I've got a LaCie 2TB external SSD drive that i would like to decrypt. I tried the method found online of right clicking the drive in finder however there is no option to decrypt the drive there, I tried using the "diskutil cs revert" command in terminal and that didn't work either. I also tried doing it using disk utility itself and the option to decrypt wasn't there either. I'm running macOS catalina 10.15.4
Decrypt external hard drive mac os catalina
encryptionhard drive
Related Solutions
Quit Disk Utility. Try this command in the terminal:
defaults write com.apple.DiskUtility DUDebugMenuEnabled 1
Relaunch Disk Utility. Select Show every partion from the now present Debug menu. See if you can find some hidden partitions and remove them!
Apparently I was asking the wrong question. After attaching this "corrupted" drive to another Mac, it simply asked for the password and mounted the drives with all their data as normal. I let the other Mac finish the encryption process, reinstalled OS X on my main machine and reconnected the drive and it now works perfectly.
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Best Answer
What file system is your external drive? I have an external APFS volume and there is the 'Decrypt' option in finder so I am guessing that feature is fs-dependent.