Samsung TS-H542A-WRCH - Manual (Page 11)

a : Slave Drive (Select the SL jumper)
b : HDD
c : MotherBoard
When you use two E-IDE cables
Set the jumper to MA (Master) in the Master/Slave port in the back of the DVD R/RW Drive.
When you have one DVD R/RW Drive: Set it to MA (Master)
a : Master Drive (Select the MA jumper) b : HDD
c : Motherboard d : Primary 1
e : Secondly 1
When you have one DVD R/RW Drive and the other ODD products: Set it to MA (Master) /
SL (Slave),
and Connecting Cables
Installing DVD R/RW Drive