I am using an iMac with Mac OS X 10.6.8. I have an external "Western Digital My Passport Essential SE" permanently connected to the iMac. The drive is formatted as Mac OS Extended. Earlier whenever I started the system the hard drive would show up in Finder & it worked great. Lately for some reason the hard drive does not show up. When I go to "Disk Utility" I do not see it there either. I have to physically disconnect & re-connect the drive for me to use it. Does anyone know why this is happening? I simply want the drive to be good to go when I start the system without having to re-connect it every time.