Digital Storage Measuring Memory and Storage Term Abbreviation
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
Methods of Storage l. Magnetic l. Flash l. Optical
Magnetic Storage l Storage device that encodes data as microscopic magnetized needles on the disk's surface ¡ The hard disk is the most common magnetic storage device
Flash Storage l. A type of constantly-powered memory that can be erased and reprogrammed in a single action or “flash. ” l. 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 l. 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 l CD-ROM: stores information permanently; cannot be changed; typical media used for software ; 650 MB capacity l CD-R: recordable; can record multiple times but cannot be erased or overwritten; 650 -700 MB capacity l 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 l DVD-ROM—typical storage capacity 17 GB; permanent storage l DVD-R, DVD+R, DVD±R—recordable, can record multiple times but cannot be erased or overwritten; 4. 7 GB capacity l 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.
Blu-ray Disk l. High capacity optical disk that has a storage capacity of 25 GB. l. Has recordable and rewritable disks just like CDs and DVDs. How Blu-ray Discs Work
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