(up to 10 Megatransfers per second, which is 10MB/sec for narrow SCSI or 20MB/sec for wide SCSI) is defined in the SCSI-2 specifications.
When it exchanges data with your Fast SCSI
disk, it will do so at Fast SCSI
A: For a Fast SCSI
device on an Ultra SCSI bus, each device negotiates separately with the controller.
A: Yes, but it will be limited to the Fast SCSI
A: The often quoted Fast SCSI
data rate of 10MB/sec is the maximum data rate.