memory and storage - power storage devices
Requirements for secondary storage computers using primary storage such as random access memory (RAM)
And cache to save the data being processed.
However, this type of memory is unstable
It loses content when the computer is turned off.
PCs for general use such as PCs and tablets need to be able to store programs and data for later use. curriculum-key-
FactSecondary ARY storage is required in order to keep programs and data for a long time.
Non-secondary storagevolatile, long-term storage.
If there is no secondary storage, all programs and data will be lost when the computer is down.
There are three main types of auxiliary storage in computer systems: solid-state storage devices such as CD, DVD and Blu-
Not all computers, however, need secondary storage.
Embedded computers, such as computers in washing machines or central heating systems, do not need to store data when power is turned off.
The instructions needed to run them are stored in read-only memory (ROM)
Any user data is saved in RAM.
Solid State Storage is a special type of storage made of silicon chips.
It can be written and overwritten like RAM.
Unlike RAM, however, it is not
Volatile, which means that solid state storage will retain its contents when the computer is powered off.
Solid state is also used as external auxiliary storage such as USB memory sticks and solid state drives.
One of the main benefits of solid state storage is that there are no moving parts.
Because of this, it is more portable and generates less heat than traditional magnetic storage devices.
The reduction in heat means that the assembly lasts longer. curriculum-key-
FactSolid state storage has no moving parts, so it is more portable and durable.
Solid-state storage is also faster than traditional hard drives because data is electrically stored in silicon chips called batteries.
In the unit, binary data is stored by holding current in a transistor with on/off mode.
Unlike RAM using similar technologies, solid-state storage retains this even if power is turned off using a technology called flash memory.
Solid state is an ideal storage medium for many modern devices such as tablets, smartphones and digital cameras.
Magnetic devices such as disk drives use magnetic fields to magnetized tiny parts of the metal rotary disk.
Each short paragraph represents one.
The magnetized part indicates the binary "1" and the demagnetized part indicates the binary "0 ".
These parts are very small, and the disk can contain tb (TB)of data.
When the disk rotates, the read/write head moves on its surface.
To write the data, the head magnetized or demagnetized the part of the disk that rotates under it.
In order to read the data, the head notes whether the section is magnetized or not.
The magnetic equipment is quite cheap, large in capacity and durable.
However, they are vulnerable if dropped.
They are also susceptible to magnetic fields.
A powerful magnet may clear the data held by the device.
Optical devices use a laser to scan the surface of a rotating disk made of metal and plastic.
The surface of the disk is divided into tracks, each containing many flat areas and dents.
The flat area is called the land, and the sunken area is called the pit.
When the laser shines on the surface of the disk, the land reflects the light back, and the pit will scatter the laser beam.
The sensor looks for the reflected light.
Light reflectedland -
Indicates binary "1" with no reflection-pits -
Represents binary "0 ".
There are different types of optical media: ROM media have data pre-Write on it
Data cannot be overwritten.
Music, movies, software and games are often distributed in this way. Read (R)
Media blank
The optical devices write data to them by shining the laser onto the disc.
The laser burns out the pit that represents '0.
The media can only write once, but it can be read many times.
Copies of data usually use these media.
Read/write RW works the same way as R, just the disc can be written multiple times.
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