This is because many PCs and disks use the
Cable Select method of choosing the disk??™s role. With Cable Select, the cable
connection used to connect the disk determines the drive??™s role.
If your PC doesn??™t use Cable Select, you need to check that the disk is set to
the correct role, master (primary) or slave (secondary). To change the configuration,
you use a jumper (a small connector) to connect two pins. This illustration
shows the back of a disk drive with a jumper in place connecting two pins:
Jumper
Drive cable connector
Configuration pins
Power connector
Normally,
you??™ll
find
on
the
disk??™s
label
a
small
and
confusing
diagram
indicating
which
jumper
configuration
means
what.
Sometimes,
you??™ll
need
to consult the disk??™s documentation or the manufacturer
??™s website to find that
small and confusing diagram.
When
you??™re adding
a
disk, check the existing disk??™s configuration to
determine
how to configure the new disk. For example, if you??™re adding a second
disk on the same cable, and you find the existing disk is configured as a master,
configure the second disk as a slave.
When
you??™re
replacing
a
disk,
the
best
approach
is
normally
to
set
the
same type of jumper configuration on
the new disk as on the old disk,
and to
connect the new disk to the same connector on the same cable. For example, if
the
old disk
is
jumpered
to
the
Cable Select position,
jumper
the new disk to
Cable Select, and use the same connector on the same drive cable.
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