#!/usr/bin/env python
import sys
numReservedSectors = 38
bytesPerSector = 512
sectorsPerCluster = 8
numFATs = 2
fat1length = 7771648

def clusterToBytes(cluster):
	firstDataSector = (numReservedSectors * bytesPerSector) + (numFATs * fat1length)
	address = (((cluster - 2) * sectorsPerCluster) * bytesPerSector) + firstDataSector
	return address

start =  0x05DCC8800
middle = 0x05EED5800
end =    0x0614B3600

size = end - start
print size # 58633728

f = open(sys.argv[1],'r')
f.seek(start)
a = f.read(size)
f.close()

f = open("recovered.avi",'w')
f.write(a)
f.close()