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I used to take an external harddisk with me, because I want to have my pictures and data available at all times. So I encrypted the thing then. Now that I am not "on the road" anymore, encryption is not needed anymore, so how can I undo the encryption?
iMac 27″, macOS 10.13
https://support.apple.com/en-ca/guide/mac-help/mchlp2560/mac - image it would be similar for external drive
Turn off FileVault encryption on Mac
When you turn off FileVault, encryption is turned off and the contents of your Mac are decrypted. The decrypting could take a while, depending on how much information you have stored. However, you can still use your Mac to do other tasks while the information is being decrypted.
> System Preferences, click Security & Privacy, then click FileVault.
, click it to unlock the preference pane.https://support.apple.com/en-ca/guide/mac-help/mchlp2560/mac - image it would be similar for external drive
Turn off FileVault encryption on Mac
When you turn off FileVault, encryption is turned off and the contents of your Mac are decrypted. The decrypting could take a while, depending on how much information you have stored. However, you can still use your Mac to do other tasks while the information is being decrypted.
> System Preferences, click Security & Privacy, then click FileVault., click it to unlock the preference pane.I didn't use Filevault, but instead in Finder I select the harddrive. Then right-click and select Encrypt <drive name>.
Now, when I select the encrypted drive, it is greyed out. So it seems to me I can't undo the encryption
Follow this external Link ( safe site ) How to Decrypt External Drives on Mac (osxdaily.com)
Disk encryption
