Hi Stephen, Do you receive this message after the iMac wakes from "Sleep"? Some external drives will give this message when the computer wakes from an extended sleep.
What model WD portable drive is it? Have you tried other USB ports? 1. Check first if your WD external has a firmware upgrade available. In some cases, the firmware upgrade may be enough to make the disk more responsive to the iMac waking up. 2. If there is no firmware upgrade available, check if your power/data USB cable is properly working. Cheers, Ronni Sent from Ronni's iPad4 On 15/08/2013, at 7:07 PM, Stephen Chape <chap...@bigpond.com> wrote: > Hi Ronni, > > That item is already disabled. > My Time Capsule and my old wired modem had both been playing up recently. > So I replaced both of them with a Telstra WiFi Modem. > So I plugged in this spare HD and switched Time Machine to it. > I just can't figure why it un-mounts randomly like this ? > > I have the very latest OX on the latest i7 iMac. > > On 15/08/2013, at 6:44 PM, Ronda Brown <ro...@mac.com> wrote: > >> Hi Stephen, >> >> What OS X are you running? Is the WD external connected by USB of FW? >> >> First thing to check go into the "Energy Saver" preference pane in System >> Preferences. >> Check to see if you have enabled the item: "Put Hard Disk(s) to sleep when >> possible." >> If it is enabled, DISABLE it. >> This item is enabled by default but it is inappropriate for Time Machine >> use, so it should be disabled. >> >> Cheers, >> Ronni >> >> Sent from Ronni's iPad4 >> >> On 15/08/2013, at 5:20 PM, Stephen Chape <chap...@bigpond.com> wrote: >> >>> Hi folks, >>> >>> About a week ago I installed a 1TB WD Portable Hard Drive to use as my Time >>> Machine. >>> It has worked fine except for one point. >>> >>> Every so often I return to my iMac after a few hours away to find a message >>> that I have unplugged the hard drive without ejecting it. I have NOT >>> unplugged it. So I then unplug it and plug it back in again in order for it >>> to re-mount. >>> >>> Has anyone any idea why this happens and perhaps how to prevent it ? >>> >>> >>> Regards, >>> Stephen Chape >>
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