Samsung NP-R40 User Manual

Also see for NP-R40: Manual

Contents

156 Users ManualHard driveAlso called fixed disk. A hard drive is connected to the computer and can beinstalled or removed. Data written to a hard drive remains until it is overwrittenor corrupted.The 2.5-inch hard drive in your computer was designed for use in a notebookcomputer. Because hard drives in notebook computers are smaller than those indesktop computers, their maximum storage capacity may be less than that ofdesktop hard drives. However, because of their smaller size, the drives handleshock and vibration better than larger drives, which is important for a notebookcomputer.I/OInput/output. Refers to peripheral devices, such as printers, that are addressedthrough an I/O address.I/O addressI/O stands for input/output. Peripheral devices, such as printers, are addressedthrough the I/O port address.IRQ (interrupt request line)The IRQ is a hardware line that a device uses to signal the microprocessor whenthe device needs the microprocessor’s services. The number of IRQs is limited byindustry standards.LCD (liquid-crystal display)The LCD screen on your computer differs from the display screen of a desktopmonitor. Most desktop monitors use CRT (cathode-ray tube) displays, whichwork by moving an electron beam across phosphor dots on the back of the screen.The phosphor dots light up to show the image. LCDs use a liquid-crystal solutionbetween two sheets of polarizing material. Electric current passing through theliquid aligns the crystals so that light can or cannot pass through them, creating animage.MB (megabyte)1,024 kilobytes.Megabit1,048,576 bits or about 128 kilobytes.Operating systemA program that supervises the computer's operation, including handling I/O.Application programs and users can request operating-system services. A usermight request operation-system services to copy files or format a disk. Anapplication program might use the operating system to obtain keyboard input,write data to a file, or write data to a screen.