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Cheetah 15K.3 FC Installation Guide
ST373453FC, ST336753FC and ST318753FC
Publication Number: 100148127, Rev. C, July 2002
Handling precautions/Electrostatic discharge protection
• Disc drives are fragile. Do not drop or jar the drive. Handle the drive only
by the edges or frame.
• 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.
• 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 the circuit board or to the top of
the drive.
Electromagnetic compliance
See the Safety and Regulatory Agency Specifications page, part number
75789512, which was shipped with this installation guide.
Drive characteristics
ST373453FC ST336753FC ST318753FC
Formatted capacity 73.4 Gbytes 36.7 Gbytes 18.4 Gbytes
Total # of data blocks 143,374,744 71,687,372 35,843,686
(88BB998h) (445DCCCh) (222EE66h)
Cylinders (user accessible) 31,310 31,310 31,310
Heads (user accessible) 8 4 2
Disc rotation +/– 5% 15,000 RPM 15,000 RPM 15,000 RPM
Operating voltages +5V +12V +5V +12V +5V +12V
Typical operating
current (amps) 1.05 1.15 1.02 0.97 1.02 0.86
What you need
• 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
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).
Mount the drive to the carrier or tray provided by the host system using four
6-32 UNC screws. Do not over-tighten or force the screws. You can mount
the drive in any orientation. See Figure 1.
Note. FC drives are designed to be attached to the host system without I/O
or power cables.
Figure 1. Sample drive carrier
Note. Figure 1 above shows a generic carrier. Most carriers will look differ-
ent than the one shown. Many are actually small enclosures rather
than brackets as shown here.
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.
Note. There are no jumpers or terminators on the drive, and power is sup-
plied through the 40-pin connector.
3. Connect LEDs (optional)
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.
[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.
[3] Jumper storage location (across pins 2 and 4).
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
• 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)
Drive
Front
Port A Bypass LED [1]
J6
Pin 1
Reserved
Port B Bypass LED [1]
Fault LED [1]
Reserved
Active LED [2]
Reserved
+5V
Active LED [1]
Ground [3]