Add Space to a partition

Well, not too much you can do really without using a partitioning program or adding hardware.  You could use Partition Magic (www.powerquest.com) to merge the partitions together or resize D: down to the end of the drive, then expand C: to fill in the now unallocated space.  There are free programs that claim to do this, but if there is anything critical on this machine, I wouldn't trust them.  Heck, I won't even trust PM without a backup of important files (rarely, things do go wrong with it...).  The other option would be to add an additional drive.  As long as your C: and D: are both NTFS formatted, you can use the Disk Management (Start/Run/diskmgmt.msc) tool to format a new partition on a new drive and "mount" it inside another folder on your existing C: drive to provide more space (or better yet use Ghost or another HD cloning utility to copy the current C: drive to a new partition on a new disk and expand it to 8GB or so).

Other than that...you can move your swap file from C: to D: to free up some space on C:.

Other options are available, I'm sure you'll get some more comments below.

-dog*

The fastest and easiest way is to make a new partition with the 20GB on D and mount it as a folder on C:.  So you would access it as C:\newfolder (or whatever you name it).  If you want it to be flat, ie: part of C without going to a subdirectory, this is a little more complex.  You'd have to put the data already on D somewhere else and then use a disk imaging program to move the entire contents of the old drive to the new one.  New disks come with utilities to do the moving as well as third party utilities such as Norton's Ghost.

Can you use the subfolder method or do you want exact help on moving the entire contents of the first drive to the second?

Not sure, but you may have to use Dynamic Disks to use the "Mount in a subfolder" option...

Thanks for the help.  Both partitions are Fat32.  Would the subfolder method solve the problem of system file space?  This problem occured when I installed visual studio.net on the D drive, which copied nearly a gb into the boot c drive as system files.  So i guess my question is, if I attempt this subfolder method, on future installs that add to the system files, would the files spill over into the newly mounted partition subfolder of C?  

Is there any way just to copy everything from C to D and make D the boot drive because there is still so much space on it.  Thanks again for all your answers.

If you don't mind erasing the D drive then there is either a utility that came with it or you can download from the manufacturer's website.  What brand and model is the new drive and do you mind erasing anything currently on it?

tazarman:
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If no comment from tazarman, split between magarity and myself, we both had workable suggestions and answered the question.

-dog*