The device uses a connection that fits into the computer's parallel port. Most printers use this type of connection. It can be found on Backups, CD writers and other devices as well. All parallel devices are external. These products come in colorful packaging that usually have pictures and product descriptions on the box.
Many boxed products are eligible for mail-in rebates and come with extra software.
The device uses a connection that fits into a SCSI controller card. SCSI controller cards are not included in most systems, but can be bought as an add-on. SCSI devices generally have higher transfer rates and faster access times than IDE or Parallel devices. Some hard disks and CD drives use this type of connection. It can be found on Backups, CD writers and other devices as well.