No, there's no need for other SCSI gearings in your PC.
But you need a SCSI card controller in your PC for your burner.
However a cheap card NCR) or a simple Adaptec(2904), with transferrate of 10Mb/sec will do the job. Price average $50
When you intend to use a fast SCSI HD the neccesary SCSI card for that purpose cost's a lot more.