Adaptec AHA-2740W User Manual page 71

Caution:
If a removable media SCSI device is controlled by
the host adapter BIOS, do not remove the media while the
system is powered-on or data loss could occur! The host
adapter BIOS does not support removability while the system
is turned on. If removability is desired while the system is
powered-on, the removable media device should be
installed with device drivers and not the host adapter BIOS.
Error if Device Not Found
This option determines whether or not the host adapter BIOS
generates an error message when the BIOS is unable to find the
device during bootup.
When set to yes, the BIOS checks the SCSI ID for a SCSI device; if
none is found, an error message is displayed during bootup similar
to the following:
Channel A, Target #1 – Device Not Found
When set to no, the BIOS does not attempt to display an error mes-
sage if the SCSI device is not found. The default setting is no.
Send Start Unit Command
This option, which is supported by some SCSI devices, determines
whether or not the SCSI Start Unit Command (SCSI command 1B)
is sent to the SCSI device (most devices do not require this). The
Start Unit Command reduces the load on your computer's power
supply by allowing the host adapter to powerup SCSI devices
one-at-a-time when you boot your system. Otherwise, the devices
will all powerup at the same time. Most drives usually require that a
jumper on the drive be set to respond to this command.
When set to yes, the SCSI Start Unit Command is sent to the SCSI
device during bootup. When set to no, the SCSI device will powerup
in its normal fashion. The default setting is no.
If this option is selected for more than one SCSI device, the SCSI
device with the lowest SCSI ID will be sent the SCSI Start Unit Com-
mand first. When the first device is ready and responds to the host
adapter, the next highest SCSI ID with a setting of yes is sent the
SCSI Start Unit Command. This process continues until all sup-
ported devices respond to the host adapter.
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AHA-2740W/2742W/2744W User's Guide
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Current Date: 8/3/94
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Configuring the Host Adapter
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ECN Date: 8/9/94
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