which boot device to select

[1kado]

computer is asking: Please select boot device:
CD/DVD😛O-HL-DT-ST DVDRAM GHGON
HDD😛3-WDC WD6400AAKS-22A7B2
USB:Generic-Compact
USB:Multiple Flash
Which one should I choose

 

[Vympel]

You should select WDC for booting your OS.