Western Digital  (250-0105/6)  Jumper Settings         Faxback Doc. # 15669
Hard Disk Upgrade Kits

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

A jumper is required if you are installing the Westerm Digital hard drive 
with an existing drive.  For dual drive installations, jumper shunts are 
needed to designate which drive is master (C:) and which is slave (D:).  We
recommend using the Western Digital hard drive as the master.

The Western Digital drive has a jumper block (J8) located next to the 
40-pin connector on the drive.  The Western Digital drive is factory set 
for single drive installation.  If you are installing the Western Digital 
drive as the only IDE drive in your system, you do not need to install any
jumper shunts.  

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
Western Digital drive as the master, place a jumper shunt on pins 5-6.  To
designate the Western Digital 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

Jumper Block:
                     5     3     1
                   ┌────────────────┐
                   │┌──┐  ┌──┐  ┌──┐│
                   │└──┘  └──┘  └──┘│
                   │                │
                   │┌──┐  ┌──┐  ┌──┐│
                   │└──┘  └──┘  └──┘│
                   └────────────────┘
                     6     4     2

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"
       Western Digital 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/tmc-06/13/95)