计算机基本知识(第4课).pptVIP

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计算机基本知识(第4课).ppt

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Tape What is tape? p. 374 Fig. 7-27 Next Magnetically(磁性的) coated plastic ribboncapable of storing large amountsof data at low cost Primarily used for backup(备份) Tape How is data stored on a tape? p. 374 Next Sequential(按次序的) access Unlike direct access — used on hard disks, CDs, and DVDs — which can locate(指出) particular(特定的) item immediately Reads and writes data consecutively(连贯的), like music tape PC Cards and ExpressCard Modules What are PC Cards and ExpressCard Modules? p. 374 Figs. 7-28 Next Adds capabilities to computer Credit-card(信用卡)-sized device commonly used in notebook computers Miniature Mobile Storage Media What is miniature(微型的) mobile storage media? p. 375 Fig. 7-29 Next Storage for small mobile devices Miniature Mobile Storage Media What are common types of flash memory cards? p. 376 Fig. 7-30 Next CompactFlash Secure Digital xD Picture Card Memory Stick Memory Stick PRO Duo Miniature Mobile Storage Media p. 377 Fig. 7-31 Next How does one type of flash memory card work? Miniature Mobile Storage Media What is a USB Flash Drive? p. 377 Fig. 7-32 Next Plugs in a USB port on a computer or mobile device Storage capacities up to 64 GB May eventually make the floppy disk obsolete(过时的) Miniature Mobile Storage Media What is a smart card? p. 378 Fig. 7-33 Next Stores data on microprocessor(微处理机) embedded in small card Input, process, output, and storage capabilities Microfilm and Microfiche What are microfilm and microfiche(单片缩影胶片)? p. 379 Fig. 7-34 Next Images recorded using computer output microfilm recorder Store microscopic(微小的) images of documents on roll(卷) or sheet of film Microfilm — 100- to215-foot roll of film Microfiche — small sheet of film, usually 4” ? 6” Microfilm and Microfiche How do life(寿命) expectancies of various media compare? p. 379 Fig. 7-35 Next Microfilm and microfiche have longest life of any storage media Putting It All Together What are recommended storage devices for home users? p. 380 Fig. 7-37 Next 250 GB hard disk O