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. Methods of Storage Magnetic Flash Optical Digital Storage
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4. Magnetic Storage
Storage device that codes data as microscopic magnetized needles on the disk's surface
The hard disk is the most common magnetic storage device
Storage capacity--terabytes

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.
Examples: flash drives, camera storage cards
Some computers have a solid-state drive instead of the typical magnetic hard drive

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. Compact Disk Standard storage capacity: 650-700 MB Three types:
Digital Storage
Compact Disk
Standard storage capacity: MB
Three types:
CD-ROM—permanent storage (650MB)
CD-R—recordable but cannot be erased (700MB)
CD-RW—recordable but can be changed (700MB)
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8. Digital Storage
Digital Video Disk
Standard storage capacity--4.7GB; there are formats that will hold at least double that
There are three basic types, although others are available:
DVD-ROM—permanent storage, 17GB
DVD±R—recordable, 4.7GB
DVD±RW—recordable, but not erasable, 4.7GB
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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.
Declining in popularity due to the increase in streaming video options
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