I'm using a 1TB WD My Passport Ultra for my Time Machine Backup drive. I'm working on a MBP running Mavericks. Noting that every time the MBP sleeps it also puts the WD drive into sleep mode and "ejects" it. I get the warning that the drive was not ejected properly. The icon for the drive disappears from the desktop and Time Machine cannot see it. The drive is also not listed when I open finder after this happens. My only solution has been to unplug the USB cable and then plug it back in, at which point the drive is recognized and Time Machine will work. I went into the WD application manager and changed the sleep setting to "never" but it did not stay in that mode. There is a warning that the OS my override this. How do I set up the WD drive to work with OSX not to shut down and eject the disc?