Acer Altos 600 Acer Altos 600 User's Guide - Page 110

Initiate Wide Negotiation, Enable Disconnection, Send Start Unit Command, SCSISelect Utility

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96 Chapter 5 SCSISelect Utility 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-atime 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

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Chapter 5 SCSISelect Utility
96
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
Y
es
.
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