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How to access damaged disk

I have connected my external hard disk to a windows computer. Now, when I try to connect it to my MacBook, it says "WD Drive Unlock will damage your computer. You should eject the disk".


It is still working fine when I access the disk back from the windows computer.


How can I get it to work from my MacBook without losing any stored data?


Thank you


MacBook Pro 15″, macOS 10.15

Posted on Aug 20, 2020 12:48 PM

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Question marked as Top-ranking reply

Posted on Aug 20, 2020 1:01 PM

If there's enough room:


  1. Copy all the files on the external drive to a temporary folder on your PC
  2. Erase the external drive with your Mac using ExFAT (as this works with Mac & Windows)
  3. Drag the files back from the PC to the external drive


Hopefully that will then work.

6 replies

Aug 21, 2020 6:01 AM in response to anwaargh

Did you try ctrl-clicking on WD Drive Unlock and choose Open?


You have apparently used Western Digital's encryption program to encrypt the drive and it is trying to run that program to unlock the disk. However, WD didn't code sign or notarize the app, so Catalina considers it malware.


If ctrl-click, Open doesn't work, then take it to a Windows computer and disable the drive encryption.

How to access damaged disk

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