The SCSI processor handles all those housekeeping detail, and this is also true of FireWire.īack in the era of 8 MHz computers (the speed of the four earliest Macs and a couple later ones), a smart interface like SCSI made a world of difference. With SCSI, the drive has its own processor, so the operating system only has to ask it for data, not know where it is stored. With “dumb” interfaces, the computer’s operating system has to know the physical location of information on the hard drive – which sector of which track of which side of which platter to access to launch an application or read a data file. That’s because SCSI is an intelligent interface that hides the physical details of the hard drive from the computer.
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