Carlos Sainz says he and Scuderia Toro Rosso can be satisfied with its efforts on the first day of F1 testing in Jerez, despite technical problems consigning the team to an early finish.

The Spaniard completed 46 laps in the new STR10, setting the sixth fastest time of the seven drivers on track, but missed the final stages due to issues on the Renault-powered car.

Despite this, rookie Sainz says - compared with STR's disastrous start to the season in 2014 - it can be happy with the information collected over the course of the day.

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"It's been a very busy day, but a day I've been looking forward to for a long time," he said. "Driving out for the first time was a very exciting moment, but after that it was time to get to work. It's been a positive day, where we were able to complete plenty of laps - 46 won't seem a lot if you compare it to Mercedes, but compared to what the team did this time last year, it's much more, so we can be satisfied.

"Unfortunately we had to end the day before time, but it was no big issue; we can't forget that this is testing and there's always small issues that need to be sorted.

"As there was not much time of the session left, we decided not to go out again and check that everything was okay and start preparing for tomorrow, instead of doing it in a rush, going out too quickly and then regretting it."

Team-mate Max Verstappen will drive the car on the second day of testing.