Adding an SCSI hard disk drive to a computer or laptop gives it a boost. For example, an Ultra 320 interface with an 8 MB buffer and 63 GB capacity will increase the performance of the computer.
Don't forget about the speed when choosing a SCSI hard disk drive. Typical RPM speeds are 10,000 or 15,000. Faster speeds and larger capacities are also available. Check that your computer is compatible with larger capacity drives before getting an SCSI hard disk.