I have encrypted disk volume that is in the way and the passphrase is gone.
How can I erase the contents and reuse the disk space?
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To delete encrypted volume disk (not your main boot disk)
Unmount disk using
diskutil unmountDisk force /Volumes/disk2 (substitute /Volumes/disk2 with your disk)
Find disk UUID
diskutil coreStorage list
diskutil coreStorage delete [UUID] (substitute [UUID] with your disk's UUID obtained from the previous command)