OS X 10.8.5 causes external disk to eject improperly

Hi,

I have same problem with my imac with fusion drive and ext 1t LaCie drive using thunderbolt connection.

Any solution?

Jim

Me to. Same problem right after 10.8.5 and i even used the combo updater. I always does just to be safe. Didn't work this time, somethings wrong in the 10.8.5 update for external drives for sure. It happen on 3 of our new iMac 27"

Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.

Feedback

Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.

Feedback via Apple Developer

I have the same set up and the same problem. I called AppleCare and they were not aware of the problem, but indicated that the only way such a problem can be solved is through an update. A problem report was submitted.

Exact same problem here. I have reported it to Apple as well as Lacie, my external HD maker. I believe it to be a 10.8.5 bug. I have disabled the sleep on my iMac, so far so good. If I do want my iMac to sleep for an extended period I will just unmount & switch off the external HD. If you have the bug & have not reported it to Apple, please do so.

Same problem with G-Technology G-Raid Thundebolt 4TB and reported to Apple.

I am having the same problem with a couple of external RAID arrays on USB3. I have solved this problem previously by unchecking "Put hard disks to sleep when possible" option in the "Energy Saver" system preference panel but the problem has returned in 10.8.5. It seems that despite the option being unchecked, the HDs still spin down. There is some other chains on this HD sleeps issue and it has been discovered that they are spinning down with the monitor going to sleep. The easiest work around to this problem at the moment is to set the "Display sleep" option to "Never". Worked for me.

Hello Everyone, I am Jimmy too

Welcome to Apple Support Communities!

To remove ANY kinds of external drives, eject them. Ejecting it will disconnect all running process like copying etc... If you do not eject, it is possible to make a bad sector or damage the file that you are copying.

Cheers,

Jimmy

From another discussion on the same topic - posted by Carlos Guerrero

However, I can state that Apple support is aware of this "bug" with 10.8.5. I spoke with Apple support techs after receiving phone calls from them from my feedback submission. They state they are working on it but there is no ETA.

Hello, I am a little late but I don't think the issue is caused by OSX 10.8.5, because I experienced the same problem long before updating to Mountain Lion. Same problem (not very often) with Lion. The problem must be as Barry said in the "energy saver" system. It has not been solved wiht 10.8.5 apparently.

BR

Constance

It is official(-ish), there is a bug in 10.8.5 and an update is on the way:

"- Fixes an issue that may cause external drives to be ejected after the computer goes to sleep"

http://www.macrumors.com/2013/09/24/os-x-10-8-5-supplemental-update-being-prepar ed-to-address-facetime-camera-and-other-issues/

I was experiencing the same error message after the update after waking my iMac from sleep with two bew LaCie external drives connected to my iMac's Thunderbolt ports. Three days of troubleshooting with a very helpful senior level tech (and an examination of my pertinent system files by Apple engineering) revealed that the 10.8.5 update apparently changed the power the iMac uses when going into hibernation, and the LaCie drives do not recognize that there is enough power, or any power, to properly eject them prior to sleep. The tech urged that I disable the sleep settings and contact LaCie to see if they have issued any firmware updates since Apple released 10.8.5.

I was directed by Apple support to contact LaCie (maker of my two external drives that have been ejecting improperly on sleep) to see if they have issued a software update after OSX 10.8.5. They said that are not planning on issuing one, so we will be have to await an update by Apple to fix the bug. As reported above by BarryFromKemptville, MacRumors is reporting that an update from Apple is in the works.

http://www.macrumors.com/2013/09/24/os-x-10-8-5-supplemental-update-being-prepar ed-to-address-facetime-camera-and-other-issues/

As soon as I recently installed 10.8.5 it started disconnecting my external drives also. In my case, I am using 2 G-Tech drives. I have reported this to Apple. It appears this is a known issue from a number of posts I have read.

This issue has been fixed by the latest update to 10.8.5. Check your iMac for updates and do so. It corrected the problem on my iMac