Samsung WA31273A Technical Manual page 22

Installation and Operation
4-5-1 Master and Slave Jumpers
You can daisy-chain two drives on the AT-Bus interface. When daisy-chaining two
drives, specify one drive as the Master, the other as the Slave by combination of master
and slave jumpers.
To configure a drive as the Master (Drive 0), install a jumper on the master pins.
Samsung ships the
WA31083A, Winner 2A WA32162A
jumper installed (Drive 0), and slave Jumper opened.
To specify a drive as the Slave (Drive) remove the master jumper and install the jumper
on the slave pins.
NOTE: The order in which drives are connected in a daisy chain has no significance.
4-
8 WA31273A / WA32543A / WA33203A / WA32163A / WA31083A / WA32162A
Winner 3A WA31273A / WA32543A / WA33203A / WA32163A /
hard disk drives from the factory with the master