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Mars Orbiter: Rewrite of Onboard Memory


Waspie_Dwarf

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Rewrite of Onboard Memory Planned for NASA Mars Orbiter

Mission Status Report

Tables stored in flash memory aboard NASA's Mars Reconnaissance Orbiter (MRO) tell locations of Earth and the sun for the past 10 years, but not their locations next year. That needs to be changed. Carefully.

The long-lived orbiter relies on these tables to recover in the event of an unplanned computer shutdown. When the spacecraft computer reboots, it checks to see where it should position the antenna for communication and, even more critically, where it should position the solar arrays for power. Flash memory is "nonvolatile" -- meaning that it retains information even while the power is off -- so it works well for this backup role.

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