File | A named collection of information stored on a disk. |
Firmware | Software that is permanently stored in ROM. Therefore, it can be |
| accessed during boot time. |
Hard Disk | A disk made of metal and permanently sealed into a drive cartridge. A |
| hard disk can store very large amounts of information. |
Host | The computer system in which a SCSI host adapter is installed. It uses |
| the SCSI host adapter to transfer information to and from devices |
| attached to the SCSI bus. |
Host Adapter | A circuit board or integrated circuit that provides a SCSI bus connection |
| to the computer system. |
Internal SCSI | A SCSI device installed inside the computer cabinet. These devices are |
Device | connected in a continuous chain using an unshielded ribbon cable. |
IRQ | Interrupt Request Channel. A path through which a device can get the |
| immediate attention of the computer’s CPU. The PCI bus assigns an IRQ |
| path for each SCSI host adapter. |
ISA | Industry Standard Architecture. A type of computer bus used in most |
| PCs. It allows devices to send and receive data up to 16 bits at a time. |
Kbyte | Kilobyte. A measure of computer storage equal to 1024 bytes. |
Local Bus | A way to connect peripherals directly to computer memory. It bypasses |
| the slower ISA and EISA buses. PCI is a local bus standard. |
Logical Unit | A subdivision, either logical or physical, of a SCSI device (actually the |
| place for the device on the SCSI bus). Most devices have only one logical |
| unit, but up to eight are allowed for each of the eight possible devices on |
| a SCSI bus. |
LUN | Logical Unit Number. An identifier, zero to seven, for a logical unit. |
LVD Link | Low Voltage Differential link allows greater Ultra2 SCSI device |
| connectability and longer SCSI cables. LVD Link lowers the amplitude of |
| noise reflections and allows higher transmission frequencies. Detailed |
| information may be found in Section 1.3.4, “LVD Link Technology”. |
Mainboard | A large circuit board that holds RAM, ROM, the microprocessor, custom |
| integrated circuits, and other components that make a computer work. It |
| also has expansion slots for host adapters and other expansion boards. |