(SCSI can support multiple devices, SCSI-2 (FastSCSI) can connect up to 7 SCSI devices, and WideSCSI-2 and above can connect 16 SCSI devices. That is to say, all devices only need to occupy one IRQ, and SCSI also supports a wide range of devices, such as CD-ROM, DVD, CDR, hard disk, tape drive, scanner, etc.)