Samsung TS-H492A-WBGH - Manual (Page 11)

a : Master Drive (Choose the MA Jumper) b : Hard Drive
c : MainBoard d : Primary 1
e : Secondly 1
If there is two Optical drive, select MA (Master) / SL (Slave).
a : Master Drive (Choose the MA Jumper) b : Slave Drive (Choose the SL Jumper)
c : Hard Drive d : MainBoard
e : Primary 1 f : Secondly 1
Installing a jumper on the master/slave select terminal
Setup