3.TestsandDiagnostics 
SatelliteL550/SatelliteL555/SatelliteL557/SatelliteProL550SeriesT&D28
Thescreenwilldisplayasbelowpicturetoshowthesubtestispassedorfailedwhenfinished:
Ifitisshowthepictureasbelow,itmeansHDDfunctionisOK
Ifthepictureshowsasbelow,itmeansheHDDfunctionisNG