Western Digital  (250-0100/1/2/3/4)  Jumper Settings   Faxback Doc. # 2908
Hard Disk Upgrade Kits

Be sure you have determined your installation requirements, configuration,
and materials before proceeding.

The Caviar drive has a jumper block (J8) located next to the 40-pin 
connector on the drive.  The Caviar drive is factory set for single drive 
installation.  If you are installing the Caviar drive as the only IDE drive
in your system, you do not need to install any jumper shunts.  In dual 
drive installations, jumper shunts are needed to designate which drive is 
master and which is slave.

If you have a dual installation (two IDE drives), you must designate one
of the drives as the master and the other as the slave.  The jumper pins
on block J8 need to be configured for dual installation.  To designate the
Caviar drive as the master, place a jumper shunt on pins 5-6.  To
designate the Caviar drive as the slave, place a jumper shunt on pins 3-4.

Single Drive-(J8)-No Jumpers or 3 & 5 Jumped

Dual Master-(J8)-5 & 6 Jumped

Dual Slave-(J8)-3 & 4 Jumped

NOTES: Designation of a drive as either master or slave is determined by 
       jumper configuration, not by the order in which it is daisy-chained
       to the other drive.

       As of July 1994 Western Digital is adding a jumper shunt on all
       3.5" Caviar drives. With the jumper now added to the drive, you can
       configure your drive as either a single, master or slave, without 
       having to purchase an extra jumper shunt.  The jumper is installed
       on the J8 jumper block across pins 3 and 5 which is a neutral 
       storage position.

(SMC/jlc-08/08/94)