Hard Disk Connectors and Jumpers

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Hard Disk Connectors and Jumpers

• Jeffrey Khalil

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Jumpers

• Jumpers configure specifications of Hard Disk
• Jumpers connect HD w/ system
• Number of jumpers and connectors depends on
• A Data interface
• B Manufacturer
• C Special features on the drive
• Note Instructions for setting the jumpers are
  printed on either the HD itself or on the user
  manual.

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Power Connector

• HD uses 4-pin plug from power supply
• Four wire connection
• Keyed
• Supplies 5 and 12 Volts
• Pins are numbered 1-4

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Data Interface Connector

• Modern Hard Disks are either IDE (ATA) or SCSI
• Determine type by looking at the HD interface
• IDE (ATA) has 40 pin connection

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Data Interface Connector cont.

• SCSI has 50, 68, or 80-pin D-shaped connectors
• 50-pin is narrow SCSI
• 68-pin is wide SCSI
• 80-pin is wide SCSI w/ SCA (single connector
  attachment)

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IDE/ATA Configuration Jumpers

• Jumper selections that may be available
• Drive Select (Master or Slave)
• Slave Present- older drives- tells master that
  slave is present
• Cable Select master or slave cable
• Size Restriction large drive looks small.

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SCSI Configuration Jumpers

• SCSI disks are more complex more settings
• SCSI Device ID 3-4 jumpers, which (0-7 or
  0-15)
• Termination Activate disks on ends of the chain
  must be terminated.
• Disable Auto Start dont automatically spin when
  booting
• Delay Auto Start Delay start (Duh)

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SCSI Configuration Jumpers

• Stager Spin High-tech delay auto start (wow)
• Narrow/wide Am I big or small?
• Force SE force newer SCSI disks to use
  single-ended (SE) operation instead of Low
  voltage Differential (LVD)
• Disable Parity

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LED connector

• Light-emitting Diode (LED)
• Indicates Disk activity
• Mounted on the HD itself before Hds were moved
  inside the case
• Mounted on case afterwards w/ wire running to the
  HD
• LED then was attached to HD controller
• Now connected to motherboard
• SCSI has external LED connector

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Hard Disk Logic Board

• Older hard disks were dumb
• Standard hard disks today are smart
• IDE describes all HDs today
• Proper term is AT Attachment (ATA)
• SCSI also has integrated electronics

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Control Circuitry

• Internal Logic board controls
• Spindle motor
• Read/write functions
• Actuator
• Power
• Internal Cache
• Overall performance

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