Adaptec SCSI Card 39160 User’s Reference
SCSI Device Configuration Options
SCSI Device Configuration options can be set individually for each connected SCSI device.
Note: To configure settings for a SCSI device, you must know its SCSI ID (see Using SCSI Disk Utilities on page 24).
■Sync Transfer Rate—(Default: 160) Determines the maximum synchronous data transfer rate that the SCSI card supports. We recommend that you leave the maximum (default) value of 160 MBytes/sec.
■Initiate Wide Negotiation—(Default: Yes) When set to Yes, the SCSI card attempts 16-bit data transfer (wide negotiation). When set to No, the SCSI card uses 8-bit data transfer unless the SCSI device requests wide negotiation.
Note: Set Initiate Wide Negotiation to No if you are using an 8-bit SCSI device that hangs or exhibits other performance problems with 16-bit data transfer rate enabled.
■Enable Disconnection—(Default: Yes) When set to Yes, allows the SCSI device to disconnect from the SCSI bus. Leave the set- ting at Yes if two or more SCSI devices are connected to the SCSI card. If only one SCSI device is connected, changing the setting to No results in slightly better performance.
■Send Start Unit Command—(Default: Yes) When set to Yes, sends the Start Unit Command to the SCSI device at bootup.
The following three options have no effect if the SCSI Card BIOS is disabled. (The SCSI Card BIOS is normally enabled by default.)
■Enable Write Back Cache—(Default: N/C) Can be used to enable or disable the write-back cache on SCSI disk drives con- nected to the host adapter. Leave this option at its default setting of N/C (no change), which usually allows for optimum drive performance.
