Chapter07 - Chapter 7 Storage Chapter 7 Objectives Discuss...

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Chapter 7 Storage
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Chapter 7 Objectives Discuss the various types of items that users store on computer media Differentiate between storage devices and storage media Describe the characteristics of a floppy disk drive Identify the uses of Zip disks Describe the characteristics of a hard disk Identify the advantages of using an Internet hard drive Describe the characteristics of CDs and DVDs Differentiate among CD-ROMs, CD-RWs, DVD-ROMs, and DVD+RWs Identify the uses of tape Discuss PC Cards and the various types of miniature storage media Identify uses of microfilm and microfiche Next
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Storage What is storage? p. 348 Fig. 7-1 Next Holds data, instructions, and information for future use Storage medium is physical material used for storage Also called secondary storage
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Storage What is capacity ? p. 350 Next Kilobyte (KB) 1 thousand Megabyte (MB) 1 million Gigabyte (GB) 1 billion Terabyte (TB) 1 trillion Petabyte (PB) 1 quadrillion Number of bytes (characters) a storage medium can hold Exabyte (EB) 1 quintillion Zettabyte (ZB) 1 sextillion Yottabyte (YB) 1 septillion
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Storage Medium (floppy disks, Zip disks, hard disks, CDs) Storage How does volatility compare? p. 350 Next Nonvolatile Storage medium is nonvolatile—contents retained when power is off Contents Contents retained retained Contents Contents available to user available to user Memory (most RAM) (chips on motherboard) Screen Display ON OFF Volatile Display Display disappears disappears Data and Data and instructions instructions available to user available to user Display Display appears appears Data and Data and instructions erased instructions erased Memory is volatile—holds data and instructions temporarily
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Writing Writing Process of transferring Process of transferring items from memory items from memory to storage media to storage media Storage What is a storage device ? p. 350 Next Reading Reading Process of transferring Process of transferring items from storage items from storage media to memory media to memory Hardware that Hardware that records and records and retrieves items retrieves items to and from to and from storage media storage media Functions as source of input Creates output
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Floppy Disk Small files to be transported Secondary Storage Primary Storage Hard Disk CDs and DVDs Miniature Storage Media Tape Items waiting to be interpreted and executed by the processor Operating system, application software, user data and information Software, backups, movies, music Digital pictures or small files to be transported Backups Memory (most RAM) Stores … Storage What is access time ? p. 350 Time it takes storage device to locate item on storage medium Next Time required to deliver item from memory to processor faster transfer rates slower transfer rates
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Floppy Disks What is a floppy disk ? p. 351 Fig. 7-5
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Chapter07 - Chapter 7 Storage Chapter 7 Objectives Discuss...

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