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| Secondary Storage |
Secondary Storage
when there is no power to the computer. Frequently used programs are stored in secondary
memory and loaded into main memory as needed. Important information, such as word processing documents, payroll data, and inventory figures, is saved to secondary
storage as well.
The most common type of secondary storage device is the disk drive. A disk drive stores data
by magnetically encoding it onto a circular disk. Most computers have a disk drive mounted
inside their case. External disk drives, which connect to one of the computer’s communication
ports, are also available. External disk drives can be used to create backup copies of
important data or to move data to another computer.
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hard drive |
In addition to external disk drives, many types of devices have been created for copying data
and for moving it to other computers. For many years floppy disk drives were popular. A
floppy disk drive records data onto a small, flexible (“floppy”) disk, which can be removed
from the drive. The use of floppy disk drives has declined dramatically in recent years, in
favor of superior devices such as USB flash drives. USB flash drives are small devices that
plug into the computer’s USB (universal serial bus) port and appear to the system as a disk
drive. These drives, which use flash memory to store data, are inexpensive, reliable, and
small enough to be carried in your pocket.
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| external disk drives |
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