My 2009 version Hard Drive does have a Blue light which is constantly on but flashes when active. This drive did develop a problem after 6 months failing to work with a regular clicking sound which indicated that the head was having problems. Rather than dumping the drive, I smacked it with a plastic ruler when the power was off and it has worked perfectly ever since. It is not a practice I would normally recommend, but has worked for me on a couple of occasions. The 2010 Hard Drive flashes only the drive is working.