Hi Stephen, >> What model WD portable drive is it?
When the external drive is not showing on the desktop, have you checked if it is showing in Disk Utility? ... You should be able to select the volume in DU and then click "Mount". When your iMac goes to sleep, the light on the external drive should go off and the drive power down, and then when the iMac wakes it should power up. Definitely check as I mentioned before - if there is a Firmware Upgrade for your WD drive, the firmware upgrade could fix the problem. Cheers, Ronni Sent from Ronni's iPad4 On 16/08/2013, at 4:20 PM, Stephen Chape <[email protected]> wrote: > That could be what causes it Ronni. > I usually put the iMac to sleep when I leave it for a few hours. > In fact just came back to after about 3 hours and it had un-mounted again. > I will try not "sleeping" the iMac and see what happens. > > On 16/08/2013, at 8:44 AM, Ronda Brown <[email protected]> wrote: > >> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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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