Reserved Pins; Mode Select Options; Remote Option Block - Western Digital WD Series Installation Manual

Reserved Pins

There are a number of pins on the option block that are
reserved for development and manufacturing 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

Certain configuration parameters can be altered by 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
requirements. 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 termination, spindle
synchronization, 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).
Released 10/18/96