Definition: External memory is a type of data storage device for a computer that is kept outside of the computer in its own casing and the memory used by the CPU for data and program storage purposes in the amount of volume. Example: Hard Disk, Magnetic Tape, CD-ROM.
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| External Hard Disk |
Properties:
- External memory is also called Secondary-Memory has a relatively large size of the volume, as great as Tera Byte (TB), is used as a "storage" or storage of data and programs.
- Programs and data are stored normally in a dormant state, for example in the form of compressed, or programs that have not been installed.
- Having the data access speed is relatively slow when compared with Random Access Memory.
Types of External Memory
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Semiconductor memory is an electronic data storage device, often used as computer memory, implemented on semiconductor-based intregated circuit.
Flash Memory
Example: ROM, EEPROM, FLASH Memory.
- Magnetic Memory is A system of storing information through the alignment of small grains in a magnetic material. Once the grains have been aligned by an external magnetic field the information remains stored for long periods of time.
- Shaped Magnetic-Disk
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| Disket |
- Hard Disk
- RAID(Redudant Array of Independent Disk)
- Disket
- Shaped Magnetic-Tape
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| Tape BackUp |
- Tape BackUp
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