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 <ro...@mac.com> 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 <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 >>> > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> Regards, Stephen Chape
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