CIS 105 Chapt. 4 Notes
CIS 105 Chapt. 4 Notes CIS 105
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This 3 page Class Notes was uploaded by Brigette Maggio on Monday January 4, 2016. The Class Notes belongs to CIS 105 at Arizona State University taught by Wood, McCarthy in Fall 2015. Since its upload, it has received 29 views. For similar materials see Computer Appls&Info Technology in Computer Information Systems at Arizona State University.
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Date Created: 01/04/16
CIS 105 McCarthy Chapter 4 Storage Business Network Options A Financial Services Business (FSB) with 1,500 employees has massive data storage needs. Which option is best? •Buy hardware and IT employees staff and do it themselves. •Employ an offsite mass storage company. •Port their storage into the Cloud. What are the advantages and/or disadvantages of any solution? Computer Storage The variety of ways a computer system stores (saves) data and information which includes: •Spreadsheets •Documents •Graphics •Software Programs Filing Cabinet Storage A steel box, organized with drawers, folders in the drawers, legal contracts in the folders, organized in alphabetical order (secondary storage). To work on a legal contract, find it in the filing cabinet (secondary storage) and put it on your desk (primary storage). Make the desired changes on the contract, and put in back in the appropriate place (saving) in the filing cabinet. In a computer system, a filing cabinet is a hard drive or an optical disc, with advantages and disadvantages. •What if the filing cabinet burns down? •What if I want a copy of a file in the filing cabinet? •What if I want to send a file so someone else? •What if I want someone else to help me with the file? Secondary Storage •Filing Cabinet •Nonvolatile •Retains information even with the computer turned off. •Not directly accessible by the CPU •Must make use of input/output channels. •Slower than primary storage. •Typically higher capacity than primary storage. How can you guarantee that information is removed from a hard drive? Primary Storage •Random Access Memory (RAM) •Volatile (does not retain information when off) •No physical movement •Accessed in any order (speed) Ones and Zeros •Computers are binary, made up of two parts •Two Parts: Positive or Negative charges on a hard drive •Charges are represented by ones and zeros. •Any file on a computer in converted to ones and zeros. •Input devices (like keyboards or microphones) translate what a human understands to ones and zeros for the computer system to use. •Output devices (like computer monitors and printers) translate ones and zeros to what a human understands. A “One” is a bit. A “Zero” is a bit When 8 bits are combined they become a “byte.” Bytes can be used to represent characters: 01000001 =“A” Physical Storage Characteristics •Requires a read/write head •Typically spinning media •Records (write) data and information •Accesses (read) data and information •Electromagnetic, holds positive and negative charges •Like a record player •Concentric circular band around the disk is a track •Divided into pie shapes called sectors •More than one sector comprises a cluster •Table of contents is “FAT” If the Internet is fast, why not connect to a hard drive somewhere else besides your local hard drive? Could you access this hard drive from any computer? Would you have to backup this hard drive? That’s the “Cloud”. Characteristics of Storage Media Media Capacity* Floppy Disk 1.44 Mg Hard Drive 40 GB – 60 Terabytes Flash Memory 256 – 2 Terabytes Digital Versatile Disk 15 GB – 30 GB Blu Ray 25 GB – 30 GB Magnetic Tape Unlimited RAID Unlimited iDrive (pre Cloud) Unlimited Mass Storage Unlimited Cloud Storage Unlimited *Capacities are for reference only and are not accurate and change so quickly, this data is likely outofdate. Business Storage Strategies If a business lost some or all of its data and information, would it continue to exist? Businesses need to carefully consider the following storage strategies: •Capacity: How much data and information needs to be backedup? •Access time: How long does it take to get my data and information back? •Security: Who gets to see my data and information? •Cost: What does it cost to backup my data and information? •Disaster Recovery: If there is a natural disaster, will I still be in business? Cloud Storage: Does this technology render all other backup methodologies useless? Data Archiving & Backup Strategies Archiving data means: when data and information is no longer needed on a daily basis. •Might need to be accessed in the future
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