Why is this? I noticed that with my other Seagte Backup plus slim 2TB portable hard drive, it mounts right away, but this one takes a good few minutes before it will mount. When I first plug it into my mac pro via usb, I can hear a faint high pitched sort of squeaking sound while it is mounting, and stops when it has mounted. I tried doing a fresh reformat in disk utility, to make it just a single partition, and remove the bloatware off it, but this did not seem to help. It is a usb 3 powered drive connected my classic mid 2010 mac pro running mavericks.