User manual MAXTOR ST32272N INSTALLATION

[. . . ] · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· Barracuda 4XL · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· Disc Drive · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· ST34572N/W/WD/WC/DC · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· ST32272N/W/WD/WC/DC · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· Installation Guide · ·· · · ·· · · ·· · · ·· · ·· · · ·· · · ·· Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Electrostatic discharge protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Important safety information and precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Wichtige Sicherheitshinweise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] If the system into which you are installing this drive requires SCAM compliant drives, you do not need to be concerned about the drive ID jumper settings, as the system automatically assigns your new drive the ID it wants it to have. Setting the drive ID doesn't hurt anything, but is not necessary in a SCAM compliant system. 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. B 21 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. Drive termination If you are installing a Barracuda 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. 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. 22 Barracuda 4XL Installation Guide, Rev. B For information about how to terminate your drive, refer to the appropriate drive-specific section. 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 · "WD" and "DC" models use differential I/O circuits. You cannot mix these models with single-ended models ("N, " "W, " "WC") on the same SCSI bus. · "W, " "WD, " and "WC" models have a "wide" (16-bit) SCSI data bus rather than the standard (non-wide) 8-bit SCSI data bus; however, you can use these wide drives on a standard (non- Barracuda 4XL Installation Guide, Rev. B 23 wide) 8-bit data bus using a terminated 68-pin to 50-pin SCSI cable. The following table lists the maximum cable lengths and number of devices with single-ended I/O circuits allowed on a daisy-chain cable for <10 and <20 M transfers/sec I/O data transfer rates. Cable characteristics for single-ended circuits Maximum number of devices on line Maximum cable length allowed I/O transfer rate <10 M transfers/s 8 (reg. SCSI bus) <10 M transfers/s 16 (wide SCSI bus) 6 meters (19. 7 ft. ) 6 meters (19. 7 ft. ) <20 M transfers/s 4 (reg. /wide SCSI bus) 3 meters (9. 8 ft. ) <20 M transfers/s 8 (reg. /wide SCSI bus) 1. 5 meters (4. 9 ft. ) For devices having differential I/O circuits, a maximum cable length of 25 meters (82 feet) is allowed. A maximum of 8 devices can be connected on an 8-bit wide data bus, and a maximum of 16 devices can be connected on a 16-bit wide data bus. 24 Barracuda 4XL Installation Guide, Rev. [. . . ] If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 15 and 16 of connector J2 (see Figure 13). Use active (ANSI SCSI-2 Alternative 2) terminators when terminating the bus. "WD" model drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide external differential termination to these drives when termination is required. Pin 1 J2 R T D MW P E T T ESEPDSPP *Enable SCSI terminator *Disable SCSI terminator *"W" model only J2 J6 Drive Front J2 Jumper Type (enlarged to show detail) DC Power Connector (default) SCSI I/O J1 Connector Figure 13. [. . . ]