Team Continues Analyzing Spirit Computer Reboots and Amnesia Events

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA 91109. TELEPHONE 818-354-5011
http://www.jpl.nasa.gov

Guy Webster 818-354-6278
Jet Propulsion Laboratory, Pasadena, Calif. April 20, 2009
Guy.Webster@jpl.nasa.gov

Team Continues Analyzing Spirit Computer Reboots and Amnesia Events

Mars Exploration Rover Mission Status Report

After three days of completing Earth-commanded activities without incident last week,
NASA's Mars Exploration Rover Spirit had a bout of temporary amnesia Friday, April 17,
and rebooted its computer Saturday, April 18, behavior similar to events about a week
earlier.

Engineers operating Spirit are investigating the reboots and the possibly unrelated amnesia
events, in which Spirit unexpectedly fails to record data into the type of memory, called
flash, where information is preserved even when power is off. Spirit has had three of these
amnesia events in the past 10 days, plus one on Jan. 25. No causal link has been determined
between the amnesia events and the reboots.

The most recent reboot put Spirit back into an autonomous operations mode in which the
rover keeps itself healthy. Spirit experienced no problems in this autonomous mode on
Sunday. The rover team at NASA's Jet Propulsion Laboratory, Pasadena, Calif., revised
plans today for regaining Earth control of Spirit's operations and resuming diagnostic and
recovery activities by the rover.

"We are proceeding cautiously, but we are encouraged by knowing that Spirit is stable in
terms of power and thermal conditions and has been responding to all communication
sessions for more than a week now," said JPL's Sharon Laubach, chief of the rover
sequencing team, which develops and checks each day's set of commands.

During the past week of diagnostic activities, the rover has successfully moved its high-
gain dish antenna and its camera mast, part of checking whether any mechanical issues with
those components may be related to the reboots, the amnesia events, or the failure to wake
up for three consecutive communication sessions two weeks ago.

Spirit and its twin rover, Opportunity, completed their original three-month prime missions
on Mars in April 2004 and have continued their scientific investigations on opposite sides
of the planet through multiple mission extensions. Engineers have found ways to cope
with various symptoms of aging on both rovers.
The current diagnostic efforts with Spirit are aimed at either recovering undiminished use
of the rover or, if some capabilities have been diminished, to determine the best way to
keep using the rover.

Laubach said, "For example, if we do determine that we can no longer use the flash
memory reliably, we could design operations around using the random-access memory."
Spirit has 128 megabytes of random-access memory, or RAM, which can store data as long
as the rover is kept awake before its next downlink communications session.

JPL, a division of the California Institute of Technology in Pasadena, manages the Mars
Exploration Rover project for NASA's Science Mission Directorate, Washington.

# 2009-071

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