use struct.unpack_from for disk

api/fileio.py

@@ -42,7 +42,7 @@ def read_stats(f):
 				mountpoint_size = ord(buf[index])
 				disk_fmt = '%dp %s %s' % (mountpoint_size + 1, fmt, fmt)
 				size = struct.calcsize(disk_fmt)
-				data = struct.unpack(disk_fmt, buf[index:index+size])
+				data = struct.unpack_from(disk_fmt, buf, index)
 
 				mountpoint = data[0]
 				total = data[1:1441]