EIDE Drives

All Caviar drives have a jumper block (J8) located between the 40-pin IDE connector and the power connector. These jumpers select options on the hard drive. The Caviar drive is factory set for a single drive installation. If you are installing the Caviar drive as the only IDE drive in your system, leave the jumper shunt in the neutral storage position. On some Caviar models, you can remove the jumpers completely. In dual drive installations, jumper shunts are needed to designate which drive is master and which is slave. Refer to Figure 1 or Figure 2 for an illustration of all jumper settings.

If you have a dual installation (two IDE drives connected on the same cable), 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. For your other drive, consult its installation guide for master/slave configuration.

To install a jumper shunt on the J8 jumper pins:

• Refer to Figures 1 or 2 to determine your configuration.
• Carefully place the shunt over the pins specified in the figure.
• Push the shunt into place until it is flush against the base of the jumper block.

Note: Designation of a drive as either master or slave is generally determined by jumper configuration, not by the order in which it is daisy-chained to the other drive. The only exception is if the drive is jumpered cable select, and both the system and ribbon cable support cable select. In this case, master and slave is determined by the position on the data ribbon cable. Depending how the system controls the cable select line on the ribbon cable determines where the master and slave need to be attached. Refer to your system manual for more information.

Figure 1. (6 & 10 pin drives)

Figure 2. (9 pin drives)
The pins on the drive may be designated by either letters or numbers.

EIDE Drives Greater than 2.1 GB

This section pertains to the Western Digital drives such as AC32500 and AC33100. The cylinder count of these drives is greater than 4095 cylinders. Some system BIOS's CANNOT properly recognize hard drives that have more than 4095 cylinders.

You will know if your system BIOS has this limitation after installing your drive. On the initial boot your system may a) lock up, or b) show a much smaller drive capacity.

a) If your system locks up (i.e. does not respond after a few minutes), follow these steps:

1. Turn your system power off. Check the IDE interface and power supply cables.
2. Check jumper settings.
3. Turn your system power on.
4. Try to enter your CMOS setup.

If your system still doesn't respond, it may be because you have a system BIOS that doesn't support drives with more than 4095 cylinders. If this is the case, these solutions are available:

1. Use EZ-Drive. If your system locks up before you can enter CMOS, you may need to turn your system power off and disconnect the IDE cable from the system to access your CMOS setup.
   • Enter your CMOS setup. Refer to your system manual for instructions.
   • Select the Hard Disk Type option for the new Western Digital hard drive. Select a user defined drive type and enter: 1023 x 16 x 63.
   • Turn your system off and reconnect your IDE cable to the system.
     These new settings will allow your system to boot so that you can install EZ-Drive to access the full capacity of your drive.

   - OR -

   If you don't have the user defined drive type, use option 2 or 3 below.

2. If you have a 6 or 10-pin drive, re-jumper the drive using the alternate jumper settings as shown in figure 3 and install EZ-Drive. This option changes the parameters reported to the BIOS. If later on you move this drive to another system, you must put the jumper back to the standard position.

   Note: These alternate jumper settings WILL NOT work for Windows NT, OS/2 Warp, Novell NetWare, or UNIX.

   If you have a 9-pin drive, alternate jumper settings can be used, however, this can cause problems. Therefore, we do not recommend using the alternate jumpers on 9-pin drives.

   - OR -

3. Upgrade your BIOS. A properly upgraded BIOS will support the drive. Contact your system manufacturer. See the list of common system and BIOS manufacturers and their phone numbers.

Figure 3. (6 & 10 pin drives)

b) If your drive shows a much smaller capacity than it actually is, install EZ-Drive to overcome the system BIOS limitation.

SCSI Drives

The Enterprise drive is designed for use in a variety of systems. Therefore, several configuration options can be set using the option block on the front of the drive (end opposite the SCSI connector). In most cases, you will not need to change the default settings for normal drive operation, however, some installations may require you to install or remove certain jumpers in order to meet system specifications.

• SCSI ID Jumpers
  NOTE: the jumper label on the top of your SCSI drive refers to the ID pins as SCSI ID0, SCSI ID1, SCSI ID2, and SCSI ID3. This refers to the SCSI ID BIT. Please follow this table for configuring the device ID.
  

  SCSI ID	Pins 7 & 8	Pins 5 & 6	Pins 3 & 4	Pins 1 & 2
  0
  1				X
  2			X
  3			X	X
  4		X
  5		X		X
  6		X	X
  7		X	X	X
  8	X
  9	X			X
  10	X		X
  11	X		X	X
  12	X	X
  13	X	X		X
  14	X	X	X
  15	X	X	X	X
  - applies to 8-bit drives                                X - jumper installed

• Option Pins

  WDE2170/4360

  Pins* Feature X & 10 (Key) / LED- 11 & 12 Reserved or Spindle Sync ** 13 & 14 Disable Auto-Start 15 & 16 Auto-Start Delay 17 & 18 SCAM 19 & 20 Disable Unit Attention 21 & 22 Disable Target Initiated Synchronous/Wide Negotiation 23 & 24 SCSI Termination 25 & 26 Reserved (TXD/RXD) 27 & 28 Termination Power 29 & 30 LED+ / Reserved 31 & 32 Reserved 33 & 34 Reserved

  WDE9100

  Pins* Feature X & 10 (Key) / LED- 11 & 12 11 - Ground / 12 - LED+ 13 & 14 Disable Auto-Start 15 & 16 Auto-Start Delay 17 & 18 SCAM 19 & 20 Disable Unit Attention 21 & 22 Disable Target Initiated Synchronous/Wide Negotiation 23 & 24 SCSI Termination 25 & 26 Reserved (TXD/RXD) 27 & 28 Termination Power 29 & 30 LED+ / Reserved 31 & 32 Reserved 33 & 34 Reserved

  * Jumpering the pins enables the feature.
  ** Spindle Sychronization was removed from later WDE2170/4360 models

• LED Support

If your system configuration allows the use of an activity LED external to the WD Enterprise drive, you can power the LED from the drive. Pins 10 and 29 (and 12 on the WDE9100) are dedicated to LED support. To install an external activity LED, connect the positive lead (anode) of the LED to pin 29 (or pin 12 on the WDE9100) and the negative lead (cathode) to pin 10.

• Reserved Pins

The remaining pins are reserved for development and manufacturing purposes.

• Remote Option Block

  68-pin models have a remote option block that is located between the data and power connectors of the drive. This jumper block is intended for use in systems where the drive is installed into a customized "sled" that plugs into the SCSI bus. The block is used to configure ID and termination and supplies power. Unless the drive is installed in this type of system, the remote option block should not be used.

You can find additional detailed information about the jumper pins on Enterprise SCSI drives in the installation guides and technical reference manuals available from our Adobe Acrobat library.

Jumper Settings - Obsolete Drives

Drive Rails

Some computer systems have 5.25-inch drive bays that require unique sliding drive rails to complete the hard drive installation. Each system manufacturer has a different type of drive rail and for this reason, rails are not included with Western Digital hard drives. If your system requires drive rails, you must contact the computer system manufacturer directly to obtain the rails for your particular system. The following is a list of the most common system manufacturers and their corresponding phone numbers: