Mac shuts down when I turn my external hard drive

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Level 1

35 points

Mac shuts down when I turn my external hard drive

Hello,

I installed Yosemite 2 days ago, and something when wrong right away: when I turned off my LaCie external hard drive, my 27 inches iMac immediately shuts down (I tried a couple of times), to restart a few seconds later. A message lets me know if I want to send a notice of the problem to Apple (which I did), and then everything is fine. Except its not, and whenever I turn off that hard drive (that is connected through thunderbolt), same thing happens. It never happened with the previous OS, so I hate myself right now for moving onto Yosemite.

Does anyone when through the same thing, and possibly has a fix ? Thanks.

iMac, iOS 8.1.3

Posted on Feb 18, 2015 8:46 AM

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Answer 1

Kikrok Author

Level 1

35 points

Feb 18, 2015 8:47 AM in response to Kikrok

It's in fact OSX Yosemite 10.10.2

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Answer 2

Feb 18, 2015 9:28 AM in response to Kikrok

Hmmm. Did you ever install any external software (i.e. some LaCie installer disk) or something? That's my guess, that you have 3rd party software (which is totally not necessary) which is incompatible with Yosemite and is causing a kernel panic. The solution would be to uninstall the software - it is never necessary to use 3rd party software to use a hard disk, and it can cause system instability and data loss.

If you don't know how find this out, you could download and run a program called 'etrecheck' (just Google it) and post the output here.

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Answer 3

Eric Root

Level 10

684,027 points

Feb 18, 2015 2:20 PM in response to Kikrok

Startup – Computer restarts by itself – Yosemite

The next time it does this copy and paste the report to Apple in a reply. Screen shots are hard to read.

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Answer 4

Linc Davis

Level 10

209,535 points

Feb 18, 2015 2:48 PM in response to Kikrok

This a known bug that affects Thunderbolt 2 storage devices. The only workarounds I know of are not to turn off the drive, or to connect it with USB 3 instead of Thunderbolt.

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Answer 5

Kikrok Author

Level 1

35 points

Feb 18, 2015 11:17 PM in response to William Lloyd

No I didn't install any software that was given with the hard drive, cause it worked perfectly (well, it used to) without it. So I don't think it's that. But thanks anyway !

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Answer 6

Kikrok Author

Level 1

35 points

Feb 18, 2015 11:19 PM in response to Linc Davis

@LincDavis

Ok, good to know ! I hope they come up with a fix soon, but meanwhile I'm glad to see that it's not some kind of problem with my computer.

Thank you all !

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