Secondary Memory
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However, these days, there is secondary
storage devices like SSD which support very fast data transfer speed as compared
to earlier HDDs. Also, data transfers between computers have become easier and
simple due to the availability of small-sized and portable flash or pen drives.
Secondary Memory is also called “storage
device” and “auxiliary memory“, “external memory“. Secondary storage devices
are volatile in nature, it means that data does not discard while power
turn-off, in which all data store for long time. Secondary memory has the speed
of access of data is very slow compare to primary memory, and cheaper as well.
Without primary memory, those secondary storage devices are useless because for
processing the secondary memory must be needed the primary memory, first of all
data are transferred into primary memory then these data make for executable.
Types of Secondary Memory
Secondary memory (Storage Devices) can be
used in computer either internally or externally. Secondary Storage devices
(memory) have four examples like as
- Magnetic Storage Devices
- Flash Memory Devices
- Optical Storage Devices
- Online cloud system
Magnetic Storage Devices
In the Magnetic storage devices, all data
are stored with using magnetized medium, and those types of data saved in that
medium in the binary form like as 0 and 1. This magnetic storage has also
non-volatile storage nature. Today’s, mostly people are preferred to magnetic
medium because on the magnetic storage devices can be performed read/write
activities very easily. Magnetic storage devices have huge capacities for
storing data that it’s more attractive point. These storage devices are not
more costly but their data accessing power is slow, but this magnetic mechanism
also to be used in the RAM that have good data accessing power to other.
Examples Are:
Floppy diskette
Hard drive
Magnetic strip
Super Disk
Tape cassette
Zip diskette
Optical Storage Devices
In the optical storage devices, all read
and write activities are performed by light. All recording information stores
at an optical disk. As per the opinions of data scientist that compact space is
most useful for huge data storage. Their big advantages are not more costly,
light weight, and easy to transport because it is removable device unlike hard
drive.
Examples Are:
Blu-ray disc
CD-ROM disc
CD-R and CD-RW disc.
DVD-R, DVD+R, DVD-RW, and DVD+RW disc.
Flash Memory Devices
Flash Memory was introduced by Dr. Fujio
Masuoka in 1980. Flash memory is also known as electronically erasable
programmable read only memory (EEPROM), because in which piece of code like as programming can be write and
erased by electrically. Flash memory also uses for the storing data to
computers as well as electronic devices such as USB flash drives, MP3 players,
digital cameras and solid-state drives. Flash memory is non volatile in nature
because all data are persisted in the memory when power is turn-off.
Examples Are:
USB flash drive, jump drive, or thumb
drive.
CF (Compact Flash)
M.2
Memory card
MMC
NVMe
SDHC Card
Smart Media Card
Sony Memory Stick
SD card
SSD
xD-Picture Card
Online Cloud System
Clouding is systematically model for
storing data in computer, and in which entire data are stored in logically
nature. Those clouding system are managed by other hosting companies. With the
help of online clouding, all data can be access by couples of users anytime and
anywhere. Big advantages are not place limitation as well as no need carry any
storage device.
There are some types:
Cloud storage
Network media