how to modify transfer rate for seagate cheetah ultrascsi

Hi !
I want to modify transfer rate for a seagate cheetah ultrascsi320
hdd.now he operates at 80 MB/sec and i want to modify the transfer rate
for operates at 320MB/sec (lsi logic print a message which tell that the
operating system can do this) How can i do this in linux ?
Thanks !


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