Currently Being ModeratedAug 3, 2012 6:22 PM (in response to iamapple)
I have similar problem. When I upgraded to ML just about all USB devices I have disconnect except my magic mouse. I have 2 external drives, 1 500 GB I use for TM and the 1TB I use for storage. Also a logitech K750 keyboard with its own usb dongle. When my system goes to sleep everything disconnects except for my magic mouse. The only option is to restart the system then everything work fine on reboot. When going back to sleep same thing happens again. I have gone in sys pref and unchecked all 4 options in energy saver. I'm looking for a solution as well.
Currently Being ModeratedAug 4, 2012 1:34 AM (in response to iamapple)
I have the same problem. Just upgraded to Mountain Lion. Now my 27" iMac (2008) improperly ejects my 2TB Western Digital external drive everytime it goes to sleep!
Can anybody help?
Currently Being ModeratedAug 4, 2012 6:13 PM (in response to Reevesrl)
Am having exactly the same issue with a LaCie d2 Quadra 3GB connected via FW800. From what I've seen in the limited information on various forums, the issue seems to be related to Mountain Lion and how it handles wake from sleep rather than a specific brand of drive. I am now running Caffeine when my iMac is turned on during the day to avoid the system going to sleep. Not ideal but does (so far) seem to have the benefit that since there is no sleep there is no random eject.
Roll on ML .1 update and hope a fix for this is included. I too did not have the issue with Lion but after the upgrade it's been a daily occurrence. .
Currently Being ModeratedAug 5, 2012 10:15 AM (in response to iamapple)
After it posts the message about improperly ejecting does it actual "re-mount" the drive??
That's what I see on one - but not all - my drives.
Do you see any unusual message after it wakes up? I see a lot of these:
8/5/12 1:05:11.000 PM kernel: disk0s3: media is not present.
but then it actually mounts the disk and, in fact, all seems no worse for wear.
Currently Being ModeratedAug 5, 2012 10:22 AM (in response to Steve Holton)
Mine does not "re-mount" the drive until after rebooting. We need a OS 10.8 bug fix. I will install Caffeine but it's not the way I want to leave computers overnight. Guess I could always shut them down, but don't want to do that either... every night.
Currently Being ModeratedAug 5, 2012 10:26 AM (in response to iamapple)
Also just recently upgraded to mountal lion and my problem is biger...EVERY external devic I use ejects aftre a few seconds I can not backup or import from any device ... now that is very frustrating .......
Currently Being ModeratedAug 6, 2012 12:16 AM (in response to jmbell)
Likewise mine does not remount the drive - proudly leaves the "you didn't eject the disk properly silly!" message on display. I have up to date AV software Chrisphoto and have had the problem before and after definition and component updates (running Norton Internet Security for Mac).
Interesting finding (so far) is that I have pulled out my main LaCie 3TB (just noticed I said 3GB - duh - showing my age in IT) and replaced this a LaCie 500GB USB drive (USB powered - not separate power supply) and so far all fine. I purposely did not run Caffeine while I left the Mac on all day when I was at work.
So wondering if the ML issue with the random disk eject is related to size or power source of drive (clutching perhaps I know). I have seen others report the same problem with 1TB so suspect it's not a drive size factor.
If the 500GB continues ok for a day or so I will try some other USB drives I have. Just trying to narrow down what the common factors if any may be.
The d2 Quadra 3TB from LaCie is only a month or two old and was not cheap - paid more to get a quality product rather than basic consumer - so I will be rather annoyed if it turns out the problems with LaCie firmware talking to ML rather than with Apple. From some other forums, seems LaCie have not generally been fast to resolve issues with their drives.
jmbell - last night I left my iMac running but just ejected the external drive. Do did not need Caffeine and for me the external is more long term storage rather than used for downloads in the first instance. If the problem persists I may go looking for an apps that keeps the disks spinning but lets the screen go into energy save mode.
Currently Being ModeratedAug 6, 2012 2:11 AM (in response to iamapple)
Same issue here, but funny enough only with one of my 3 Firewire drives, which happend to be an SSD.
No visible eject message, the ap that accesses the drive (Lightroom) just will no longer react. The drive appears as mounted in Finder, but clicking on it hangs the window.
Annoying. Very much so.
Currently Being ModeratedAug 6, 2012 2:19 AM (in response to iamapple)
Update to my earlier comment:
My 27" iMac (2008), just upgraded to Mountain Lion from Snow Leopard, now improperly ejects my 2TB WD hard drive everytime it goes to sleep. When it comes back to life it remounts the drive, but gives me a message about I did something wrong. I'm worried that eventually this repetitive process will damage the data on the external drive.
Currently Being ModeratedAug 6, 2012 2:40 AM (in response to Reevesrl)
Likewise my concern and why I'm ejecting my 3TB LaCie when not using it. From the growing list of comments there does not seem to be any similarity or common factors.
I have seen comments re Mountain Lion and laptop battery issues in the media but not a lot of threads re this disk eject problem yet so wondering if it will make the list for Apple to look at for the .1 patch update.
While the lack of obvious common factors is a pain, it does seem to strongly suggest it's Mountain Lion rather than firmware from a specific manufacturer or a particular mode of connection (FW, USB etc).
For the moment I'll stick with Caffeine when I need to be sure the "offending drive" stays mounted. Not ideal but at least the files are there when needed and it reduces the risk of file system corruption from the device going offline at an inappropriate moment.
Currently Being ModeratedAug 6, 2012 2:49 AM (in response to iamapple)
Just done some more forum searches and this issue is appearing in several now, including multiple in MacRumors. Someone said they were going to put in a support ticket to Apple, so hopefull this will help our collective cause. Apart from this issue, and some occasional Mail funnies (seems to "lose" the network and I have to manually "Get Mail"), I like Mountain Lion a lot.