Secondary Storage
Confirming Pages Secondary Storage Competencies After you have read this chapter, you should be able to: 1 Distinguish between primary and secondary storage. 2 Discuss the important characteristics of secondary storage including media, capacity, storage devices, and access speed. 3 Describe hard disk platters, tracks, sectors, and head crashes. 4 Compare internal and external hard drives. 5 Discuss performance enhancements including disk caching, RAIDs, file compression, and file decompression. 6 Define optical storage including compact, digital versatile, and high-definition discs. 7 Define solid-state storage including solid-state drives, flash memory, and USB drives. 8 Define cloud storage and cloud storage services. 9 Discuss mass storage devices, enterprise storage systems, and storage area networks. At one time, floppy disks were the only way to Some experts predict that the future of distribute software and the only way to share files secondary storage is holographic. Compact discs between personal computers. These disks were use two dimensions to record data, but advances everywhere, and they were essential, but they in optics now make it possible to record data in were also extremely fragile. Today’s compact three dimensions. This holographic data storage discs and USB flash drives are more reliable and could make it possible to inexpensively store hold more information than hundreds of floppy hundreds of today’s DVDs on one disc. Imagine a disks, and there are even more exciting advances single disk that can hold hundreds of movies and yet to come. thousands of songs. 220 oole16805_ch08_220-247.inddle16805_ch08_220-247.indd 222020 112/10/102/10/10 110:310:31 PPMM Confirming Pages chapter 8 221 oole16805_ch08_220-247.inddle16805_ch08_220-247.indd 222121 112/10/102/10/10 110:310:31 PPMM Confirming Pages Introduction Secondary storage devices are used to save, to back up, and even to transport files consisting of data or programs from one location or computer to another.
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