Dell Precision 650 - Manual (Page 51)

installed in your computer, you have two separate SCSI buses operating. Each SCSI bus has a set of SCSI ID numbers from 0 to 15.
When SCSI devices are shipped from the factory, the default SCSI ID numbers are assigned as follows:
SCSI devices installed by Dell are configured correctly during the manufacturing process. You do not need to set the SCSI ID for these SCSI devices.
If you attach additional optional SCSI devices, see the documentation for each device for information about setting the appropriate SCSI ID number.
Device Termination
SCSI logic requires that termination be enabled for the two devices at opposite ends of the SCSI chain and disabled for all devices in between.
It is recommended that you use terminated cables and that you disable termination on all devices. See the documentation provided with any optional SCSI
device you purchase for information on disabling termination on the device.
General Guidelines
Follow these general guidelines when installing SCSI devices in your computer:
l Although you install SCSI devices essentially the same way as other devices, their configuration requirements are different. For details on configuring
your particular SCSI subsystem, see the documentation for your SCSI devices and/or your host adapter card.
l Configure the device for a SCSI ID number and disable termination, if necessary.
l To use an external SCSI device, you must have a SCSI controller card installed in your computer. Connect one end of the external SCSI cable to the
connector on the back of the SCSI device. Attach the other end of the external SCSI cable to the connector on the controller card installed in the
computer.
l After you install a SCSI hard drive, Primary Drive 0 and Primary Drive 1 should be set to None in system setup if no EIDE hard drives are installed. If
you have any EIDE devices on the second EIDE channel, such as a CD or tape drive, Secondary Drive 0 and/or Secondary Drive 1 should be set to
Auto.
l You may need to use programs other than those provided with the operating system to partition and format SCSI hard drives. See the documentation
that came with your SCSI software drivers for information on installing the appropriate drivers and preparing your SCSI hard drive for use.
SCSI Cables
Ultra 320 (optional on the Dell Precision 450 computer), Ultra 160/m and Ultra2/Wide LVD drives (typically hard drives) both use a 68-pin cable. One end of the
cable attaches to the SCSI connector on the system board or the SCSI controller card installed in your computer. The remaining connectors on the cable attach
to the various drives.
Narrow SCSI drives (tape drives, CD drives, and some hard drives) use a 50-pin cable. One end of this cable attaches to the SCSI controller card. The
remaining connectors on the cable attach to the various Narrow SCSI devices.
Hard Drive
1. If you are replacing a hard drive that contains data you want to keep, back up your files before you begin this procedure.
2. Shut down the computer through the Start menu.
3. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.
System Board Controller Controller Card
Device ID Device ID
Controller 7 Controller 7
Boot hard drive 0 Boot hard drive 0
CD or DVD drive 5
tape or DAT drive 6
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the cable in order by ID number. If two or
more devices use the same ID, your computer may hang during POST and in SCSI BIOS.
NOTICE: Dell recommends that you use only SCSI cables purchased from Dell. Cables purchased elsewhere are not guaranteed to work with Dell
computers.
NOTICE: Dell recommends that you use only SCSI cables purchased from Dell. Cables purchased elsewhere are not guaranteed to work with Dell
computers.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will sufficiently
cushion it.