from ctypes import * 
import time 
import win32file 
  
run = True 
logfile = open('.\\log.out','w+');#open log file 
input = raw_input("Input a string for disk name like \'d:\' or other:")#input a disk name 
while run: 
    sectorsPerCluster, bytesPerSector, numFreeClusters, totalNumClusters = \ 
            win32file.GetDiskFreeSpace(input) 
    freespace = (numFreeClusters * sectorsPerCluster * bytesPerSector) /(1024 * 1024)#get free space 
    logfile.write("%s %s FreeSpace is %d MBytes\n" % (time.asctime(),input,freespace));#write log 
    print  time.asctime(),input,"FreeSpace is",freespace,"MBytes"#output to screen 
    time.sleep(3)#wait 3 second 
logfile.close();#close log file