Samsung SR-W04B Manual page 13

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