Intergraph TD-x20 System Reference Manual page 43

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You can install a replacement or a second SCSI hard disk drive into the system hard
disk drive bracket between the riser card and power supply. If the hard disk drive is
more than 1 inch high, you will not be able to install a second hard disk drive into the
system hard disk drive bracket, nor will you be able to use ISA slot 1. If you install a
second hard disk drive in the system hard disk drive bracket, you will not be able to use
ISA slot 1. If you install a non-Ultra SCSI device, data transfer rates are limited to the
device's speed.
Deskside systems are equipped with an Ultra Wide SCSI controller for internal SCSI
devices. The internal device bays are located above the floppy disk drive bay. You can
install internal Ultra Wide SCSI devices, or devices controlled from an expansion card, in
the device bays. The device bays are designed to accommodate 1.6-inch high devices; if a
device is more than one 1.6-inch high, the bay underneath must be left empty. If you install
a non-Ultra Wide SCSI device, data transfer rates are limited to the device's speed.
CAUTION Connecting a non-compliant SCSI-1 device to a TD-x20, TD-x25, TDZ-x20, or TDZ-x25
workstation may cause your system to stop working, or lead to other unpredictable results.
To install an internal SCSI device:
NOTE Refer to Chapter 2, "Maintaining System Devices," for information about removing and
replacing devices in the system, and for information on installing a device in the optional
device bay on the desktop system.
1. If a device already occupies the location in which you are adding the new device, remove
the existing device. If installing the device into an empty drive bay, remove the support
or slide bracket from the drive bay.
2. Mount the device to the support or slide bracket, if necessary.
3. If you are installing the device into one of the forward device bays in a desktop system,
slide the device through the faceplate and secure it to the chassis.
4. If installing hard disk drives into the system hard disk drive bracket in a desktop system,
replace the bracket, ensuring the bracket tabs engage the slots on the peripheral brace.
NOTE ISA Slot 1 can be used only if a single system hard disk drive is installed, and if it is less than
1.6-inches in height.
5. Connect the SCSI cable and power cable to the device. The SCSI cable is keyed to
ensure proper insertion, so that the red stripe (pin 1) is adjacent to the power connector.
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