SatelliteL500D/ProL500DSeriesMaintenanceManual  G-1
AppendixG 
AppendixG Reliability
ThefollowingtableshowsMTBF(MeanTimeBetweenFailures)foreachcomponent.

TableG-1MTBF

Component Time(hours)
LCD 10,000
Keyboard 60,000
HDD 300,000
Optical(DVD/CD)drive 60,000
ACadaptor 60,000