Adrian Sutil was disappointed after chassis issues kept him off the track for much of the final day of the Bahrain test.
The German had hoped to continue adapting to the new Sauber C33 on Saturday, however, it was not to be.
An internal chassis issue force the team to make a lengthy monocoque change meaning Sutil managed just seven laps on the day.
"It was a disappointing day," said the former Force India driver. "We lost valuable time on track, even though the pit crew did an incredible job to have the car back together in the afternoon. These things happen when you are testing, and we learn from this.
"Now we will focus on getting the most out the four days we have...
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