User's Manual

Basics Data Buses - 16
Devices are designated as master or slave using jumpers,
small connectors that fit over pairs of pins to program the
drive through hardware. Each hard drive manufacturer uses
a different combination of jumpers (usually named
differently) for specifying whether its drive is master or
slave on the channel. Some disks put this information right
on the top label of the drive itself, while many do not; it
sometimes takes some hunting around to find where the
jumper pins are on the drive even once you know how the
jumpers are supposed to go.
ATAPI drives, or ATA/IDE devices that support removable
media like CD-ROM's are jumpered in exactly the same way,
and they have the advantage of having their jumpers much
more universally labeled than their hard disk counterparts.
If you are using two drives on a channel, it is important to
ensure that they are jumpered correctly. Making both