As NASA's Curiosity Mars rover prepares for its surface mission, it will download the latest version of its operating system.

With NASA's Mars rover Curiosity safely on the Red Planet, mission controllers are now preparing the robotic explorer to begin its mission on the Martian surface.

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Engineers have been testing theCuriosity rover's instruments and systems ever since the spacecraft touched down on Mars on Sunday (Aug. 5 PDT; Aug. 6 EDT). So far, Curiosity is performing flawlessly, NASA officials said, and the next major procedure is to send the rover new software for its transition from its landing phase into the two-year long haul on the surface of the Mars.

"We're about to upgrade our software on the rover," Mike Watkins, Curiosity mission manager Mike at NASA's Jet Propulsion Laboratory in Pasadena, Calif., told reporters in a news briefing Thursday (Aug. 9). "Just like we upgrade our operating system on our home computer or laptop or something, we're going to do the same thing."

The new software will help mission controllers drive the $2.5 billion Mars rover, use its science instruments and operate its robotic arm.

"We want to switch to this new flight software that's optimized for surface operations," Watkins said.

Mission managers count Curiosity's days in "Sols," which are the number of full Martian days the rover has spent on the Red Planet. [Gallery: 1st Mars Photos by Curiosity Rover]

Curiosity will begin this software transition on Sol 5, which translates to Saturday (Aug. 11) on Earth. The software upgrade process is expected to last roughly four days, Watkins explained. During this time, all other activities, including science, will temporarily be put on hold.

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NASA's Curiosity Mars rover to get software upgrade (+video)