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GL–6 Glossary
FD SCSI The fast, narrow, differential SCSI bus with an 8-bit data transfer rate of 10
MB/s. See also FWD SCSI and SCSI.
flush The act of writing dirty data from cache to a storage media.
FMU Fault Management Utility.
forced errors A data bit indicating a corresponding logical data block contains
unrecoverable data.
FRU Field Replaceable Unit. A hardware component that can be replaced at the
customer’s location by Compaq service personnel or qualified customer
service personnel.
full duplex A communications system in which there is a capability for 2-way
transmission and acceptance between two sites at the same time.
FWD SCSI A fast, wide, differential SCSI bus with a maximum 16-bit data transfer rate
of 20 MB/s. See also SCSI and FD SCSI.
gigabaud An encoded bit transmission rate of one billion (10
9
) bits per second.
gigabyte A value normally associated with a disk drives storage capacity, meaning a
billion (10
9
) bytes.
half-duplex Pertaining to a communications system in which data can be either
transmitted or received but only in one direction at one time.
host The primary or controlling computer to which a storage subsystem is
attached.
host adapter A device that connects a host system to a SCSI bus. The host adapter usually
performs the lowest layers of the SCSI protocol. This function may be
logically and physically integrated into the host system.