MacForensicsLab Write Controller is a software write-blocker. Write Controller prevents the Mac from automatically mounting volumes and maintains the integrity of suspect data, providing a layer of protection when working with important information. This allows a forensic examiner to image or explore the drive without fear of writing to it and compromising evidence. It offers an additional layer of security to prevent writing in addition to traditional hardware write-blockers.

MacForensicsLab Write Controller lets the user enable and disable automatic mounting (also known as Disk Arbitration) with the single click of a button. It also gives the user the ability to mount and unmount volumes connected to their machine.