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This routine is used to take the passed request block and determine the exact track and sector for the read or write request and then send the request to the device specified in the request block. Most SCSI devices handle bad track lockouts at the disk level, so driver-level checking is not required.
Syntax:
#include "sys/scsi.h"int xxstart(req_p) REQ_IO *req_p;
The logic is: