TOPIC
This article describes the relationship of a SCSI disk controller card, the two hard disks connected to it, and the Macintosh system software.
DISCUSSION When two hard drives are connected to a controller card, which is connected to the SCSI bus; then accessing, mounting, and arbitration of the hard disks volumes is handled by the disk controller card and not the SCSI bus. The SCSI address is assigned to the SCSI controller card and sets the priority for the controller card, not the disk drives. So, the system software (Macintosh Operating System) is not addressing the hard drives as SCSI drives but as devices through the SCSI-attached drive controller (the disk drives are talking to the disk controller, not the SCSI bus). SCSI is a transport medium and does not care what is connected to the SCSI controller, provided the SCSI controller follows the rules for placing information on the SCSI bus. In this case, an INIT is required to tell the SCSI controller how to talk to the two separate hard disks. |
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| Document Information | |
| Product Area: | Computers |
| Category: | Cards |
| Sub Category: | Networking Cards |
| Keywords: | |
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