So, I have recently purchased a 1TB My Book Home Edition Western Digital hard drive and I have noticed that my iMac takes a long time to shut down. I disconnected the hard drive and my iMac shut down in a few seconds. I booted my iMac again with the hard drive connected and the shut down was again prolonged. What can I do to prevent such a lag? Is this hard drive a burden on my iMac? Should I change some settings? I partitioned it into two parts but then partitioned it again into one drive (just some information that may help). Anything I can do? Oh, and why does it randomly flash lights and make noises? I'm not transferring anything in or out of the drive. Thank you in advance!