Acer Altos 600 Series User Manual page 110

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Initiate Wide Negotiation
This option allows communication between all devices (lower 8-bit or upper 8-bit)
on the wide (16-bit) SCSI bus. When set to yes, each device can connect on the
bus. When set to no (disabled), communication can only occur on the lower 8-bits
of the 16-bit SCSI bus. The default setting is yes.
Enable Disconnection
This option determines whether the SCSI controller allows a SCSI device to
disconnect from the SCSI bus (sometimes called Disconnect/Reconnect).
Disconnect/Reconnect allows the SCSI controller to perform other operations on
the SCSI bus while the SCSI device is temporarily disconnected.
When set to yes, the SCSI device may disconnect from the SCSI bus. The SCSI
device, however, may choose not to disconnect, even if permitted by the SCSI
controller (this can usually be configured on the SCSI device). When set to No, the
SCSI device is not allowed to disconnect from the SCSI bus. The default setting is
Yes.
You should leave Enable Disconnection set to yes if two or more SCSI devices are
connected to the SCSI controller. This optimizes SCSI bus performance. If only
one SCSI device is connected to the SCSI controller, set Enable Disconnection to
no to achieve slightly better performance.
Send Start Unit Command
This option, which is supported by some SCSI devices, determines whether the
Start Unit Command (SCSI command 1B) is sent to the SCSI device (most devices
do not require this). Enabling this option reduces the load on your computer's
power supply by allowing the SCSI controller to power-up SCSI devices one-at-a-
time when you boot your computer. Otherwise, the devices all power-up at the
same time. Most devices require you to set a jumper before they can respond to this
command.
When set to yes, the Start Unit Command is sent to the SCSI device during bootup.
When set to no, each SCSI device powers-up in its normal fashion. The default
setting is no.
The Send Start Unit Command setting is valid only if the host adapter BIOS
is enabled.
If this option is enabled for more than one SCSI device, the Start Unit Command is
sent first to the device with the lowest SCSI ID. When this device responds to the
Chapter 5 SCSISelect Utility