Seagate ST136475LW/LC manual

Barracuda 36 Installation Guide, Rev. B

ground (see Figure 12). The host device cannot override the SE jumper. If “DIFFSNS” is at nominal ground (0V to .6V), all of the bus receivers/drivers operate in single-ended mode. If “DIFFSNS” is between .7V and 1.9V, all bus receiver/drivers operate in low voltage differential (LVD) mode.

•“LC” and “LW” models have a “wide” (16-bit) SCSI data bus rather than the standard (non-wide) 8-bit SCSI data bus; how- ever, you can use these wide drives on a standard (non-wide) 8-bit data bus. However, the unused lines must be terminated the same as the used lines.

Figures 3a and 3b show typical drive connections. The following tables list the maximum cable lengths and number of devices allowed on a daisy-chain cable for I/O data transfer rates shown.

Note. For LVD operation, twisted pair cables are recom- mended. For LVD Fast-40 operation, twisted pair cables are strongly recommended. For Fast-80 operation, twisted pair cables are required.