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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Digital Storage

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Digital storage

DigitalStorage


Measuring memory and storage

Measuring Memory and Storage


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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