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Firmware
Hard Disk
Host
Host Adapter
Internal SCSI
Device
IRQ
ISA
Kbyte
Local Bus
Logical Unit
LUN
LVD
Mainboard
Software that is permanently stored in ROM. In the case of BIOS, it can
be accessed during boot time without the aid of an operating or file
system.
A rigid disk permanently sealed into a drive cartridge. A hard disk can
store very large amounts of information magnetically.
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.
A circuit board and/or integrated circuit device that provides a SCSI bus
connection to the computer system.
A SCSI device installed inside the computer cabinet. These devices are
connected in a continuous chain using an unshielded ribbon cable.
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.
Industry Standard Architecture. A type of computer bus used in most
PC's. It allows devices to send and receive data 16-bits at a time.
Kilobyte. A measure of computer storage equal to 1024 bytes.
A way to connect peripherals directly to the computer processor's data
path. It bypasses the slower ISA and EISA buses. PCI is a local bus
standard.
A subdivision, either logical or physical, of a SCSI device. Most devices
have only one logical unit, but up to sixteen are allowed for a 16-bit SCSI
bus and eight are allowed for an 8-bit SCSI bus.
Logical Unit Number. An encoded three-bit number for the logical unit.
Low Voltage Differential. LVD is a robust design methodology that
improves power consumption, data integrity, cable lengths and support
for multiple devices, while providing a migration path for increased I/O
performance.
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 plug-in boards.
Glossary
B-3
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