Please enable JavaScript.
Coggle requires JavaScript to display documents.
STORAGE DEVICES AND MEDIA (Definitions (Example, STORAGE MEDIUM:is any…
STORAGE DEVICES AND MEDIA
Backup
What is data backup?
A copy of a file or other item of data made in case the original is lost or damaged.
Why data backup?
Original data could be loss of storage device
Data could be lost due to the original storage device
Hackers could access the data
Original data can be accidentally copied or deleted
Original data device could be destroyed
Definitions
STORAGE MEDIUM:
is any technology (including devices and materials) used to place, keep, and retrieve data.
STORAGE:
the retention of retrievable data on a computer or other electronic system.
STORAGE DEVICES:
a piece of computer equipment on which information can be stored.
Example
Types of ACCESS
SERIAL/SEQUENTIAL
is that a group of elements (such as data in a memory array or a disk file or on magnetic tape data storage) is accessed in a predetermined, ordered sequence.
DIRECT/RANDOM
the facility of retrieving data immediately from any part of a computer file, without having to read the file from the beginning.
Binary system
A system in which information can be expressed by combinations of the digits 0 and 1.
Bytes
is a unit of digital information that most commonly consists of eight bits.
Megabyte
: Image result for megabyte
The megabyte is a multiple of the unit byte for digital information
Terabyte
:a unit of information equal to one million million (1012) or, strictly, 240 bytes.
Gigabyte
:a unit of information equal to one thousand million (109) or, strictly, 230 bytes.
Kilobyte
: a unit of memory or data equal to 1,024 bytes.
Bit
A bit (short for binary digit) is the smallest unit of data in a computer. A bit has a single binary value, either 0 or 1. Although computers usually provide instructions that can test and manipulate bits, they generally are designed to store data and execute instructions in bit multiples called
bytes
.
#
