Digital storage
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Digital Storage. Measuring Memory and Storage. Methods of Storage . Magnetic Flash Optical. Magnetic Storage. Storage device that encodes data as microscopic magnetized needles on the disk's surface Hard disk Tape. Flash Storage.

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Presentation Transcript
Digital storage

DigitalStorage



Methods of storage
Methods of Storage

  • Magnetic

  • Flash

  • Optical


Magnetic storage
Magnetic Storage

  • Storage device that encodes data as microscopic magnetized needles on the disk's surface

    • Hard disk

    • Tape


Flash storage
Flash Storage

A type of constantly-powered memory that can be erased and reprogrammed in a single action or “flash.”

Described as “solid-state” memory because there are no mechanical (moving) parts.

Also known as a pen drive, thumb drive, jump drive.

Storage cards for digital cameras use flash memory.


Optical storage
Optical Storage

  • Storage device that records data by burning microscopic holes in the surface of the disk with a laser

    • Compact disks

    • Digital video disks

    • Blu-ray disks


Compact disk
Compact Disk

  • CD-ROM: stores information permanently; cannot be changed; typical media used for software ; 650MB capacity

  • CD-R: recordable; can record multiple times but cannot be erased or overwritten; 650-700 MB capacity

  • CD-RW: rewritable; can store, erase, and replace data information like a floppy disk or hard drive; 700 MB capacity is typical.


Digital video disk
Digital Video Disk

  • DVD-ROM—typical storage capacity 17GB; permanent storage

  • DVD-R, DVD+R, DVD±R—recordable, can record multiple times but cannot be erased or overwritten; 4.7 GB capacity

  • DVD-RW, DVD+RW, DVD±RW—can store, erase, and replace datainformation like a floppy disk or hard drive; 4.7 GB capacity is typical.


Blu ray disk
Blu-ray Disk

  • High capacity optical disk that has a storage capacity of 25GB.

  • Has recordable and rewritable disks just like CDs and DVDs.

    How Blu-ray Discs Work


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