Very simply. The APIs you need are GetLogicalDriveStrings and GetDriveType. The code below is a command line program which enumerates all the drives on the host machine and lists them together with their types.

#include "stdafx.h"
#include "windows.h"

int _tmain (int argc, _TCHAR* argv[])
{
   TCHAR atchDrives [150];
   TCHAR atchResult [50];
   TCHAR * ptchDrive = NULL;

   if (GetLogicalDriveStrings (sizeof (atchDrives), atchDrives))
   {
      if (strlen (atchDrives) > 0)
      {
         ptchDrive = atchDrives;
         do
         {
            switch (GetDriveType (ptchDrive))
            {
               case DRIVE_UNKNOWN:
                  wsprintf (atchResult, "%s : Unknown type", ptchDrive);
                  break;
               case DRIVE_NO_ROOT_DIR:
                  wsprintf (atchResult, "%s : No root directory", ptchDrive);
                  break;
               case DRIVE_REMOVABLE:
                  wsprintf (atchResult, "%s : Removable", ptchDrive);
                  break;
               case DRIVE_FIXED:
                  wsprintf (atchResult, "%s : Hard Disk", ptchDrive);
                  break;
               case DRIVE_REMOTE:
                  wsprintf (atchResult, "%s : Remote (network) drive", ptchDrive);
                  break;
               case DRIVE_CDROM:
                  wsprintf (atchResult, "%s : CD/DVD", ptchDrive);
                  break;
               case DRIVE_RAMDISK:
                  wsprintf (atchResult, "%s : RAMDrive", ptchDrive);
                  break;
               default:
                  wsprintf (atchResult, "%s : ERROR", ptchDrive);
                  break;
            }
            printf (atchResult);
            printf ("\n");

            do ++ptchDrive;
            while (*ptchDrive);
            ++ptchDrive;

         } while (strlen (ptchDrive));
      }
   }
   return 0;
}

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