The MacBook Pro uses the Sudden Motion Sensor to protect the hard drive from being damaged when the computer is dropped or shaken. If you have disabled the sensor, it is a good idea to enable it again as soon as possible to prevent possible damage.

Do Macbooks have motion sensor?

The Sudden Motion Sensor (SMS) is Apple's motion-based data protection system used in their notebook computer systems. Since that time, Apple has included the system in all of their non-SSD portable systems (since October 2006), now the MacBook Pro and MacBook Air. ...

How do I turn off the sensor on my MacBook Pro?

Disable Sudden Motion Sensor on a Mac Laptop

Type the following at the command line: sudo pmset -a sms 0. Hit return and enter your password.