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Disk Management A snap-in available with the Microsoft Management Console that allows a user to configure the various disks installed in a system; available from the Administrative Tools area of the Control Panel Disk mirroring Process by which data is written simultaneously to two or more disk drives Read and write speed is decreased but redundancy in case of catastrophe is increased Disk striping Process by which data is spread among multiple (at least two) drives It increases speed for both reads and writes of data Considered RAID level 0, because it does not provide fault tolerance Disk striping with parity A method for providing fault tolerance by writing data across multiple drives and then including an additional drive, called a parity drive, that stores information to rebuild the data contained on the other drives Requires at least three physical disks: two for the data and a third for the parity drive This provides data redundancy at RAID levels 3 5 with different options Disk thrashing A term used to describe a hard drive that is constantly being accessed due to lack of available system memory When system memory runs low, a Windows system utilizes hard disk space as virtual memory, thus causing an unusual amount of hard drive access Distro Shortened form of distribution, most commonly used to describe the many different delivered packages for Linux operating systems and applications Dithering A technique for smoothing out digitized images; using alternating colors in a pattern to produce perceived color detail DMA (direct memory access) A technique that some PC hardware devices use to transfer data to and from the memory without using the CPU DNS (domain name system) A TCP/IP name resolution system that translates a host name into an IP address DNS domain A specific branch of the DNS name space First-level DNS domains include COM, GOV, and EDU
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Documentation A collection of organized documents or the information recorded in documents In the computer world, instructional material specifying the inputs, operations, and outputs of a computer program or system; for example, a manual and Getting Started card Dolby Digital A technology for sound reductions and channeling methods Domain Term used to describe groupings of users, computers, or networks In Microsoft networking, a domain is a group of computers and users that share a common account database, called a SAM, and a common security policy On the Internet, a domain is a group of computers that share a common element in their hierarchical name Other types of domains exist eg, collision domain, etc Domain controller A Microsoft Windows NT machine that stores the user and server account information for its domain in a database called a SAM (security accounts manager) database DOS (Disk Operating System) The first popular operating system available for PCs It was a text-based, single-tasking operating system that was not completely replaced until the introduction of Windows 95 DOS prompt A symbol, usually a letter representing the disk drive followed by the greater-than sign (>), which tells you that the operating system is ready to receive a command Windows systems use the term command prompt rather than DOS prompt DOSKEY A DOS utility that enables you to type more than one command on a line, store and retrieve previously used command-line commands, create stored macros, and customize all commands DOSKEY is still supported in Windows XP Dot pitch A value relating to CRTs, showing the diagonal distance between phosphors measured in millimeters Dot-matrix printer A printer that creates each character from an array of dots Pins striking a ribbon against the paper, one pin for each dot position, form the dots The printer may be a serial printer (printing one character at a time) or a line printer Double word A unit of 32 binary digits; four bytes
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Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
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Double-side high density A type of floppy disk that is capable of holding 12 MB on a 525-inch disk and 144 MB on a 35-inch disk This format can be read in all modern floppy disk drives Double-sided RAM A RAM stick with RAM chips soldered to both sides of the stick May only be used with motherboards designed to accept double-sided RAM Very common Downstream A term used to define the part of a USB connection that plugs into a USB device DPI (dots per inch) A measure of printer resolution that counts the dots the device can produce per linear (horizontal) inch DRAM (dynamic random access memory or dynamic RAM) The memory used to store data in most personal computers DRAM stores each bit in a cell composed of a transistor and a capacitor Because the capacitor in a DRAM cell can only hold a charge for a few milliseconds, DRAM must be continually refreshed, or rewritten, to retain its data DS3D (DirectSound3D) Introduced with DirectX 30, DS3D is a command set used to create positional audio, or sounds that appear to come from in front, in back, or to the side of a user See also DirectX DSL (digital subscriber line) A high-speed Internet connection technology that uses a regular telephone line for connectivity DSL comes in several varieties, including Asynchronous (ADSL) and Synchronous (SDSL), and many speeds Typical home-user DSL connections are ADSL with a download speed of up to 15 Mbps and an upload speed of 384 Kbps DSP (digital signal processor) A specialized microprocessor-like device that processes digital signals at the expense of other abilities, much as the FPU is optimized for math functions DSPs are used in such specialized hardware as high-speed modems, multimedia sound cards, MIDI equipment, and real-time video capture and compression DTS (Digital Theatre Systems) A technology for sound reductions and channeling methods, similar to Dolby Digital Dual boot Refers to a computer with two operating systems installed, enabling a user to choose which
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operating system to load on boot Can also refer to kicking a device a second time just in case the first time didn t work Dual-channel memory A form of DDR and DDR2 memory access used by many motherboards that requires two identical sticks of DDR or DDR2 RAM Duplexing Also called disk duplexing or drive duplexing Similar to mirroring in that data is written to and read from two physical drives, for fault tolerance Separate controllers are used for each drive, both for additional fault tolerance and additional speed Considered RAID level 1 Duron A lower-cost version of AMD s Athlon series of CPUs DVD (digital versatile disc) An optical media format that provides for 4 17 GB of video or data storage DVD Multi A description given to DVD drives that are capable of reading all six DVD formats DVD+RW A type of rewritable DVD media
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DVD-RAM A type of rewritable DVD media that uses a cartridge DVD-ROM The DVD-ROM is the DVD equivalent of the standard CD-ROM DVD-RW A type of rewritable DVD media
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DVD-Video A DVD format used exclusively to store digital video; capable of storing over 2 hours of high-quality video on a single DVD DVI (digital video interface) A special video connector designed for digital-to-digital connections; most commonly seen on PC video cards and LCD monitors Some versions also support analog signals with a special adapter Dynamic disks A special feature of Windows 2000 and Windows XP that allows a user to span a single volume across two or more drives Dynamic disks do not have partitions; they have volumes Dynamic disks can be striped, mirrored, and striped or mirrored with parity EAX 3-D sound technology developed by Creative Labs, but now supported by most sound cards
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