storage - power storage devices
Common types of secondary storage devices there are generally three types of secondary storage devices: magnetic storage devices such as hard disk drive optical storage devices such as CD, DVD and Blu-
Ray discssolid solid state storage devices such as solid state drives and USB memorykey-
FactData is stored on secondary storage devices in binary form.
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.
Reflected light (lands)
Indicates a binary "1" with no reflection (pits)
Represents binary "0 ".
There are also 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.
R media is 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.
RW works in a similar way to R, but the disc can be written multiple times.
Solid State equipment using non-solid state equipment
Random access memory Volatile (RAM)
Unlimited storage of data.
They tend to have a much faster access time than other types of devices, and are more durable because they don't have moving parts.
Because this type of memory is expensive, the capacity of solid state devices is often smaller than other types.
Solid, for example-
A State drive with a capacity of 256 GB may be similar to the cost of a hard drive with a capacity of several tb.
Solid state devices require very little power, which makes them ideal for portable devices that take into account battery life.
They are also portable due to their small size and durability.