计算机专业英语key-term chapter 7.doc
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1、【精品文档】如有侵权,请联系网站删除,仅供学习与交流计算机专业英语key-term chapter 7.精品文档.Key Terms - Chapter 7access speedMeasures the amount of time required by the storage device to retrieve data and programs.Blu-ray disc (BD)A type of high-definition disc with a capacity of 25 to 50 gigabytes.capacityCapacity is how much data a
2、 particular storage medium can hold and another characteristic of secondary storage.CD (compact disc)Widely used optical disc format. It holds 650 MB (megabytes) to 1 GB (gigabyte) of data on one side of the CD.CD-R (CD-recordable)Stands for CD-recordable. This optical disc can be written to only on
3、ce. After that it can be read many times without deterioration but cannot be written on or erased. Used to create custom music CDs and to archive data.CD-ROM (compact discread-only memory)Optical disc that allows data to be read but not recorded. Used to distribute large databases, references, and s
4、oftware application packages.CD-RW (compact discrewriteable)A reusable, optical disc that is not permanently altered when data is recorded. Used to create and edit large multimedia presentations.cloud computingData stored at a server on the Internet and available anywhere the Internet can be accesse
5、d.cylinderHard disks store and organize files using tracks, sectors, and cylinders. A cylinder runs through each track of a stack of platters. Cylinders differentiate files stored on the same track and sector of different platters.densityRefers to how tightly the bits (electromagnetic charges) can b
6、e packed next to one another on a floppy disk.disk cachingMethod of improving hard-disk performance by anticipating data needs. Frequently used data is read from the hard disk into memory (cache). When needed, data is then accessed directly from memory, which has a much faster transfer rate than fro
7、m the hard disk. Increases performance by as much as 30 percent.DVD (digital versatile disc or digital video disc)Similar to CD-ROMs except that more data can be packed into the same amount of space. DVDdrives can store 4.7 GB to 17 GB on a single DVD disc or 17 times the capacity of CDs.DVD playerA
8、lso known as DVD-ROM drives.SeeDVD.DVDR (DVD recordable)A DVD with a write-once format that differs slightly from the format of DVD+R. Typically used to create permanent archives for large amounts of data and to record videos.DVD+R (DVD recordable)A DVD with a write-once format that differs slightly
9、 from the format of DVD R. Typically used to create permanent archives for large amounts of data and to record videos.DVD-RAM (DVD random-access memory)A high capacity, maximum-performance disc that allows the user to read the information, write over it, and erase the data if necessary. Used like a
10、floppy disk to copy, delete files, and run programs. It has up to 8 times the storage capacity of a CD and also can be used to read CD and DVD formats.DVD-ROM (DVDread-only memory)Used to distribute full-length feature films with theater-quality video and sound. Also known asDVD players. Are read-on
11、ly.DVD+RW / DVD-RW (DVD rewriteable)Another DVD format to record and erase repeatedly. Able to create and read CD discs along with creating and editing large-scale multimedia presentations.enterprise storage systemUsing mass storage devices, a strategy is designed for organizations to promote effici
12、ent and safe use of data across the networks within their organizations.erasable optical discOptical disc on which the disk drive can write information and also erase and rewrite information. Also known as CD-RW or compact disc rewriteable.external hard driveUses the same technology as an internal h
13、ard disk but is used primarily to complement an internal hard disk by providing additional storage. They are typically connected to a USB or FireWire port on the system unit and are easily removed.file compressionProcess of reducing the storage requirements for a file.file decompressionProcess of ex
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