circuitry of a computer processor, contained on a small silicon chip. It stores program instructions that process, or manipulate, data into information. Q 2. Describe various devices used to store data before and after it is processed.> Secondary storage is all data storage that is not currently in a computer’s primary storage (main memory, or RAM).
and are clamped to a rotating spindle that turns all the platters in unison. Hard disks are tightly sealed within an enclosed hard-disk-drive unit to prevent any foreign matter from getting inside. Data may be recorded on both sides of the disk platters. Hard disks store data in tracks, sectors, and clusters.Optical Disks: CDs, DVDs, & Blu-ray Disks:The optical disk is the preferred medium for music, movies, and software programs because of its advantages: compact, lightweight, durable, and digital. An optical disk is a removable disk, usually 4.75 inches in diameter and about .05inch thick, on which data is written and read through the use of laser beams. An audio CD holds up to 74 minutes of high-fidelity stereo sound. Some optical disksare used strictly for digital data storage, but many are used to distribute multimedia programs that combine text, visuals, and sound.Flash & Solid-State Memory:Flash memory and solid-state memory have become the most important form of mobile secondary storage. Disk drives, whether for hard disks or CDs/DVDs, all involve some moving parts—and moving parts can break. By contrast, flash memory, which is a variation on conventional computer memory chips, has no moving parts; it is “solid state.” Flash memory is also nonvolatile—it retains data even when the power is turned off. A drawback, however, is that flash memory
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- Summer '17
- ALBERT DOMINIC
- Flash memory, power supply, smart cards, hard disks