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Backing Storage

Backing Storage. Backing Storage Devices. Backing storage devices allow us to store programs and data so that we can use them later Backing storage devices can be split into 4 categories: Magnetic (Hard Disk Drive) Optical (CD, DVD, Blu-ray) Solid State (Solid State Drive, USB Flash Drive)

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Backing Storage

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  1. Backing Storage

  2. Backing Storage Devices • Backing storage devices allow us to store programs and data so that we can use them later • Backing storage devices can be split into 4 categories: • Magnetic (Hard Disk Drive) • Optical (CD, DVD, Blu-ray) • Solid State (Solid State Drive, USB Flash Drive) • Hybrid (Hard Disk + Solid State Drive)

  3. Hard Disk • Solid disk (made of metal or very hard plastic) • Usually permanently fixed inside the computer (or close by it in its own box) • Large capacity • Data is stored magnetically

  4. Optical Storage (CDs and DVDs) • Data is stored on surface of the CD or DVD in a series of pits • Pits are read by shining laser light onto the surface of the disk. • CDs and DVDs rotate at a very high speed and the laser beam is reflected off the disks surface.

  5. CD-ROM • Data cannot be writtento CD ROM once it has been produced • Data is usually written on a CD-ROM in a factory (where it is being made/produced)

  6. CD-R (Recordable) • Data is written onto the disk using a special disk drive unit. • The unit burns a permanent pattern into the surface of the disk using a high precision laser beam. • CD-R disks can only be written to until the disk is full

  7. CD-RW (Rewriteable) • Data is written and rewritten onto the disk using a special disk drive unit. • The unit uses a high powered laser beam with 3 states • High – used to record data • Medium – used to erase data • Low – used to read the data • CD-RW (CD-Rewritable) disks can be written and rewritten many times

  8. DVD ROM • Stores greater amounts of information than a CD • A DVD can store more information because: • Pits are smaller • Can have two layers on each side and be double sided • DVD-ROM cannot be writtento once it has been produced

  9. DVD-R & DVD -RW • DVD-R and DVD+R (Recordable) • Write once medium • Disk can only be written to until the disk is full • DVD-RW (Rewritable) • Disks can be written and rewritten many times

  10. Blu-ray Disk (BD) • Stores an even greater amount of information than DVDs • A Blu-ray can store more information because: • Pits are even smaller • Can have up to 4 layers on one side • Disk is read by a shorter wavelength blue laser

  11. BD-R and BD-RE • BD-R (Recordable) • Write once medium • Disk can only be written to until the disk is full • BD-RE (Rewritable) • Disks can be written and rewritten many times

  12. Solid State Drive • A solid state drive stores information on memory chips • There are no moving parts which means: • Data can be accessed very quickly • Less power is consumed • More robust than hard disk • More expensive and much smaller capacity than a hard disk drive

  13. USB Flash Drive • USB – Universal Serial Bus • Device used to store data, such as pictures and movie files • USB Flash Driveis a Solid State Device as there are no moving parts

  14. Hybrid Drive • A mixture of a hard disk drive and a solid state drive • Frequently accessed data is stored on the faster to access solid state part • Has large storage capacity advantage of a hard disk, and quick access advantage of a solid state drive

  15. Calculating Storage • How many 3Mb photos would fit on a 4Gb flash card? • How many 50Mb tracks would fit on a CD?

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