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