Storage Devices - Storage What is storage? Holds data,...

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Storage What is storage? 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 ? 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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Writing Writing Process of transferring items from memory items from memory to storage media to storage media 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 ? Reading Reading Process of transferring Process of transferring items from storage items from storage media to memory media to memory 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 ? Time it takes storage device to locate item on storage medium 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 ? Portable, inexpensive storage medium ( also called diskette ) Thin, circular, flexible film enclosed in 3.5” wide plastic shell shutter shell liner magnetic coating flexible thin film metal hub
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Floppy Disks What is a floppy disk drive ? Floppy disk drive built into a desktop computer External floppy disk drive attaches to a computer with a cable Also called secondary storage One floppy drive, named drive A If two floppy drives, second designated as drive B Device that reads from and writes to floppy disk
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Floppy 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
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Floppy Disks How do you compute a disk’s storage capacity? Multiply number of sides, number of tracks, number of sectors per track, and number of bytes per sector For high-density disk: 2 sides × 80 tracks × 18 sectors per track × 512 bytes per sector = 1,474,560 bytes
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Floppy Disks Never open the shutter and touch the disk’s surface Never open the
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This note was uploaded on 10/22/2011 for the course ECONOMICS 105 taught by Professor Ak during the Spring '11 term at Punjab Engineering College.

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Storage Devices - Storage What is storage? Holds data,...

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