Chapter 7Secondary StorageLecture GuideLearning ObjectivesoDistinguish between primary and secondary storage.oIdentify the important characteristics of secondary storage including media, capacity, storage devices, and access speed.oDescribe hard disk platters, tracks, sectors, cylinders, and head crashes.oCompare internal and external hard drives.oCompare performance enhancements including disk caching, RAID, file compression, and file decompression.oDefine optical storage including compact discs, digital versatile discs, and Blu-raydiscs.oDefine solid-state storage including solid-state drives, flash memory cards, and USB drives.oDefine cloud storage and cloud storage services.oDescribe mass storage, mass storage devices, enterprise storage systems, and storage area networks.Chapter OutlineStorageoThe ability to save, to back up and even to transport files consisting of data or programs from one location or computer to another.oRandom-access memory (RAM) holds or stores data and programs that the CPU is currently processing. RAM is sometimes referred to as primary storage. Unfortunately, most RAM provides only temporary or volatile storage – its contents are lost as soon as there is no electrical current going into the system.oSecondary storage provides permanent or nonvolatile storage. Using secondary storage devices, data and programs can be retained after the computer has been shut off.oImportant characteristics of secondary storageMediaare the physical material that holds the data and programs.Capacitymeasures how much a particular storage medium can hold.Storagedevicesare hardware that reads data and programs from storage media. Most also write to storage media.Access speedmeasures the amount of time required by the storage device to retrieve data and programs.Hard Disks oAre sensitive instruments.oSave files by altering the magnetic charges of the disk’s surface to represent 1s and 0s. Show
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Which device is used to process store and retrieve data?A computer is a machine that can be programmed to accept data (input), process it into useful information (output), and store it away (in a secondary storage device) for safekeeping or later reuse.
What is the equipment that stores and retrieve data from its storage?Hard drives, or disks, are a very common storage device for personal computers. There are internal and external hard drives, but both use a magnetic disk to function. Magnetic disks are what store the data that will later be processed to run programs or open files.
What term refers to the amount of time it takes a storage device?What term refers to the amount of time it takes a storage device to locate an item on a storage medium? access time.
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What measures the amount of time required by the storage device to retrieve data and programs?
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