mac won't start with external drives

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mac won't start with external drives

My iMac Pro and 16" MacBook Pro both won't start (hangs at the Apple logo at startup) if I have external hard drives connected. I'm running 10.15.2 on both computers. The drives are 3 Promise Pegasus R6 connected via Thunder bolt 3 and a Lacie 6Big RAID. All the drives worked fine before updating to 10.15. My work around for now is to unplug the drives before I start the computer. Once the computer is up and running, I plug the drives in and they work fine. Something at start up doesn't like drives.

Thanks for your help.

Posted on Jan 2, 2020 9:35 PM

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Answer 1

brenden dv

Community Specialist

Jan 6, 2020 12:35 PM in response to kingdonut

Hello kingdonut,

Welcome to Apple Support Communities! I understand your iMac and MacBook Pro won't start up properly with your external drives connected. I'm happy to assist you with this.

Let's start by running first aide on the external drives to see if any repairs can be made to help resolve this issue: Repair a storage device in Disk Utility on Mac

If the issue persists, follow the steps in this article to resolve your issue: About Secure Boot

Best Regards.

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mac won't start with external drives

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