Hitachi 18lzx Installation Instruction
Step 3: Setting the jumpers
The installation of your drive may require the placement of certain jumpers on the jumper block. Jumpers
are small electrical conductors covered with plastic and are used to connect pairs of pins on a jumper
block. Each jumper enables a particular function in the drive. The jumpers are located on the opposite
end of the interface connector (see diagrams below). All pins have a pin pitch of 2mm, with the exception
of Termination Power pins. Jumpers can be purchased at any local computer store.
are small electrical conductors covered with plastic and are used to connect pairs of pins on a jumper
block. Each jumper enables a particular function in the drive. The jumpers are located on the opposite
end of the interface connector (see diagrams below). All pins have a pin pitch of 2mm, with the exception
of Termination Power pins. Jumpers can be purchased at any local computer store.
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Set the following jumpers as needed:
Termination Power jumper (68 pin drives only)
Place a jumper on External Termination Power if your host adapter or another device does not supply
termination power. These pins require a 2.54mm jumper.
Place a jumper on External Termination Power if your host adapter or another device does not supply
termination power. These pins require a 2.54mm jumper.
SCSI ID - pins 1 through 8
Assign a unique SCSI ID to your drive and place the jumper(s) accordingly. You can use ID 0
through ID 15; ID 7 is generally reserved for the controller card. The diagram below gives the jumper
positions for each ID.
Assign a unique SCSI ID to your drive and place the jumper(s) accordingly. You can use ID 0
through ID 15; ID 7 is generally reserved for the controller card. The diagram below gives the jumper
positions for each ID.
Auto Start and Auto Start Delay - pins 11 & 12, 21 & 22
The Auto Start and Auto Start Delay pins control when and how the drive can spin up and come
ready. With Auto Start enabled, the motor spins up after power is applied without the need for a
SCSI Start Unit command. With Auto Start disabled, a SCSI Start Unit command is required to make
the drive spin and be ready for media access operations. With Auto Start Delay mode enabled, drive
spin up is delayed by a period of time determined by the Auto Start jumper multiplied by the drive's
SCSI address.
The Auto Start and Auto Start Delay pins control when and how the drive can spin up and come
ready. With Auto Start enabled, the motor spins up after power is applied without the need for a
SCSI Start Unit command. With Auto Start disabled, a SCSI Start Unit command is required to make
the drive spin and be ready for media access operations. With Auto Start Delay mode enabled, drive
spin up is delayed by a period of time determined by the Auto Start jumper multiplied by the drive's
SCSI address.
External Activity (LED) - pins 17 & 18
The LED pins can be used to drive an external Light Emitting Diode. Up to 33mA (5%) of TTL level
LED drive current is provided. The LED
The LED pins can be used to drive an external Light Emitting Diode. Up to 33mA (5%) of TTL level
LED drive current is provided. The LED
Anode may be tied to the +5V source provided on pin 18 of
the front option jumper block, pin 11 of the Auxiliary connector on the 68 pin unitized connector, or
the 5V power source on the 80 pin SCA model. The LED Cathode is then connected to the External
the 5V power source on the 80 pin SCA model. The LED Cathode is then connected to the External
IBM storage products
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IBM Hard Disk Drive Technical Support Center version 2.0
34L3743IG10
34L3743IG10