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Technical Glossary

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ECC	Error Correction Code. The incorporation of extra parity bits in transmitted data in order to detect errors that can be corrected by the controller.
EDC	Error Detection and Correction
EDSA™ FIC	Enhanced Datamover and Storage Accelerator Flash I/O Controller
E-Disk^® Drive	BiTMICRO's flagship solid state disk product (Electronic Disk)
EIA	Electronic Industries Association: a trade association representing the U.S. high technology community which began life in 1924 as the Radio Manufacturers Association. It has been responsible for developing some important standards, such as the RS-232, RS-422 and RS-423 standards for connecting serial devices. In 1988, it spun off its Information & Telecommunications Technology Group into a separate organization known as the TIA.
E_Port	An expansion port connecting two switches to make a Fabric
Exchange	The highest-level Fibre Channel mechanism used for communication between N_Ports.

Fabric	One or more Fibre Channel switches in some networked topology.
Fabric port count	The number of ports available for connection by nodes in a Fabric.
Fabric topology	The arrangement of switches that form a Fabric.
Fan-in	The ratio of hosts to storage devices.
Fan-out	The ratio of storage devices to hosts.
Fast SCSI	See SCSI Fast.
FAT	File Allocation Table: the file system used by DOS and Windows to manage files stored on hard disks, floppy disks, and other disk media. The file system takes its name from an on-disk data structure known as the file allocation table, which records where individual portions of each file are located on the disk. Earlier versions of Windows used the 16-bit version known as FAT16. Windows 98 has the option of using FAT32, which supports larger partition sizes and smaller cluster sizes, thereby improving disk performance and increasing available disk space. See also VFAT.
FCA	Fibre Channel Association.
FC-0	Lowest layer on Fibre Channel transport; represents the physical media.
FC-1	This layer contains the 8b/10b encoding scheme.
FC-2	This layer handles framing and protocol, frame format, sequence/exchange management, and ordered set usage.
FC-3	This layer contains common services used by multiple N_Ports in a node.
FC-4	This layer handles standards and profiles for mapping upper-level protocols such as SCSI and IP onto the Fibre Channel Protocol.
FC-AL	Fibre Channel Arbitrated Loop.
FC-AV	Fibre Channel Audio Visual.
FC-CT	Fibre Channel Common Transport.
FC-FG	Fibre Channel Generic requirements.
FC-FLA	Fibre Channel Fabric Loop Attachment.
FC-FS	Fibre Channel Framing and Signaling.
FC-GS	Fibre Channel Generic Services.
FC-GS-2	Fibre Channel second-generation generic services.
FC-GS-3	Fibre Channel third-generation generic services.
FC_IP	Fibre channel over IP protocol.
FC_SB	Fibre Channel Single Bytes.
FC-SW	Fibre Channel Switch Fabric
FDDI	Fibre Distributed Data Interface.
Fibre Channel	A high-speed, serial, bi-directional, topology independent, multi-protocol, highly scalable interconnection between computers, peripherals, and networks.
Fiber Channel Arbitrated Loop (FC-AL)	FC-AL places up to 126 devices on a loop to share bandwidth. Typically, this is done using a star layout that is logically a loop, employing a Fibre Channel hub. This allows IT managers to add or remove devices without having to bring the entire loop down.
Fill word	The primitive signal used by L_Ports to be transmitted between frames.
FL_Port	A Fabric loop port to which a loop attaches
Flash	Programmable NVRAM memory that maintains its contents without power.
Format	To write a magnetic track pattern onto a disk surface, specifying the locations of the tracks and sectors. This information must exist on a disk before it can store data.
Formatted Capacity	Formatted Capacity-the amount of room left to store data on a disk after writing sector headers, boundary definitions, and timing information during a format operation.
Form Factor	The industry standard that defines the physical, external dimensions of a particular device.
FRU	Field Replaceable Unit.
Full duplex	Concurrent transmission and reception of data on a link.

Gateway	A device that connects incompatible networks by providing the necessary translation, both for hardware and software.
GBIC	Gigabit Interface Converter.
Gbps	Gigabits per second.
Gigabit	1,062,500,000 bits per second.
Gigabyte (GB)	One billion bytes (one thousand megabytes).
GLM	Gigabit Link Module.

Half-height	Standard drive size equivalent to half the vertical space of a 5 1/4-inch drive.
Hard Disk	A type of storage medium that retains data as magnetic patterns on a rigid disk, usually made of a magnetic thin film deposited on an aluminum or glass platter. Magnetic read/write heads are mounted on an actuator that resembles a record needle pickup arm.
HBA	A SCSI-2 adapter that plugs into a host and lets the host communicate with a device. The HBA usually performs the lower level of the SCSI protocol and normally operates in the initiator role.
Hop count	Hop count is the number of ISLs a frame must traverse to get from its source to its destination.
Host Adapter	A plug-in board that acts as the interface between a computer system bus and the disk drive.
HVD	High Voltage Differential: the logic signaling system originally defined in the SCSI-2 standard. HVD has a maximum logic voltage of 5V and uses a paired plus and minus signal level to reduce the effects of noise on the SCSI bus. It was functionally replaced by LVD (Low Voltage Differential) in the SCSI-3 variant of the standard. HVD and LVD SCSI are not directly compatible but can be interconnected by the use of a special adapter.

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