-
Improved on EDO, but was rarely used. You might encounter it on some 72-pin SIMMs or 168-pin DIMMs
Burst EDO (BEDO)
-
A method of measuring access timing to memory, which is the number of clock cycles required to write or read a row of data off a memory module. CAS stands for Column Access Strobe.
CAS Latency (CL)
-
A placeholder RIMM module that provides continuity so that every RIMM slot is filled.
C-RIMM (Continuity RIMM)
-
An improved version of SDRAM
DDR
-
A version of SDRAM that is faster than DDR and uses less power
DDR2
-
An improvement over DDR and DDR2 that is faster and uses less power
DDR3
-
A memory technology by Rambus and Intel that uses a narrow network-type system bus. Memory is stored on a RIMM module. Also called RDRAM or Direct RDRAM
Direct Rambus DRAM
-
A type of memory technology used on DIMMs that runs at twice the speed of the system clock
Double Data Rate SDRAM
-
A DIMM with memory chips installed on both sides of the module
double-sided
-
A motherboard feature that improves memory performance by providing two 64-bit channels between memory and the chipset.
dual channels
-
Double-sided DIMMs that provide two 64-bit banks
dual ranked
-
A chipset feature on a motherboard that checks the integrity of data stored on DIMMs or RIMMs and can correct single-bit errors in a byte. More advanced can detect, but not correct, double-bit errors in a byte
ECC (error-correcting code)
-
A type of outdated RAM that was faster than conventional RAM because it eliminated the delay before it issued the next memory address
EDO (extended data out)
-
Can be used with 30-pin or 72-pin SIMMs or some really old 168-pin DIMMs.
FPM (fast page memory)
-
A Windows error that occurs when a program attempts to access a memory address that is not available or is no longer assigned to it
General Protection Fault (GPF)
-
The memory a processor addresses at one time and is 64 bits wide
memory bank
-
An error-checking scheme in which a ninth, or "parity," bit is added. The value of the parity bit is set to either 0 or 1 to provide an even number of ones for even parity and an odd number of ones for odd parity
parity
-
An error that occurs when the number of 1s in the byte is not in agreement with the expected number.
parity error
-
A method of measuring access timing to memory, which is the number of clock cycles required to write or read a row of data off a memory module.
RAS (Row Access Strobe) Latency
-
Chips that have been used and returned to the factory, marked again, and resold. The surface of the chips may be dull or scratched.
re-marked chips
-
An outdated type of DRAM with 184 pins.
RIMM
-
An outdated type of DRAM with 72 or 30 pins
SIMM (single inline memory module)
-
A DIMM in which the memory controller can only access one DIMM at a time
Single channel
-
Single-sided DIMMs providing only one 64-bit bank
single ranked
-
A DIMM with memory chips installed on one side of the module
single-sided
-
a smaller version of a DIMM used on laptops
SO-DIMM (small outline DIMM)
-
The first DIMM to run synchronized with the system clock. It has two notches, and uses 168 pins
synchronous DRAM (SDRAM)
-
Accessing three DIMMs at the same time.
triple channels
-
An IDE cable that has 40 pins but uses 80 wires, 40 of which are ground wires designed to reduce crosstalk on the cable
80-conductor IDE cable
-
A nonprofit organization dedicated to creating trade and communications standards
ANSI (American National Standards Institute)
-
An interface standard, part of the IDE/ATA standards, that allows tape drives, CD-ROM drives, and other drives to be treated like an IDE hard drive by the system.
ATAPI (Advanced Technology Attachment Packet Interface)
-
A feature of system BIOS and hard drives that automatically identifies and configures a new drive in CMOS setup
autodetection
-
A single hard drive that works independently of other hard drives
basic disk
-
A method of data transfer between hard drive and memory that allows multiple data transfers on a single software interrupt
block mode
-
One or more sectors that constitute the smallest unit of space on a disk for storing data (also referred to as a file allocation unit).
cluster
-
A transfer mode used by devices, including the hard drive, to transfer data to memory without involving the CPU
DMA (direct memory access) transfer mode
-
A standard for managing the interface between secondary storage devices and a computer system. A system can support up to six serial ATA and parallel ATA IDE devices or up to four parallel ATA IDE devices such as hard drives, CD-ROM drives, and DVD drives.
EIDE (Enhanced IDE)
-
An extended partition can be divided into one or more logical drives. Each logical drive is assigned a drive letter (such as drive G:) and is formatted using its own file system
extended partition
-
standard that specifies full SATA cabling for external disks
external SATA (eSATA)
-
The 12-bit wide, one-column file allocation table for a floppy disk, containing information about how each cluster or file allocation unit on the disk is currently used
FAT12
-
Another term for a cluster
file allocation unit
-
A computer's ability to respond to a fault or catastrophe, such as a hardware failure or power outage, so that data is not lost
fault tolerance
-
A table on a hard drive or floppy disk that tracks how space on a disk is used to store files
file allocation table (FAT)
-
A cluster in the file allocation table (FAT).
file allocation unit
-
The overall structure an OS uses to name, store, and organize files on a drive. In a file system, a cluster is the smallest unit of space on a disk for storing a file and is made up of one or more sectors.
file system
-
The firmware that controls access to a hard drive contained on a circuit board mounted on or inside the hard drive housing. Older hard drives used firmware on a controller card that connected to the drive by way of two cables, one for data and one for control
hard drive controller
-
The top or bottom surface of one platter on a hard drive. Each platter has two
head
-
Formatting performed by means of the DOS or Windows Format program (for example, FORMAT C:/S creates the boot record, FAT, and root directory on drive C and makes the drive bootable). Also called OS formatting
high-level formatting
-
The circuit board that controls a SCSI bus supporting as many as seven or fifteen separate devices. controls communication between the SCSI bus and the PC
host adapter
-
A hard drive whose disk controller is integrated into the drive, eliminating the need for a controller cable and thus increasing speed, as well as reducing price.
IDE (Integrated Device Electronics)
-
A drive that uses both solid state and magnetic technologies
hybrid hard drive
-
A number assigned to a logical device (such as a tray in a CD changer) that is part of a physical SCSI device, which is assigned a SCSI ID
Logical Unit Number (LUN)
-
A process (usually performed at the factory) that electronically creates the hard drive tracks and sectors and tests for bad spots on the disk surface
low-level formatting
-
An older IDE cabling method that uses a 40-pin flat data cable or an 80-conductor cable and a 40-pin IDE connector. See also serial ATA
parallel ATA
-
A transfer mode that uses the CPU to transfer data from the hard drive to memory. slower than DMA mode
PIO (Programmed Input/Output) transfer mode
-
A sealed, magnetic coil device that moves across the surface of a disk either reading data from or writing data to the disk
read/write head
-
Windows Vista technology that supports a hybrid drive
ReadyDrive
-
A fast interface between a host adapter and the CPU that can daisy chain as many as 7 or 15 devices on a single bus
SCSI (Small Computer System Interface)
-
A number from 0 to 15 assigned to each SCSI device attached to the daisy chain
SCSI ID
-
commonly called the host adapter. The host adapter is inserted into an expansion slot on the motherboard and is responsible for managing all devices on the SCSI bus. A host adapter can support both internal and external SCSI devices, using one connector on the card for a ribbon cable or round cable to connect to internal devices, and an external port that supports external devices.
SCSI host adapter card
-
An ATAPI cabling method that uses a narrower and more reliable cable than the 80-conductor cable. See also parallel ATA
serial ATA (SATA)
-
An IDE cable that is narrower and has fewer pins than the parallel IDE 80-conductor cable.
serial ATA cable
-
A self-monitoring technology whereby the BIOS monitors the health of the hard drive and warns of an impending failure.
S.M.A.R.T. (Self-Monitoring Analysis and Reporting Technology)
-
The resistor added at the end of a SCSI chain to dampen the voltage at the end of the chain.
terminating resistor
-
The primary partition. The volume is assigned a drive letter (such as drive C: or drive D:) and is formatted using a file system.
Volume
-
An input device that inputs biological data about a person; the data can identify a person's fingerprints, handprints, face, voice, eye, and handwriting.
Biometric device
-
A condition in which chips loosen because of thermal changes
chip creep
-
The number assigned a serial port that determines the system resources used by the port.
COM1 (communications port 1)
-
An older technology used by monitors in which the filaments at the back of a cathode tube shoot a beam of electrons to the scrren at the front of the tube.
CRT (cathode-Ray Tube)
-
A button on a CRT monitor that can be pressed to eliminate accumulated or tray magnetic fields around the monitor which can cause CRT monitor to flicker or have wavy lines
Degauss button
-
A DVI (Digital Visual Interface) viseo port that works only with digital monitors
DVI-D
-
A DVI video port that supports both anolog and digital monitors
DVI-I
-
A Windows command to display info about hardware and diagnose problems with DirectX
dxdiag.exe
-
A bedirectional parallel port mode that uses a DMA channel to speed up data flow.
ECP (Extended Capabilities Port)
-
"Green" systems that satisfy the EPA requirements to decrease the overall consumption of electricity
Energy Star
-
A parallel port that allows data to flow in both directions and is faster than original ports on PCs that allow communication only in one direction.
EPP (Enhanced Parallel Port)
-
A device used to house and protect a hard drive outside the computer case and connect it to on eSATA, USB, or other type of port on the computer. Also called a toaster
hard drive dock
-
A digital audio and viseo interface dtandard currently used on televisions and other home theater equipment and expencted to ultimately replace DVI.
HDMI (High-Definition Multimedea Interface)
-
A network device or box that provides a central location to connect cables and sidtributes incoming data packets to all other devices connected to it,
Hub
-
A standard for parallel ports and cables developed bu the Institute for Electrical and Electronics Engineers an dsupported bu hardware manufacturers.
IEE 1284
-
Standards for an expansion bus that can also be configured to work as a local bus. It is expected to replace tha SCSI bus, providing an easy method to install and configure fast I/O devices. Also called FireWire and i.Link
IEEE 1394
-
A standard, developed by the 1394 Trade Assiciation, that is designed for peer-to-peer data transmission and allows imaging devices to send images and photos directly to printers without involving a computer
IEE 1394.3
-
A wireless transceiver that uses infrared technology to support some wireless devices such as keyboards, mice, and printers.
Infrared tranceiver
-
A line on a bus that is assigned to a device and is used to signal the CPU for servicing. These lines are assigned a reference number
IRQ (Interrupt ReQuest) Line
-
A method used by the IEEE 1394 and other technologies to transfer data continuously without breaks.
isonchronous data transfer
-
A switch allows you to use one keyboard, mouse, and monitor for multiple computers.
KVM (Keyboard, Video, and Mouse) Switch
-
A monitor that uses LCD technology. Prodices an image using a liquid crystal material made of large, easily polarized meloecules. Flatter than CRT and take up less space.
- LCD (Liquid Crystal Display) Monitor
- or
- flat-panel monitor
-
Assignments of system resources that are made to a parallel port and that are used to manage a print job.
LPT (Line Printer Terminal)
-
The actual (and fixed) number of pixels built into a LCD monitor.
Native Resolution
-
A type of display in which the electronic beam of a CRT monitor draws every line on the screen with each pass
noninterlaced
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