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Megadata is a proprietary operating system used in PT. KAI microwave communication master SCADA. It has been in operation since 1994. Because of its age, the vendor does not support it. The master mall function while its RTUs (Remote Terminal Unit) that seen within Java island still function. The master is running in proprietary hardware, so the software cannot run outside the system. One option to keep the system running is to reengineer the SCADA master. The first step in this process is to investigate all the information in master SCADA. All the system configurations are stored in the master hard disk, but its file system is unrecognized by DOS, Windows or Linux, and by an open-source forensic software Autopsy. Reverse engineering Megadata file system is done to retrieve the necessary files. Its steps are: study literature, duplicate Megadata hard disk raw data, analyze the partition table, root directory, subdirectory, and data area. After analyzing, the detail file system is revealed. It is a modified ext file system used in Linux.