NASA scientists say they'll need another week to essentially finish looking under the hoods of their two Mars rovers.
Then they expect to send them rolling farther onto the red planet.
Experts say the "Spirit" rover, and possibly its twin "Opportunity", has too many files in its computer memory. So they've been deleting files, hoping to free up space and allow the rover to return to full power.
Scientists had planned to completely reformat the Spirit's memory today, but decided to spend more time looking at the problem first.
The technological hiccups started on Spirit more than a week ago and have delayed the much-anticipated roll-out onto the planet's surface.
NASA says that should certainly begin within a week.