitons on the HDD...
Some PC systems come with a "Restore" disc which can be used to restore the system to an "as new" state. I believe that the use of some of these will permit the new partitons to remain, others will return the system to a single useable partition.
I know that doesn't exactly answer the question you asked, but it might help someone reading to understand what can happen.
As usual I'm open to correction!