Ah the good old days of DOS

Still very useful when all else fails.
You can take it all a stage further...
If your prompt relates to the C drive, but you want to mess up say your D drive, or floppy drive A, you can create your directory (sorry folder)
Code:
MD D:\folder\subfolder
To be really clever, albeit that it's not truly dos compatible (only allowed 8 characters, plus a suffix of 3) you can create a long file name directory using quotes:
Code:
MD "D:\folder\long folder name"