1. Digital Storage
Digital Storage
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2. Measuring Memory and Storage
Digital Storage
Measuring Memory and Storage
Term
Abbreviation
Approximate Memory Size
Kilobyte
KB or K
=1000 bytes (actual size is 1024 bytes)
Megabyte MB
=1 million bytes
Gigabyte GB
=1 billion bytes
Terabyte TB
=1 trillion bytes
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3. Magnetic Flash Optical Methods of Storage Digital Storage
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4. Magnetic Storage
Storage device that encodes data as microscopic magnetized needles on the disk's surface
The hard disk is the most common magnetic storage device

5. 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.

6. 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

7. Digital Storage
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; MB capacity
CD-RW: rewritable; can store, erase, and replace data information like a floppy disk or hard drive; 700 MB capacity is typical.
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8. Digital Storage
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 data information like a floppy disk or hard drive; 4.7 GB capacity is typical.
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9. Digital Storage
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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