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Memory Reformat Planned for Opportunity Mars Rover
by Staff Writers
Pasadena CA (JPL) Sep 01, 2014

NASA's Mars rover Opportunity captured this view southward just after completing a 338-foot (103-meter) southward drive, in reverse, on Aug. 10, 2014. The foreground of this view from the rover's Navcam includes the rear portion of the rover's deck. The ground beyond bears wind-blown lines of sand. Image courtesy NASA/JPL-Caltech. For a larger version of this image please go here.

An increasing frequency of computer resets on NASA's Mars Exploration Rover Opportunity has prompted the rover team to make plans to reformat the rover's flash memory. The resets, including a dozen this month, interfere with the rover's planned science activities, even though recovery from each incident is completed within a day or two.

Flash memory retains data even when power is off. It is the type used for storing photos and songs on smart phones or digital cameras, among many other uses.

Individual cells within a flash memory sector can wear out from repeated use. Reformatting clears the memory while identifying bad cells and flagging them to be avoided.

"Worn-out cells in the flash memory are the leading suspect in causing these resets," said John Callas of NASA's Jet Propulsion Laboratory, Pasadena, California, project manager for NASA's Mars Exploration Rover Project.

"The flash reformatting is a low-risk process, as critical sequences and flight software are stored elsewhere in other non-volatile memory on the rover."

The project landed twin rovers Spirit and Opportunity on Mars in early 2004 to begin missions planned to last only three months. Spirit worked for six years, and Opportunity is still active. Findings about ancient wet environments on Mars have come from both rovers.

The project reformatted the flash memory on Spirit five years ago to stop a series of amnesia events Spirit had been experiencing. The reformatting planned for early next month will be the first for Opportunity. Even after the rover has been active for more than a decade and is currently about 125 million miles (about 200 million kilometers) from JPL, the rover team can still perform this type of upkeep.

Preparations include downloading to Earth all useful data remaining in the flash memory and switching the rover to an operating mode that does not use flash memory. Also, the team is restructuring the rover's communication sessions to use a slower data rate, which may add resilience in case of a reset during these preparations.


Related Links
NASA Mars rovers Spirit and Opportunity
Mars News and Information at
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Opportunity Mars Rover Suffers a Series of Resets
Pasadena CA (JPL) Aug 26, 2014
Opportunity is moving south along the west rim of Endeavour Crater heading towards 'Marathon Valley,' a putative location for abundant clay minerals. More recently, the incidence of Flash memory-induced resets has increased. The rover experienced resets on Sols 3754, 3757 and 3758 (Aug. 15, 18, and 19, 2014), which stops the onboard master sequence. Because of the project's vigilance ... read more

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