What's the size of this 'C' drive? If it's almost 200GB, then there is no place to make any additional partitions.
Use a Partition Resizer to reduce the size of this 'C' and then you can make additional partitions in the freed space.
Much more info has been posted in many other postings in this site!!
Hope this helps.
I just bought a Sony RA820 with 200G hard disk, however I found there is only one local drive (C), I tried to create another local drive for data and media storage just in case my operating system fails and I should lose everything. I checked the support and help areas for creating partition, but both methods in window interface and DOS interface are not working after I followed the instruction.
Where can I get references for this task?