Level 1

11 points

Disk not ejected properly

Hi I'm having this issue since I upgraded to Mavericks where almost every time I put my computers to sleep I get the "Disk not ejected propoerly" message and every disk but the system one is not mounted and cannot be found by Disk Utility.

I have a Mac Mini late 2009 and a Macbook Pro 15 mid 2009 and I'm having this issue in both machines. Never had any issues before in any of my machines, not in Leopard, Snow Leopard or Lion.

On my Mini I have two external USB drives and on my MBP I have a SSD, where the system is installed, and a HD (I replaced my optical drive with a bay to install the extra disk).

I researched the issue and found a couple of threads where people sugested to buy a 3rd party app that would unmount the disks at sleep and remount them at wake, but I think this shouldn't be a issue, since it never happened with any version of OSX I had used before.

Is anybody else having this issue as well? Is there any word from Apple on this subject? Can I hope for a fix?

Thanks

MacBook Pro, OS X Mavericks (10.9)

Posted on Oct 28, 2013 9:55 AM

Top-ranking reply

Jeffrey Frankel

Level 1

48 points

Posted on Sep 1, 2017 5:18 AM

I ran into the same problem. In my case, the culprit was the type of surge suppressor I was using. This is the kind that turns off power to all the the outlets when the main outlet senses that the device plugged into it has powered off. When my iMac, plugged into the main outlet, went to sleep, this was sufficient to turn off power to all the other outlets, including those that my external drives were plugged into. After I plugged those drives into a second surge suppressor, they now remain powered on when the iMac is sleeping and I no longer get the "Disk not ejected properly" message. An added bonus is that the drives spin down during sleep, whether or not I tick the "Put hard disks to sleep when possible" checkbox in Energy Saver, and whether or not I select the "Automatic" setting on the drives' three-position on/off switch.

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493 replies

macfanta

Level 1

28 points

Oct 12, 2015 5:08 PM in response to NuXPeR

I have no more issues with clean install El Capitan and 'Mountain' app installed and working

Toshiba 1TB Canvio USB

Seagate 2TB Backup Slim USB

Seagate 5TB Expansion USB

Nov 2, 2015 2:43 PM in response to longtimeuser

ps - this topic should not be limited to one operating system in the discussion hierarchy.

Nov 2, 2015 7:52 PM in response to KenV54

I'm talking about Apple's online store through the Apple site.

As to the bug report, I'll look for the next opportunity.

Thanks

Nov 4, 2015 1:13 PM in response to iPhabio

I too have this problem. Preferences did not have that file and although I did all the other parts of the post, it didn't work. Looks like it is just one of many El Capitan problems.

JimiDean

Level 1

0 points

Jan 8, 2016 12:50 AM in response to Robster50

Thank you, this worked for me on El Capitan.

cvpacs

Level 1

4 points

Mar 14, 2016 2:35 PM in response to iPhabio

This also worked for me as I had migrated to a new MacBook. Huzzah!

freeuse

Level 1

4 points

Apr 2, 2016 2:31 PM in response to JimiDean

Would you please let me know how can you fix the problem?

As the post to long,not easy to find out the solution.

Thanks a lot.

Mitch 751

Level 6

11,644 points

Apr 7, 2016 3:18 PM in response to Jim Show

HHave you tried to reinstall your OS?

Mitch 751

Level 6

11,644 points

Apr 7, 2016 3:45 PM in response to Jim Show

I Am not too sure. But it worked in my case. I think I got some system corrupted

Sep 3, 2016 10:17 AM in response to Bob Sabiston

I put a new connecting cable from the Mac to the ward drive. No problems whatsoever since, but it did it 100% of the time before.

Sep 3, 2016 4:10 PM in response to Bob Sabiston

As with alisonfromulverston I replaced the USB 3.0 cable on my external RAID and haven't had a single DNEP error since. You should try it.

Sep 26, 2016 3:43 PM in response to nicwilson58

I hope you are correct. Have not been able to corroborate yet online and haven't been offered Sierra. Figure I will wait until Apple tells me its available.

Eric Root

Level 10

685,221 points

Nov 24, 2016 9:26 AM in response to jordan11685

Yes to both questions.

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Disk not ejected properly