Seagate ST3300457FC Cheetah 15K.5 SCSI Product Manual - Page 46
Alternate, Usage Plug
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Drive HDA (rear view, PCB facing downward) Pin 1 +5V Ground J5 Pin 1 [1] [2] 4P 3P 2P 1P [2] J1-DC Power 68 Pin SCSI I/O Connector J1 SCSI ID = 0 SCSI ID = 1 SCSI ID = 2 (default) PCB SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6 SCSI ID = 7 SCSI ID = 8 SCSI ID = 9 For ID selection use jumpers as shown or connect a cable for remote switching as shown below. SCSI ID = 10 SCSI ID = 11 SCSI ID = 12 SCSI ID = 13 SCSI ID = 14 SCSI ID = 15 Reserved A3 A2 A1A0 Host Alternate N.C. Usage Plug 11 9 7 5 3 1 [4] A0 A1 A2 A3 +5V 12 10 8 6 4 2 +5V N.C. Ground Drive Activity LED [4] Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage plug. Pins 1, 3, 5, and 7 are optional connections to switching circuits in host equipment to establish drive ID. Remote Switches Pins 2, 4, 6, and 8 are normally not grounded. They are driven low (ground) for 250 ms after a Reset or PWR ON to allow drive to read SCSI ID selected. Figure 10. J5 jumper header (on LW models only) 40 Cheetah 15K.5 SCSI Product Manual, Rev. J