Chapter07 - Discovering Computers 2009 Chapter 7 Storage...

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Unformatted text preview: Discovering Computers 2009 Chapter 7 Storage Chapter 7 Objectives Differentiate between storage devices and storage media Describe the characteristics of magnetic disks Describe the characteristics of a hard disk Discuss various types of miniature, external, and removable hard disks Describe the characteristics of optical discs Differentiate among CD-ROMs, recordable CDs, rewritable CDs, DVD- ROMs, BD-ROMs, HD DVD-ROMs, recordable DVDs, and rewritable DVDs Identify the uses of tape Discuss PC Cards, ExpressCard modules, and the various types of miniature mobile storage media Identify uses of microfilm and microfiche Next Storage What is storage ? p. 354 - 355 Fig. 7- 1 Next Holds data, instructions, and information for future use Storage medium is physical material used for storage Also called secondary storage Storage What is capacity ? p. 356 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 Storage Medium (hard disks, CDs, DVDs, USB flash drives, etc.) Storage How does volatility compare? p. 355 - 356 Next Nonvolatil e Storage medium is nonvolatilecontents retained when power is off Contents retained Contents available to user Memory (most RAM) (chips on motherboard) Screen Display ON OFF Volatile Display disappears Data and instructions available to user Display appears Data and instructions erased Memory is volatileholds data and instructions temporarily Writing Process of transferring items from memory to storage media Storage What is a storage device ? p. 356 Next Reading Process of transferring items from storage media to memory Hardware that records and retrieves items to and from storage media Functions as source of input Creates output Secondary Storage Primary Storage Hard Disk Flash Memory Cards and USB Flash Drives CDs and DVDs Tape Items waiting to be interpreted and executed by the processor Operating system, application software, user data and information Digital pictures or files to be transported Software, backups, movies, music Backups Memory (most RAM) Stores Transfer rates Storage What is access time ? p. 357 Fig. 7-4 Time it takes storage device to locate item on storage medium Next Time required to deliver item from memory to processor fast er tran sfer rate s slow er tran sfer rate s Magnetic Disks p. 357 Fig. 7-5 Next What are tracks and sectors? Formatting prepares disk for use Track is narrow recording band that forms full circle on disk Sector stores up to 512 bytes of data Perpendicular recording Magnetic Disks What is a hard disk ?...
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Chapter07 - Discovering Computers 2009 Chapter 7 Storage...

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