Discovering Computers - Chapter 7: Storage

Discovering Computers - Chapter 7: Storage Differentiate between storage devices and storage media; Describe the characteristics of magnetic disks; Differentiate between floppy disks and Zip disks; Describe the characteristics of a hard disk.

Chapter Storage Chapter Objectives Differentiate between storage devices and storage media Describe the characteristics of magnetic disks Differentiate among CD-ROMs, recordable CDs, rewritable CDs, DVD-ROMs, recordable DVDs, and rewritable DVDs Differentiate between floppy disks and Zip disks Identify the uses of tape Describe the characteristics of a hard disk Discuss PC Cards and the various types of miniature mobile storage media Describe the characteristics of optical discs Identify uses of microfilm and microfiche Next Storage What is storage? Holds data, instructions, and information for future use  Storage medium is physical material used for storage   Also called secondary storage p 354 Fig 7-1 Next Storage What is capacity?  Number of bytes (characters) a storage medium can hold Kilobyte (KB) thousand Megabyte (MB) million p 356 Gigabyte (GB) billion Terabyte (TB) trillion Petabyte (PB) quadrillion Exabyte (EB) quintillion Zettabyte (ZB) sextillion Yottabyte (YB) septillion Next Storage How does volatility compare? Nonvolatile Volatile  Storage medium is nonvolatile—contents retained when power is off  Memory is volatile—holds data and instructions temporarily p 356 ON OFF Screen Display Display appears Display disappears Memory (most RAM) (chips on motherboard) Data and instructions available to user Data and instructions erased Storage Medium (floppy disks, Zip disks, hard disks, CDs) Contents available to user Contents retained Next Storage What is a storage device? 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 p 356 Writing Process of transferring items from memory to storage media Creates output Next Storage What is access time?   Time it takes storage device to locate item on storage medium Time required to deliver item from memory to processor faster transfer rates Stores … Primary Storage Memory (most RAM) Items waiting to be interpreted and executed by the processor Secondary Storage Hard Disk Flash Memory Cards and USB Flash Drives Operating system, application software, user data and information Digital pictures or files to be transported CDs and DVDs Software, backups, movies, music Tape slower transfer rates p 357 Fig 7-4 Floppy Disk Backups Small files to be transported Next Magnetic Disks What are tracks and sectors? Track is narrow recording band that forms full circle on disk Sector stores up to 512 bytes of data Formatting prepares disk for use and marks bad sectors as unusable p 357 Fig 7-5 Next Magnetic Disks What is a floppy disk?  shutter Portable, inexpensive storage medium (also called diskette) shell liner magnetic coating Thin, circular, flexible film enclosed in 3.5” wide plastic shell Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Floppy Disks below Chapter p 358 metal hub flexible thin film Next Magnetic Disks What is a floppy disk drive?  Device that reads from and writes to floppy disk   One floppy drive, named drive A Also called secondary storage Floppy disk drive built into a desktop computer External floppy disk drive attaches to a computer with a cable p 358 Fig 7-6 Next Tape How is data stored on a tape?  p 374 Sequential access  Reads and writes data consecutively, like music tape  Unlike direct access — used on floppy disks, Zip disks, hard disks, CDs, and DVDs — which can locate particular item immediately Next PC Cards What is a PC Card?   Adds capabilities to computer Credit-card-sized device commonly used in notebook computers p 374 Figs 7-29–7-30 Next Miniature Mobile Storage Media What is miniature mobile storage media?  Storage for small mobile devices p 375 Fig 7-31 Next Miniature Mobile Storage Media What are common types of flash memory cards? CompactFlash Smart Media xD Picture Card Secure Digital Memory Stick Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Flash Memory Cards below Chapter p 376 Fig 7-32 Next Miniature Mobile Storage Media How does one type of flash memory card work? p 377 Fig 7-33 Next Miniature Mobile Storage Media What is a USB Flash Drive?    Plugs in a USB port on a computer or mobile device Storage capacities up to GB May eventually make the floppy disk obsolete p 377 Fig 7-34 Next Miniature Mobile Storage Media What is a smart card?   Stores data on microprocessor embedded in small card Input, process, output, and storage capabilities Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Smart Cards below Chapter p 378 Fig 7-35 Next Microfilm and Microfiche What are microfilm and microfiche? Store microscopic images of documents on roll or sheet of film Images recorded using computer output microfilm recorder Microfilm — 100- to 215-foot roll of film p 379 Fig 7-36 Microfiche — small sheet of film, usually 4”  6” Next Microfilm and Microfiche How life expectancies of various media compare?  Microfilm and microfiche have longest life of any storage media p 379 Fig 7-37 Next Putting It All Together What are recommended storage devices for home users?      80 GB hard disk Online storage CD or DVD drive Card reader/writer USB flash drive and/or 3.5-inch floppy disk drive Home p 380 Fig 7-38 Next Putting It All Together What are recommended storage devices for small office/home office (SOHO) users?       Small Office/ Home Office (SOHO) p 380 Fig 7-38 750 MB Zip drive 120 GB hard disk Online storage CD or DVD drive External hard drive for backup USB flash drive and/or 3.5-inch floppy disk drive Next Putting It All Together What are recommended storage devices for mobile users?       Mobile p 380 Fig 7-38 80 GB hard disk Online storage CD or DVD drive Card reader/writer Portable hard disk for backup USB flash drive, and/or GB PC Card hard disk, and/or 3.5-inch floppy disk drive Next Putting It All Together What are recommended storage devices for power users?      CD or DVD drive 300 GB hard disk Online storage Portable hard disk for backup USB flash drive and/or 3.5-inch floppy disk drive Power p 380 Fig 7-38 Next Putting It All Together What are recommended storage devices for large business users? Large Business p 380 Fig 7-38  Desktop computer 160 GB hard disk CD or DVD drive Smart card reader Tape drive USB flash drive and/or 3.5-inch floppy disk drive  Server or Mainframe Network storage server 40 TB hard disk system CD-ROM or DVD-ROM server Microfilm or microfiche Next Summary of Storage Floppy disks Recordable DVDs Zip disks Rewritable DVDs Internal hard disks Tape Portable hard disks PC Cards Recordable CDs Rewritable CDs DVD-ROMs Chapter Complete Flash memory cards and USB flash drives Smart cards, microfilm, and microfiche ... future use  Storage medium is physical material used for storage   Also called secondary storage p 354 Fig 7-1 Next Storage What is capacity?  Number of bytes (characters) a storage medium.. .Chapter Objectives Differentiate between storage devices and storage media Describe the characteristics of magnetic disks Differentiate among CD-ROMs, recordable CDs, rewritable CDs, DVD-ROMs,... view Web Link, click Chapter 7, Click Web Link from left navigation, then click CD-ROMs below Chapter p 369 Fig 7-2 4 Next Optical Discs What is the data transfer rate of a CD-ROM drive? Ranges