Dell Precision 390 User Manual

Also see for OptiPlex 390: Setup & features Quick reference guide Specifications Specifications Setup & features

Contents

RAID — redundant array of independent disks — A method of providing data redundancy. Some common implementations of RAID include RAID 0, RAID 1,RAID 5, RAID 10, and RAID 50.RAM — random-access memory — The primary temporary storage area for program instructions and data. Any information stored in RAM is lost when you shutdown your computer.readme file — A text file included with a software package or hardware product. Typically, readme files provide installation information and describe newproduct enhancements or corrections that have not yet been documented.read-only — Data and/or files you can view but cannot edit or delete. A file can have read-only status if:¡ It resides on a physically write-protected floppy disk, CD, or DVD.¡ It is located on a network in a directory and the system administrator has assigned rights only to specific individuals.refresh rate — The frequency, measured in Hz, at which your screen's horizontal lines are recharged (sometimes also referred to as its vertical frequency). Thehigher the refresh rate, the less video flicker can be seen by the human eye.resolution — The sharpness and clarity of an image produced by a printer or displayed on a monitor. The higher the resolution, the sharper the image.RFI — radio frequency interference — Interference that is generated at typical radio frequencies, in the range of 10 kHz to 100,000 MHz. Radio frequencies areat the lower end of the electromagnetic frequency spectrum and are more likely to have interference than the higher frequency radiations, such as infraredand light.ROM — read-only memory — Memory that stores data and programs that cannot be deleted or written to by the computer. ROM, unlike RAM, retains itscontents after you shut down your computer. Some programs essential to the operation of your computer reside in ROM.RPM — revolutions per minute — The number of rotations that occur per minute. Hard drive speed is often measured in rpm.RTC — real time clock — Battery-powered clock on the system board that keeps the date and time after you shut down the computer.RTCRST — real-time clock reset — A jumper on the system board of some computers that can often be used for troubleshooting problems.SSAS — serial attached SCSI — A faster, serial version of the SCSI interface (as opposed to the original SCSI parallel architecture).SATA — serial ATA — A faster, serial version of the ATA (IDE) interface.ScanDisk — A Microsoft utility that checks files, folders, and the hard disk's surface for errors. ScanDisk often runs when you restart the computer after it hasstopped responding.SCSI — small computer system interface — A high-speed interface used to connect devices to a computer, such as hard drives, CD drives, printers, andscanners. The SCSI can connect many devices using a single controller. Each device is accessed by an individual identification number on the SCSI controllerbus.SDRAM — synchronous dynamic random-access memory — A type of DRAM that is synchronized with the optimal clock speed of the processor.serial connector — An I/O port often used to connect devices such as a handheld digital device or digital camera to your computer.Service Tag — A bar code label on your computer that identifies your computer when you access Dell Support at support.dell.com or when you call Dell forcustomer service or technical support.setup program — A program that is used to install and configure hardware and software. The setup.exe or install.exe program comes with most Windowssoftware packages. Setup program differs from system setup.shortcut — An icon that provides quick access to frequently used programs, files, folders, and drives. When you place a shortcut on your Windows desktopand double-click the icon, you can open its corresponding folder or file without having to find it first. Shortcut icons do not change the location of files. If youdelete a shortcut, the original file is not affected. Also, you can rename a shortcut icon.SIM — Subscriber Identity Module — A SIM card contains a microchip that encrypts voice and data transmissions. SIM cards can be used in phones or portablecomputers.smart card — A card that is embedded with a processor and a memory chip. Smart cards can be used to authenticate a user on computers equipped for smartcards.S/PDIF — Sony/Philips Digital Interface — An audio transfer file format that allows the transfer of audio from one file to another without converting it to andfrom an analog format, which could degrade the quality of the file.standby mode — A power management mode that shuts down all unnecessary computer operations to save energy.Strike Zone™ — Reinforced area of the platform base that protects the hard drive by acting as a dampening device when a computer experiences resonatingshock or is dropped (whether the computer is on or off).surge protectors — Prevent voltage spikes, such as those that may occur during an electrical storm, from entering the computer through the electrical outlet.Surge protectors do not protect against lightning strikes or against brownouts, which occur when the voltage drops more than 20 percent below the normalAC-line voltage level.Network connections cannot be protected by surge protectors. Always disconnect the network cable from the network connector during electrical storms.SVGA — super-video graphics array — A video standard for video cards and controllers. Typical SVGA resolutions are 800 x 600 and 1024 x 768.The number of colors and resolution that a program displays depends on the capabilities of the monitor, the video controller and its drivers, and the amount ofvideo memory installed in the computer.S-video TV-out — A connector used to attach a TV or digital audio device to the computer.