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This test "bends" the monitor to make sure the screen does not crack under external pressures.
This is one of the many drop tests Lenovo conducts. The robotic arm lifts the laptop to about 1.5 meters above the ground before releasing it to see if the device can withstand such shocks.
The corner drop test makes sure the laptop is still functionable even when the user drops the device and it lands on one of its corner edges.