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L03 slides


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  • Pg 11Objective 1-1.1.4Discuss how disk drives work. The concept will work the same for a flash drive or DVD even though it may not be as obvious to visualize with a flash drive. You may want to allude toor, if available, show how some flash drives provide a screen asking how the flash drive will be used, and if indicated for storage only, will prepare (format) that flash drive for that purpose.You might also want to provide a screen of how the sectors appear on a typical disk drive, and then discuss how data is saved, given that the disk is continuously spinning until the save command is recognized.
  • Pg 13-14Objective 1-1.1.4How much discussion you have with students regarding how disk drives are set up on a server should be determined by the interest of the students. Most people will not need this information, although you can allude to the fact that Microsoft has a number of certifications that target this type of information for those students who may want more information for how computers or networks are set up.Provide examples of how remote or virtual storage systems can be advantageous to someone, e.g., obtaining e-mail from any locale, sharing data with others such as pictures of family reunions or events, etc.
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    • 1. Lesson 3: Working with Storage Systems • storage systems • hard disk drives • optical drives • portable or removable storage devices • network drives • remote storage© CCI Learning Solutions Inc. 1
    • 2. What Are Storage Systems? • RAM is temporary so you must save work to storage device • Storage device you use depends on amount of storage you need and speed of data retrieval or data transfer rate • Hard disk drives used most often to store and retrieve software programs and data • Can use other media such as flash drive or optical disc for backup or portability purposes© CCI Learning Solutions Inc. 2
    • 3. Working with Disk Drives • Disk drive performs three functions: − Rotates disk at constant speed to access sectors on entire disk surface − Moves read/write head across tracks on entire disk surface − Reads data from disk and writes data to disk using read/write head • Data from RAM written on disk arranged in tracks divided in sectors • Process of preparing disk for use is called formatting − Places special information on each track that marks location of each sector© CCI Learning Solutions Inc. 3
    • 4. Working with Hard Disk Drives • Primary storage area for both data and programs − Software programs must be installed on hard drive − Hard drive stores and retrieves information at high speeds • Data transfer rate (throughput) of hard drive is function of hard drive rotation speed and number of heads per surface − The higher the rotation speed and/or number of heads, the less time it takes to find data − Range in capacity from 100 MB to 100+ GB − Also used in network servers where drives very large to accommodate requirements of whole organization and data storage requirements − Data transfer rate quite fast although can be restricted by type of network interface cards and number of users or tasks to be processed© CCI Learning Solutions Inc. 4
    • 5. Working with Optical Drives • Designed to read flat, circular disc, commonly referred to as Compact Disc (CD) or Digital Versatile/Video Disc (DVD) − Read by laser device or optical drive that spins disc at speeds from 200 rpm or higher • CD-ROM (Compact Disc Read Only Memory) or DVD-ROM drive − Similar to player in audio/video entertainment system − Information written or burned onto surface and retrieved with laser beam − Can only read data • New computers come with at least one optical drive − Usually DVD optical drive or CD/DVD optical writer drive.© CCI Learning Solutions Inc. 5
    • 6. Optical Writers • Also known as burner drive, looks and acts like regular optical disc drive − Software comes with optical writer drive to “burn” or write data onto a disc • Formats of drives include: − CD-R/ DVD-R: can write once only to blank disc, but disc can be read multiple times − CD-RW/ DVD-RW: can read and write multiple times onto same disc − DVD-RAM: similar to DVD-RW but can only be used on devices that support this format; usually in the form of cartridges • Blank discs relatively inexpensive, with -R disks cheaper than -RW • Size of disc can be 650 or 700 MB, while DVDs can be 4.7GB to 17+GB with rapid access speeds • Special software needed to manipulate or edit video before burned to DVD© CCI Learning Solutions Inc. 6
    • 7. Using Other Types of Storage Devices • Tape drive or tape streamer uses cartridge with magnetic tape − Generally used to back up large amount of data − Use different formats, with tape sizes ranging from 250MB to over 80GB − Other tape drives use Digital Audio Tape (DAT) format • Zip drive similar to DVD-RAM drive except that disk can hold between 100MB and 750MB data − Offers relatively inexpensive storage option − Newer systems not compatible with original 100MB devices • Removable media systems can include flash memory cards, sticks or USB flash key/thumb drives, or external hard drives − Benefits include portability, large storage size, and data-sharing capability© CCI Learning Solutions Inc. 7
    • 8. Using Other Types of Storage Devices • Hard drives in network server similar to hard disk drives in computer − Traditionally much larger than available with desktop computer − May be set as disk array, as drives usually organized to work together • Remote or virtual storage systems do not exist on your computer or location − Common service provided by Internet Service Providers (ISP) − Drives on network or dedicated server at particular site − Must login to with secure ID and password to access information − Very useful for off-site backup storage of data, or as “central system” for people in multiple locations to share information − Disadvantage can be speed of Internet connection© CCI Learning Solutions Inc. 8
    • 9. Lesson Summary • storage systems • hard disk drives • optical drives • portable or removable storage devices • network drives • remote storage© CCI Learning Solutions Inc. 9