Acer Altos 500 aa500ug.pdf - Page 95

Send Start Unit Command, The Send Start Unit Command setting is valid

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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 SCSI controller, the Start Unit Command is sent to the next highest SCSI ID with a setting of yes. The process continues until all supported devices respond to the SCSI controller. If many drives are set to yes for Send Start Unit Command, the boot time varies depending on how long it takes each drive to spin up. Chapter 3 - SCSISelect Configuration Utility 3-15

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Chapter 3 – SCSISelect Configuration Utility
3-15
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
SCSI controller, the Start Unit Command is sent to the next highest SCSI ID with a
setting of
yes
. The process continues until all supported devices respond to the
SCSI controller.
If many drives are set to
yes
for Send Start
Unit Command, the boot time varies
depending on how long it takes each drive to
spin up.