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Secondary Storage

Secondary Storage. Chapter 4. Lesson Outcomes. Why I should know about this chapter? Not right secondary storage will make your computer slow, digital camera won’t take pictures and your phone won’t be able to run apps. Lesson Outcomes.

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Secondary Storage

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  1. Secondary Storage Chapter 4

  2. Lesson Outcomes • Why I should know about this chapter? • Not right secondary storage will make your computer slow, digital camera won’t take pictures and your phone won’t be able to run apps.

  3. Lesson Outcomes • At the end of this lesson, the students should be able to: • Differentiate between primary and secondary storage. • Identify the important characteristics of secondary storage including media, capacity, storage devices and access speed. • Describe hard-disk platters, tracks, sectors, cylinders and head crashes. • Compare internal and external hard drives. • Compare performance enhancements including disk caching, RAID, file compression and file decompression. • Define optical storage including compact discs, digital versatile discs and Blu-ray discs. • Define solid-state storage including solid-state drives, flash memory cards and USB drives. • Define cloud storage and cloud storage services. • Describe mass storage, mass storage devices, enterprise storage systems and storage are networks. • Discuss the other types of storage – magnetic stripe card, smart card, RFID tag, microfilm and microfiche • Identify/suggest secondary storage for each category of user

  4. Storage

  5. Storage

  6. Storage

  7. Storage • Important characteristics of secondary storage: • Media – physical material that holds data & programs • Capacity – how much a particular storage medium can hold • Storage devices – hardware that reads data & programs from storage media • Access speed – measures amount of time required by the storage to retrieve data & programs

  8. Storage

  9. Hard Disk • A hard diskcontains one or more inflexible, circular platters that use magnetic particles to store data, instructions and information

  10. Hard Disk • Hard disks use rigid metallic platters that are stacked one on top of another • It stores and organizes files using tracks, sectors and cylinders.

  11. Hard Disk • Hard disks are sensitive instruments. • The clearance between a hard disk read/write head and the platter is about 0.000001 inch thick. • A head crash occurs when a read/write head touches the surface of a platter – resulting in a loss of data or sometimes loss of the entire disk

  12. Hard Disk • There are two basic types of hard disks : • Internal hard disk • Located inside the system unit • Fast access to retrieve large quantities of information • Cannot be easily removed from the system unit • External hard disk • Slower access • Usually connected to a USB or Thunderbolt port on the system unit • Easily removed

  13. Hard Disk • Performance enhancement techniques:

  14. Solid-state Storage • Solid-state memory contains no moving parts • Data and information are stored and retrieved electronically • Types of flash memory storage:

  15. Solid-state Storage Solid–state devices (SSDs) have no moving parts • Solid-state drives • Faster and more durable than hard disks • Access to slash memory or solid state storage • Flash memory cards • Widely used in laptops, smartphones, GPS navigation systems • USB Drives (or Flash Drives) • Connect to USB port • Capacity of 1 GB to 256 GB • Portable

  16. Flash Memory Storage Discovering Computers 2014: Chapter 8

  17. Flash Memory Storage Discovering Computers 2014: Chapter 8

  18. Flash Memory Storage Discovering Computers 2014: Chapter 8

  19. Flash Memory Storage Discovering Computers 2014: Chapter 8

  20. Flash Memory Storage Discovering Computers 2014: Chapter 8

  21. Cloud Storage • Cloud storage is an Internet service that provides storage to computer or mobile device users • Supplied by servers that provide cloud storage or online storage

  22. Cloud Storage • Advantages of cloud storage:

  23. Cloud Storage • Disdvantagesof cloud storage:

  24. Cloud Storage Service Companies

  25. Cloud Storage- Making IT Work for You • Using a cloud storage service makes it easy to upload and share files with anyone. Starting Dropbox Dropbox Sharing Dropbox Step 1 Step 2

  26. Optical Discs • An optical discconsists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser

  27. Optical Discs • Use reflected light to represent data • Lands represent 1s and 0s on the disc • Pits are bumpy areas on the disc that, when light is reflected, determine the 1s and 0s • Use tracks and sectors to organize and store files but only use a single track unlike the hard drive

  28. Optical Discs • Optical discs commonly store items in a single track that spirals from the center of the disc to the edge • Track is divided into evenly sized sectors

  29. Optical Discs

  30. Optical Discs

  31. Optical Discs

  32. Mass Storage Devices • To meet the needs of organizations requiring large amounts of secondary storage requirements • Enterprise storage system • Safe use of data across an organizational network • Devices include: • File servers • Networked attached storage (NAS) • RAID systems • Organizational cloud storage

  33. Enterprise Storage • Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability

  34. Enterprise Storage

  35. Enterprise Storage

  36. Enterprise Storage

  37. Enterprise Storage

  38. Enterprise Storage

  39. Enterprise Storage

  40. Other Types of Storage www.indiamart.com www.innoozest.com

  41. Other Types of Storage www.cardsdc.com

  42. Careers In IT • Disaster recovery specialists are responsible for recovering systems and data after a disaster strokes • General employer requirements • Bachelors or associates degree incomputer science or information systems • Experience in the field and skills in networking, security and DBA • Communication and skills and be able to handle high-sress situations • Annual salary of $70 K to $88 K

  43. A Look to the Future ~ Next Generation Storage • At some point, hard drives will no longer be able to keep up • Looking at ways of increasing capacity without increasing size • Currently hard drive maxes out at 128 GB per square inch. • New technologies may advance this to 6.25 TG (6,250 GB) per square inch.

  44. End of Chapter 4

  45. Open-Ended Questions • Compare primary storage and secondary storage, and discuss the most important characteristics of secondary storage. • Discuss hard disks including density, platters, tracks, sectors, cylinders, head crashes, internal, external, and performance enhancements. • Discuss solid-state storage including solid-state drives, flash memory, and USB drives. • Discuss optical disks including pits, lands, CDs, DVDs, Blu-ray, and hi def. • Discuss cloud computing and cloud storage. • Describe mass storage devices including enterprise storage systems, file servers, network attached storage, RAID systems, organizational cloud storage, and storage area network systems.

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