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Memory Storage

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Masum Rehman

This document summarizes different types of computer storage devices. It discusses optical storage devices like CDs, DVDs, and Blu-ray discs, noting their capacities and advantages like portability but also disadvantages like fragility. Magnetic storage devices discussed include floppy disks, which are now obsolete, as well as hard disk drives (HDDs) which continue to increase in capacity. HDDs provide large storage at a low cost per MB but can fail physically. Flash memory devices like USB flash drives are also summarized, providing portability but at a higher cost per MB and limited read/write cycles.

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PRESENTATION BY Md.Masumer Rahman ID:151-15-5040 COMPUTER STORAGE
Storage Storage any devices that are capable of holding information, even when the power is off (non-volatile). Ex: Floppy disk drive, hard disk drive, USB flash disk,... Offline storage type of storage that can be removed and can be accessed from any computers when connected.
Types of storage device Optical storage devices Magnetic storage devices Flash memory devices
Optical storage devices Compact Disc (CD) Capacity: 700 MB Available from 1982 Blu-ray Disc Capacity: 25 GB Available from 2006 DVD Capacity: 4.7 GB Available from 1995
Optical storage devices Advantages: Small and portable Cheap to produce Large market of music, movies and games Most desktop computers or laptops are equipped with CD/DVD/Blu-ray drive Disadvantages: x Fragile, easy to get scratched x Slower data transferring rate x Required specified drives to write data to the discs x Limited number of writes
Magnetic storage devices Floppy disk First available in 1971 Capacity: 1.44 MB (3 12-inch floppy disk) Discontinued. Since 2010, no motherboard is still manufactured with the support of floppy disk drive.
Magnetic storage devices Hard disk drive (HDD) First introduced in 1956 Became dominant in the 1960s Capacity keeps increasing Max. capacity: 4 TB (as of 2013) Continuously improved. Maintained an important position of modern servers and PCs.
Magnetic storage devices Advantages (HDD): Large and increasing capacity High transferring speed No data loss when power is off (non-volatile) Cheap price compared to other storage media (cost per MB) Disadvantages (HDD): x Possible damages and data loss due to head crash x Because of working on mechanism basis, it will be eventually broken x In case of internal hard drive, it is not easy to be transferred to another computer x High power consumption
Flash memory devices USB Flash drive Commercially available in 2000 Max. capacity: 1 TB (as of 2013) Small size Ideal solution for storing small data
Flash memory devices Advantages: Large and increasing capacity High transferring speed Small size, portability Low power consumption Work more quietly than physical hard drive Disadvantages: x High price compared to hard disks (cost per MB) x Limited number of reads/writes (write endurance rating) x Easy to lose because of small size
Thank you YO U D I D N T H E A R T H AT ?

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Memory Storage

  • 2. Storage Storage any devices that are capable of holding information, even when the power is off (non-volatile). Ex: Floppy disk drive, hard disk drive, USB flash disk,... Offline storage type of storage that can be removed and can be accessed from any computers when connected.
  • 3. Types of storage device Optical storage devices Magnetic storage devices Flash memory devices
  • 4. Optical storage devices Compact Disc (CD) Capacity: 700 MB Available from 1982 Blu-ray Disc Capacity: 25 GB Available from 2006 DVD Capacity: 4.7 GB Available from 1995
  • 5. Optical storage devices Advantages: Small and portable Cheap to produce Large market of music, movies and games Most desktop computers or laptops are equipped with CD/DVD/Blu-ray drive Disadvantages: x Fragile, easy to get scratched x Slower data transferring rate x Required specified drives to write data to the discs x Limited number of writes
  • 6. Magnetic storage devices Floppy disk First available in 1971 Capacity: 1.44 MB (3 12-inch floppy disk) Discontinued. Since 2010, no motherboard is still manufactured with the support of floppy disk drive.
  • 7. Magnetic storage devices Hard disk drive (HDD) First introduced in 1956 Became dominant in the 1960s Capacity keeps increasing Max. capacity: 4 TB (as of 2013) Continuously improved. Maintained an important position of modern servers and PCs.
  • 8. Magnetic storage devices Advantages (HDD): Large and increasing capacity High transferring speed No data loss when power is off (non-volatile) Cheap price compared to other storage media (cost per MB) Disadvantages (HDD): x Possible damages and data loss due to head crash x Because of working on mechanism basis, it will be eventually broken x In case of internal hard drive, it is not easy to be transferred to another computer x High power consumption
  • 9. Flash memory devices USB Flash drive Commercially available in 2000 Max. capacity: 1 TB (as of 2013) Small size Ideal solution for storing small data
  • 10. Flash memory devices Advantages: Large and increasing capacity High transferring speed Small size, portability Low power consumption Work more quietly than physical hard drive Disadvantages: x High price compared to hard disks (cost per MB) x Limited number of reads/writes (write endurance rating) x Easy to lose because of small size
  • 11. Thank you YO U D I D N T H E A R T H AT ?