Note. Figure 1 shows a generic carrier. Most carriers will look different than
the one shown. Many are actually small enclosures rather than
brackets as shown here.
Cheetah 73LP FC Installation Guide
Models ST373405FC/FCV and ST336605FC/FCV
Fibre Channel interface disc drive
2. Insert the drive
Slide the carrier or tray into the appropriate bay in your host system. This
connects the drive directly to your system’s 40-pin Fibre Channel single
connector attachment (FC-SCA). The FC-SCA connector is normally
located on a Fibre Channel backpanel.
Publication Number: 100109947, Rev. A, April 2001
Handling precautions/Electrostatic discharge protection
Note. There are no jumpers or terminators on the drive, and power is sup-
• Disc drives are fragile. Do not drop or jar the drive and handle the drive
only by the edges or frame.
plied through the 40-pin connector.
3. Connect LEDs (optional)
• Drive electronics are extremely sensitive to static electricity. Keep the
drive in its antistatic container until you are ready to install it. Wear a wrist
strap and cable connected to ground. Discharge static from all items near
or that will contact the drive. Never use an ohmmeter on any circuit
boards.
Note. This is an optional step. The drive will work fine without the LEDs
connected to the drive.
The drive supplies pins that you can use to connect fault and active LEDs.
This allows you to monitor drive fault conditions and activity. The actual LED
is external to the drive.
• Turn off the power to the host system during installation.
• Always use forced-air ventilation when operating the drive.
• Use caution when troubleshooting a unit that has voltages present.
• Do not disassemble the drive; doing so voids the warranty.
• Return the entire drive for depot service if any part is defective.
• Do not apply pressure or attach labels to circuit board or drive top.
Drive
Front
Electromagnetic compliance
See Safety and Regulatory Agency Specifications, p/n 75789512.
Drive characteristics
ST373405
ST336605
Formatted capacity
Max. data blocks
73.4 Gbytes
36.7 Gbytes
Pin 1
J6
143,374,741
(088BB995h)
71,687,371
(0445DCCBh)
Reserved
Cylinders and heads (user accessible) 29,549/8 heads
29,549/4 heads
10,041 rpm
Port A Bypass LED [1]
Port B Bypass LED [1]
Fault LED [1]
Reserved
Disc rotation
10,041 rpm
Operating voltages
+5V
+12V
+5V
+12V
Typical operating current
0.88A 0.87A
0.88A 0.81A
What you need
Active LED [2]
+5V
• Phillips screwdriver and four 6-32 UNC drive mounting screws
• Forced-air ventilation to provide adequate drive cooling
• Host system with Fibre Channel host adapter or backplane
Active LED [1]
Ground [3]
[1] The drive has a 2.2K ohm resistor in series with this LED driver. Tie the
minus side of an external high-efficiency LED (i.e., 2ma) to this pin.
Connect the plus side of the LED to +5V.
[2] An external current-limiting resistor is required when connecting an
LED to this pin. The minus side of the resistor/LED combination is con-
nected to this pin. Connect the plus side to +5V.
Installation instructions
1. Mount the drive in the host system carrier or tray
Most Fibre Channel host systems (including enclosures) provide a way to
insert the drive using a carrier or tray which allows the drive to be hot-
plugged into the system’s Fibre Channel 40-pin single connector attach-
ment (FC-SCA).
[3] Jumper storage location (across pins 2 and 4).
Mount the drive to the carrier or tray provided by the host system using four
6-32 UNC screws. Two mounting holes are in each side of the drive and
there are four mounting holes in the bottom of the drive. Do not over-tighten
or force the screws. You can mount the drive in any orientation. See Figure
Figure 2.
LED indicator connector
Fault LED Signal
The drive activates the fault LED Out signal when:
• the drive detects failure of both ports
• the drive detects an internal failure
Note. FC and FCV drives are designed to be attached to the host system
without I/O or power cables.
• the drive receives the appropriate fault LED command from the host
Active LED signal
The drive activates the active LED signal as indicated below.
Normal command activity
LED status
Spun down and no activity ............. Slow blink (20% on and 80% off)
Spun down and activity .................. On
(command executing)
Spun up and no activity.................. On
Spun up and activity....................... Off
(command executing)
Spinning up or down....................... Blinks steadily (50% on and 50% off)
Format in progress ......................... Toggles on/off
(each cylinder change)
Figure 1.
Sample drive carrier
