The only other device that must be terminated is the device at the very end of the cable chain. Termination is enabled and disabled by either one of two methods. Either terminating resistor packs are provided or a method such as dip switches or jumpers to enable and disable termination. The more expensive cards provide both internal and external connectors. The internal connectors are used for devices such as SCSI hard drives and removable hard drives like the Zip or Jaz drives.
External devices are usually SCSI scanners and external removable hard drives.
Drivers must be installed to allow the SCSI cards to operate properly. Some cards also have an additional configuration that is performed while the computer boots up. Additionally, you must install drivers for the operating system to use these devices properly. Some cards are supported automatically by certain operating systems like the Windows NT 4.0's support for certain Adaptec cards. SCSI is a very mature technology and is very stable.