r1308
Objects that are private and never changed don´t need to be volatile (changed to final) Lock was volatile when it doesn´t need to be (uses synchronized and never changed - thankfully).

r1307
wrong argument to String.format would cause a exeception if that branch was ever executed (put in the correct value)

r1306
make a constant final and close some unclosed file inputstreams.

r1305
Avoid possible overflow in int multiplication

r1304
Inlined a few methods in UmdIsoFile (removing a new DataInputStream)