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To transfer data at full speed, Ultra ATA/100 hard drives require an 80-conductor cable like that used with ATA/66 drives. The 80-conductor cable has a 40-pin
connector like the ATA/33 cable, but it has twice as many wires within the cable. If you use an ATA/33 cable with Ultra ATA/100 hard drives, the drives will
operate properly, but data will transfer at ATA/33 speeds.
SCSI Device Installation Guidelines
To install a SCSI device, you can use one or both of the following SCSI controllers:
l The SCSI connector on the system board. To locate the SCSI system board connector, see "System Board Components" or the interior service label.
l A SCSI controller card installed in your computer.
SCSI ID Numbers
Internal SCSI devices must have a unique SCSI ID number from 0 to 15. Each SCSI bus will have a set of SCSI ID numbers from 0 to 15.
When SCSI devices are shipped from Dell, 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, refer to 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.
Dell recommends 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, refer to 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 installing a SCSI hard drive, Primary Drive 0 and Primary Drive 1 should be set to None in system setup if no IDE hard drives are installed. If
you have any IDE devices on the second IDE 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. Refer to 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 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 (optional SCSI cards such as 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.
NOTICE: DellrecommendsthatyouuseonlyIDEcablespurchasedfromDell.CablespurchasedelsewherearenotguaranteedtoworkwithDell™
computers.
NOTE: The system board SCSI controller will support hard drives only. Do not connect CD or DVD drives, tape drives, DAT drives, and so on. An add-in
SCSI controller can be installed in your computer for this purpose.
System Board Controller
Optional 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.
NOTICE: Dell recommends that you use only SCSI cables purchased from Dell. Cables purchased elsewhere are not guaranteed to work with Dell
computers.