Chap 7 Storage - Chapter 7 Storage Main Memory Memory Is a...

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Chapter 7 Storage
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Main Memory Memory  Is a temporary holding area It holds the current set of instructions and the data these  instructions manipulate while they are being processed by the  CPU Is also referred to as Primary Storage Consists of one or more chips, usually located on the  motherboard Two basic types Volatile  Most RAM Nonvolatile Nonvolatile ROM chips
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(Secondary) Storage (Secondary) Storage Storage  Refers to the media on  which data, instructions and  information are kept Includes the storage  devices that record and  retrieve these items Is nonvolatile so used for  permanent storage Is also called Secondary  Storage, auxiliary storage,  or mass storage
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Storage versus Memory When you want to work with a file, you copy it from storage and place it in memory When you are finished with the file, you copy it from memory to storage
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Storage versus Memory State of Computer ON OFF Screen Display Volatile Contents of Storage Nonvolatile Contents of Memory (most RAM) Volatile C6578 print cartridge $30.25 per cartridge 2 cartridges $60.50 total due
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Storage Devices and Media Storage Devices Computer hardware that records to and retrieves  items from a storage medium Serve as both input and output devices Input device when it reads from a storage medium Output device when it writes to a storage medium Storage Media The physical material on which a computer keeps  data, instructions, and information There are numerous types of storage  devices and media
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Access Time A characteristic of  Storage Media that  Defines the speed of  a storage device Access time =  Amount of time it  takes a storage  device to locate an  item Measured in  milliseconds (1,000 th   of a second RAM Tape Cost Access  Time  Most Least Fastest Slowest Flash Drive
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Storage Media - Floppy Disks Floppy Disks = Diskette Thin, circular, flexible  plastic disk with a magnetic  coating enclosed in a hard  shell Portable and inexpensive Originally 8-inches, then  5.25-inches in diameter Currently 3.5-inches Used on many types of  computers, use is  decreasing rapidly
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Storage Media - Floppy Disks Floppy Disk Drives Able to access (read) data from and  place (write) data on a floppy disk  any number of times Internal or external Within the device is a read/write head  used to access data on the disk Average access time is ~1/2 a  second A type of magnetic media Uses magnetic patterns to store items Most floppies use both sides of the  disk to store data
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Storage Media - Floppy Disks Floppy Disks Data stored in tracks and sectors Track 
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This note was uploaded on 04/17/2008 for the course BUS ADM 230 taught by Professor Kasum during the Fall '07 term at Wisconsin Milwaukee.

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Chap 7 Storage - Chapter 7 Storage Main Memory Memory Is a...

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