make the drive spin and be ready for media access operations. When in Auto-Start Delay mode,
the drive will delay its start time by a period of time multiplied by its SCSI address.
External Activity (LED) Pins
The LED pins can be used to drive an external Light Emitting Diode.
Write Protect Pin
If the Write Protect pin is jumpered to ground the drive will prohibit SCSI commands that alter the
customer data area portion of the media from being performed.
Disable Synchronous Negotiation Pin
If a Disable Target Initiated Synchronous Negotiation pin is grounded then a host initiator is
required to start a negotiation handshake if wide transfers (16 bit) are desired.
Disable SCSI Partiy Pin
Grounding this pin will disable SCSI partity checking.
Disable Unit Attention Pin
Grounding this pin will disable the drive from sending Unit Attention Sense information for
commands immediately following a Power On Reset or SCSI Bus Reset.
Disable Wide Negotiations
Jumpering the pins will cause the drive to operate in single byte mode. The drive will not
negotiate wide operation.
Force Single Ended Mode
Jumpering pin 23 to pin 24 will cause the 68 pin and 80 pin SCA LVD drives to operate in single
ended mode only. The drive will not use the DIFFSENS line to determine SE or LVD modes
Controller information
The examples in this guide have used an Adaptec controller. You may have a chipset embedded into
your motherboard. If this is the case, plug the cable into the port on the motherboard instead of the
controller.
If you are purchasing an add-on controller card, you will need to install the controller in one of the empty
slots in your computer. Remove the screw holding the metal plate in place and insert the controller into
the PCI, EISA or ISA slot on the motherboard, making sure the metal plate from the controller fits into the
grooves on the computer frame. Replace the screw and connect the SCSI cables to the controller and
then the hard drive. If you have any questions, refer to the installation manual enclosed with your
controller.
Backup and restore
One of the most common methods of backup is tape backup. Tape drives are available from IBM and
other major manufacturers. This method is preferred for overnight backups that run while your business
is closed or while you sleep.
Another method of backup is the removable drive. There are several brands of removable drives.
IOMEGA is one of the better-known manufacturers. IOMEGA manufactures the popular ZIP drive and
the JAZ drive. These drives can be used for backup and hooked up or removed with little trouble.
IBM storage products
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IBM Hard Disk Drive Technical Support Center version 1.0