User manual MAXTOR HAWK 4 INSTALLATION REV A 10-1994

[. . . ] HAWK 4 Family: . . . . . . . . . . . . . . . . . . . . . . . (Wide Bus) . . . . . . . . . . . . . . . . . . . . . . . Installation Guide . . . . . . . . . . . . . . . . . . . . . . . Contents Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Electromagnetic interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Before you begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Strain relief is recommended at the cable for drives using cables. Do not block system cooling air flow in routing of cables. DC Power connection Model ST15230W/WD family drives receive DC power through a 4 pin connector mounted on the PCB next to the SCSI I/O connector. See Figure 1. 18 Hawk 4 (Wide) Family Install Guide, Rev. A ___________________________________________ J1 J1-Auxiliary 68 Pin SCSI I/O Connector 4P 3P 2P 1P DC Power Connector Pin 1P 2P 3P 4P Power +12V +12V ret + 5V ret + 5V Figure 1. DC power connection, 68 pin SCSI I/O connector ST15230WC and ST15230DC model drives receive power from the host computer through the 80 pin combined SCSI I/O and power connector (not shown, since a separate DC power cable not required). No separate DC power connector is provided on the drive. SCSI address selection On "W" and "WD" model drives, make sure that the SCSI bus address jumper plugs are properly set for the bus address assigned to the drive. In some systems, a cable plugs into either J6 or J1auxiliary, so drive ID can be set at some remote location. See Figures 3a and 3b showing the bus address select header and the jumper configurations that select addresses 0 through 15. ID 7 has the highest priority during bus arbitration on (both 8 and 16 device systems). Bus arbitration priority decreases to ID 0, then ID 15 down to ID 8. Typically the primary boot device is set to ID 0 the host is ID 7, and the subsequent SCSI drives are jumpered as appropriate for the particular system involved. Hawk 4 (Wide) Family Install Guide, Rev. A 19 ___________________________________________ If the drive LED shows no on/off activity when the host is trying to communicate with it, an incorrect bus address selection at the drive (or remote ID select location) should be suspected. On "WC and DC" model drives the SCSI ID can be and presumably will be, set over the 80 pin interface by the host computer. Unless directed to do so by the system documentation, no jumpers should be installed for address selection. On "WC and DC" model drives, the host system also has complete control over motor start functions, so no Motor Start or Delayed Motor Start Jumpers should be installed. Terminator resistor packs Model ST15230W family drives have I/O line terminator resistors that are permanently installed, but can be enabled or disabled by jumper plug. If you are installing a single drive, the terminator resistors must remain enabled. If you are installing multiple hard disc drives, disable the termination resistors from all the drives but the one connected to the end of the SCSI I/O cable. 20 Hawk 4 (Wide) Family Install Guide, Rev. A ___________________________________________ Model numbers that end in "WD and DC" have differential I/O circuits and these drives and "WC" model drives have no provisions for terminators on the drive PCB. The system manufacturer must provide some external means of I/O line termination. [. . . ] Screw tightening torque 6. 0 in-lb (. 675 NM) max with minimum thread engagement of . 12 in. [2] Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0. 20 in. Screw tightening torque 6. 0 in-lb (. 675 NM) max with minimum thread engagement of . 12 in. [. . . ]