What you need

Barracuda 180 Installation Guide

Model ST1181677LW/LC/LWV/LCV, SCSI interface disc drive

Publication Number: 100109942, Rev. A, December 2000

Handling precautions/electrostatic discharge protection

•Some systems provide a cable designed to connect to the J5 jumper block on the drive to remotely set the ID. You can connect this cable to J5 and use the host-provided remote switch to set the SCSI ID.

•Disc drives are fragile. Do not drop or jar the drive and 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 circuit board or drive top.

Electromagnetic compliance

See Safety and Regulatory Agency Specifications, p/n 75789512.

Drive characteristics

Formatted capacity	181.6 Gbytes
Max. data blocks	354,600,001 (1522C441h)
Cylinders and heads (user accessible)	24,247 / 24 heads
Disc rotation	7,200 rpm

Drive

Front

Jumper Plug (enlarged to show detail)

J6							Pin 1
J6
Reserved	L	R	A		A		A A
Reserved	E	E	A	3	A	2	A A
	D	S		3		2	1 0
SCSI ID = 0							(default)

SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

SCSI ID = 8

SCSI ID = 9

SCSI ID = 10

SCSI ID = 11

SCSI ID = 12

SCSI ID = 13

SCSI ID = 14

SCSI ID = 15

			Drive HDA
				Rear
68 Pin		J5
SCSI I/O	+5V	J5		J1
Connector	Pin 1 Ground	Pin 1 DC Power
		4P	3P 2P	1P
J1
SCSI ID = 0			(default)	PCBA
SCSI ID = 1

SCSI ID = 2

SCSI ID = 3

SCSI ID = 4

SCSI ID = 5

SCSI ID = 6

SCSI ID = 7

SCSI ID = 8

SCSI ID = 9

SCSI ID = 10

SCSI ID = 11

SCSI ID = 12

SCSI ID = 13

SCSI ID = 14

SCSI ID = 15

not used A3 A2 A1A0

Operating voltages	+5V	+12V
Typical operating current	0.81A	0.81A

•Phillips screwdriver and four 6-32 UNC drive mounting screws

•Forced-air ventilation to provide adequate drive cooling

•An unused drive power connector (not applicable to LC/LCV models)

To operate at LVD transfer rates, you must use an LVD-capable SCSI host adapter, LVD I/O cable and active negation external terminator

Multimode interface

This drive can operate in single-ended (SE) or low voltage differential (LVD) mode. This multimode capability provides backwards compatibility so you can use it with or without an LVD-capable host adapter. The primary bene- fits of LVD technology include faster transfer rates, reduced power con- sumption, increased allowable cable lengths, and improved device connectivity.

You can configure the drive to switch between SE and LVD modes auto- matically or force it to operate in SE mode only. To configure this option, see Figure 2.

Note. To operate at the Ultra2 rates in LVD mode, all devices on the same bus (cable) must be running in LVD mode. If you add any SE device to the bus, all devices on that bus operate in SE mode.

Note. Some LVD host adapters provide an LVD connector and an SE con- nector on the same host adapter to allow you to run SE and LVD drives concurrently at their maximum capabilities. Check your SCSI host adapter documentation. See Figure 3.

Caution. Do not mix LVD drives on the same bus with high voltage differ- ential (HVD) devices–drive damage may occur.

Installation instructions

1. Set the SCSI ID

Determine which SCSI IDs are already being used in the system and then assign this disc drive a SCSI ID that isn’t already being used. Use the J6 connector located on the front of the drive to set the SCSI ID (see Figure 1).

•Most ST1181677 drives are factory set with the SCSI ID set at 0. If this is the only SCSI drive in your system and there are no other SCSI devices on the daisychain, you can leave this drive’s SCSI ID set to 0 and pro- ceed to the next step.

•The host system’s SCSI controller usually uses SCSI ID 7.

•If you have an LC or LCV model drive, the host normally sets the ID over the I/O interface, so you don’t need to worry about this step.

Figure 1. Setting the SCSI ID

2. Configure termination

If you are installing the drive in a system that has other SCSI devices installed, terminate only the end devices on the SCSI bus (cable). This drive does not have internal terminators or any other way of adding internal termi- nation on the drive. You must provide external termination when termination is required. This is normally done by adding an inline terminator on the end of the cable. See Figure 3 for an illustration showing a system configuration that uses an external terminator.

•Use active (ANSI SCSI-2 Alternative 2) single-ended terminators when terminating a bus operating in single-ended mode.

•Use SPI-2-compliant active low voltage differential terminators when ter- minating a SCSI Ultra2 bus operating in LVD mode.

•The host adapter is normally on the end of the bus and internally termi- nated. You can configure your bus with another device on the end if you remove termination from the host adapter.

3. Configure terminator power

Terminators have to get power from some source. The default configuration results in the drive not supplying termination power to the bus. You should normally leave this drive set at this default unless your host system requires the drive to supply termination power to the bus. To configure this drive to supply termination power to the bus, place a jumper on J2 pins 1 and 2 as shown in Figure 2.

•Host systems designed to use LC and LCV drives normally provide termi- nation power from the host adapter or other source. For this reason, LC and LCV model drives cannot be configured to provide termination power to the bus.