How do I delete Codex media before returning it to camera?
When using Codex media formatted for ARRIRAW, VRAW, ProRes from ALEXA SXT, or recording with Onboard S - In the Storage screen, select the Dock and click the spanner/wrench, then click Erase. Warning - this operation cannot be undone.
When using Codex media formatted for ProRes from ALEXA XT - Use ‘Disk Utility’ on Mac OS X to reformat the drive with a FAT32 volume. Alternately reformat the media in camera.