Acer Altos 9100B User Manual page 141

Initiate Sync Negotiation
This option determines whether the SCSI controller initiates synchronous
negotiation with the SCSI device.
When set to yes, the SCSI controller initiates synchronous negotiation with the
SCSI device. When set to no, the SCSI controller does not initiate synchronous
negotiation. The SCSI controller, however, always responds to synchronous
negotiation if the SCSI device initiates it. The default setting is yes.
Data is transferred in asynchronous mode if neither the SCSI controller nor the
SCSI peripheral negotiates for synchronous data transfers.
AcerAltos 9100B Series User's Guide
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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.