Acer Altos 9100 Series User Manual page 84

Data is transferred in asynchronous mode if neither the SCSI controller nor the
SCSI peripheral negotiates for synchronous data transfers.
Maximum Sync Transfer Rate
This option determines the maximum synchronous data transfer rate that the SCSI
controller can support. The SCSI controller supports rates up to the UltraWide
SCSI maximum of 40.0 MBytes/sec. The default value is 40.0.
In most cases, you can use the maximum value of 40.0. If the SCSI controller is set
not to negotiate for synchronous data transfer (i.e., Initiate Sync Negotiation is set
to no), then the value selected here is the maximum rate that the SCSI controller
accepts from the device during negotiation. (This is standard SCSI protocol.)
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.
AcerAltos 9100 Series User's Guide
4-12
Some older SCSI-1 devices do not support
synchronous negotiation. This may cause your
computer to operate erratically or hang if Initiate
Sync Negotiation is enabled. Set Initiate Sync
Negotiation to no for these devices.
Some older SCSI-1 devices do not support Fast
SCSI data transfer rates. This may cause your
computer to operate erratically or hang if the
transfer rate is set too high. Set Initiate Sync
Negotiation to no for these devices.