3
4079-001056 Rev. A 5/97 H0310
Figure 9. LED Support Pins
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 are dedicated to LED support, as shown in Figure 12. To install an
external activity LED, connect the positive lead (anode) of the LED to pin
29 and the negative lead (cathode) to pin 10.
NOTE:
These pins can be used to power an LED located on the front of the
drive, or an external LED in systems where the front of the drive cannot be
seen.
Reserved Pins
Several pins on the option block are reserved for development and manu-
facturing purposes:
§
Pins 25 and 26
§
Pin 30
§
Pins 31 and 32
§
Pins 33 and 34
§
Key slot (prevents incorrect installation of connector)
Mode Select Options
You can alter certain configuration parameters using the SCSI Mode Select
command. Some examples include Read/Write Error Recovery Page,
Format Device Page, and Caching Page. The Mode Select command
allows drive characteristics to be customized to meet your system require-
ments. Refer to the Western Digital SCSI Implementation Guide (document
number 4096-001116) for more information.
Remote Option Block
WD Enterprise 68-pin drives are equipped with a remote option block
that allows you to set SCSI IDs and enable select options such as termina-
tion and LED power. Customers using the remote option block typically
use a pre-fabricated cable for convenient connection to the host. Do not
use jumpers on this option block. For more information, refer to the WD
Enterprise Technical Reference Manual (document number 4079-001045).
Multiple Drive Installations
If your system requires multiple devices, you may install up to eight SCSI
devices (including the host bus adapter) on an 8-bit SCSI bus; up to 16
SCSI devices (including the host bus adapter) on a 16-bit SCSI bus, or up
to 32 devices (including the host bus adapter) on a 16-bit SCSI bus with a
dual processor host bus adapter. Refer to the SCSI ID Numbers section on
page 1.
INSTALLING THE DRIVE
Because the Enterprise WDE2170 and WDE4360 drives are compatible
with a wide range of computer systems and host bus adapters, this manual
does not include system-specific information. If the information contained
in the following sections does not apply to your setup, refer to your com-
puter system documentation for further details.
Figure 10. LED Support Pins
Open the Computer
1) Turn OFF the power to the computer system and all attached
peripheral devices.
2) Unplug the AC power cable from the wall outlet.
3) Remove all cables from the back of the computer system.
4) Remove the screws attaching the computer system’s cover using a non-
magnetic screwdriver. Be sure to keep all screws and other parts
together for easy re-assembly.
5) Gently lift the cover and remove it from the chassis.
Prepare the Drive for Installation
NOTE:
Refer to the Western Digital 3.5-Inch Drive Handling Guide (docu-
ment number S0999).
1) Remove the WD Enterprise drive from the anti-static bag, and place the
drive on top of the anti-static bag on your work surface.
2) Configure the drive jumpers as necessary. Refer to “Setting the Drive
Jumpers” on page 1 for more details.
3) If SCSI termination must be provided by the WD Enterprise drive,
ensure that the terminator is properly installed. Refer to SCSI
Termination on page 2.
