User manual MAXTOR ST39102 INSTALLATION

[. . . ] ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · Cheetah 9LP ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · Disc Drive ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ST39102LW/LC ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ST34502LW/LC ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · Installation Guide ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Electrostatic discharge protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Important safety information and precautions . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Wichtige Sicherheitshinweise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] To change the SCSI ID, refer to the appropriate drive section for your model. If, after completing the installation process, the drive's LED does not show on/off activity when the host is trying to communicate with the drive, a duplicate SCSI ID may be the problem. If this is the case, change the ID so that each device on the SCSI chain has its own unique ID. Also check your system or controller user's manual to ensure that you have not violated its SCSI ID numbering recommendations. 22 Cheetah 9LP Installation Guide, Rev. B Drive termination If you are installing a Cheetah drive in a system that has other SCSI devices installed, terminate only the end devices on the SCSI chain. A SCSI "device" is any disc drive, scanner, tape backup unit, or other piece of hardware connected to your system using the SCSI bus. Use active (ANSI SCSI-2 Alternative 2) single-ended terminators when terminating a bus operating in singleended mode. Use SPI-2-compliant active low voltage differential terminators when terminating a SCSI Ultra2 bus operating in LVD mode. The top example in Figure 2 shows an internal hard disc at one end of the SCSI bus with the SCSI controller at the other end (both are terminated). The bottom example shows two additional SCSI devices connected externally--this means the SCSI controller is no longer on the end of the SCSI chain and should not be terminated. Some controllers prefer to remain terminated even if they are in the middle of the chain. Also, some controllers treat the internal and external chains as separate logical buses. This means you may need to terminate both the first and last devices on both logical buses to achieve proper termination. If necessary, refer to your system or controller documentation to see how this is handled in your particular system. These drives do not have on-board terminators, so you must terminate external to the drive when termination is required. For ST39102LC and ST34502LC drives, this is normally accom- Cheetah 9LP Installation Guide, Rev. B 23 plished by terminating the bus at the backpanel. For ST39102LW and ST34502LW drives, use an in-line terminator on the cable. Internal SCSI cable Internal SCSI device Internal SCSI device Terminate Internal SCSI cable Internal SCSI device Internal SCSI device Controller External SCSI cable Controller External SCSI device External SCSI device Terminate Figure 2. SCSI bus termination Terminator power You usually will not need to change this option and can normally leave the drive configured as it was shipped from the factory. For information about how to change the terminator power option on your drive, refer to the appropriate drive-specific section. I/O circuits and data path widths · These drives can be used in single-ended or low voltage differential interface systems; however, do not attempt to mix these drives on the same daisy chain with high voltage differential devices. The circuits are not compatible and drive damage may occur. · These drives have a "wide" (16-bit) SCSI data bus rather than the standard (non-wide) 8-bit SCSI data bus; however, you can 24 Cheetah 9LP Installation Guide, Rev. B use these wide drives on a standard (non-wide) 8-bit data bus if you provide proper termination to the upper 8-bit data lines. [. . . ] You can also use the J6 jumper block to set the SCSI ID (Figure 16). To change the SCSI ID, install jumpers as shown in the illustration. Drive Front Jumper Plug (enlarged to show detail) Pin 1 J6 SCSI ID = 0 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 (default) Note: [1] Do not remove cover from pins 13 through 20 (darkened area). Figure 16. Setting the SCSI ID on LC drives Cheetah 9LP Installation Guide, Rev. B 47 LC drives Terminating the drive LC model drives do not have internal terminators or any other way of adding internal termination to the drive. [. . . ]