Speed only depends on how fast the internal SCSI bus and HD are since the CPU doesn't need to be bothered with SCSI transfers unlike with old IDE.
You should be able to do 1MB+ on most 68020+ systems, 8x cdr is 1.2MB/sec I think (150Kb/sec per X).
You should be able to do 1MB+ on most 68020+ systems, 8x cdr is 1.2MB/sec I think (150Kb/sec per X).