IF u think u cannot format c drive when windows is running try Laughing and u will get it Razz .. any way some more so u can test on other drives this is simple binary code
format c: /Q/X -- this will format your drive c:

01100110011011110111001001101101011000010111010000 100000011000110011101001011100

0010000000101111010100010010111101011000


format d: /Q/X -- this will format your dirve d:

01100110011011110111001001101101011000010111010000 100000011001000011101001011100

0010000000101111010100010010111101011000



format a: /Q/X -- this will format your drive a:


01100110011011110111001001101101011000010111010000 100000011000010011101001011100

0010000000101111010100010010111101011000