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sketches, or selecting items from menus on a screen. When the mouse is rolled across the surface of the desk, the cursor moves a corresponding distance on the screen. routines for detection and correction of data errors. A CD-ROM drive may be internally or externally installed. It holds a vast amount of information that makes it valuable to store digital images. Once recorded, information on CD-ROM cannot be erased or changed, but it can be read many times. The expression information. Data is recorded sequentially in the form of magnetic spots along the entire length of the tape. surfaces of rotating disks. The disks are made of thin metal, coated on each side so data can be recorded in the form of magnetized spots. As the disks spin around like a music record, characters can be stored on them or retrieved from them in a random (direct) manner. Accessing data directly has several advantages over accessing data stored sequentially. It provides fast disk drive to read at any point. Magnetic disk drives come in two types: hard drives and floppy drives. Magnetic disk drives are in computer systems and electronic cameras. Floppy disks come in several sizes, ranging from 3 to 8 inches in diameter; the 3 1/2-inch diskette is most common. lower-power laser pickup. Three types of optical disks are used: Read Only (RO), Write Once, Read Many (WORM), and erasable. Two types of erasable disks are used: Thermo Magneto Optical (TMO) and Phase Change (PC). photographs on hardcopy (paper or film). A large range of printers is available. Printers are discussed in more detail later in this chapter. devices. This is accomplished by electrical cables that carry both data and control information between the computer and the peripheral devices. cable provides a path (channel) for the signal to travel. Signals for both monitoring and data are transmitted by way of I/O channels. These I/O channels may be used specifically for data input, data output, or data input and output. On desktop computers, the I/O channels are referred to as communication ports. of communication in one direction. When a peripheral circuit, it is only capable of transmitting data. Simplex circuits are seldom used because a return path is generally required for acknowledgment, control information, or error message. is for receiving data. Advanced Photography Course |
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