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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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Enclose IPv6 Addresses in URLs in Brackets In a URL, the IPv6 address is enclosed in brackets For example:

The Snippets Manager allows you to import new snippets and organize existing snippets Either select Tools | Code Snippets Manager or press CTRL-K, CTRL-B You ll see the Snippets Manager window, shown in Figure 12-7 The Language drop-down shows what type of snippets you can work with The folders show how snippets are organized Use the Add and Remove buttons to manage folders Click the Import button to find and make new snippets available to the application As you ve seen, snippets give you a well-specified way to quickly write code However, there is a capability that is even more powerful, which is macros, discussed next

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.

http://[ 2001:300:4136:e378:3000:3dd3:3f56:ffa4]/

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)