Storage Devices

Storage Devices 

 devices completion memory is the storage area of the computer it is any kind of hardware with Stowe's data and instructions for the computer they are classified into two types primary or internal memory and secondary or external memory while the primary memory is accessed directly by CP secondary memory is backup memory used for long-term storage of data its key characteristics are it is slower than the primary memory data stored is permanent so it is used for storage and backup it helps in transferring data from one computer to another there are many different types of storage devices such as floppy drive CD drives tapes etc the earliest computer storage device was actually punch card made of paper now we have storage devices which are either magnetic optical or flash memory devices let's look at each one of them magnetic storage devices include hard disks and floppy disks hard disks are typically installed inside the computer though portable hard disks are also available inside the hard disks there is a spindle which holds one or more rotating disks called platters these this are coated with magnetic material these lists have a magnetic head which is used to read or write data on the disk proper tests were used to transfer data between computers the computers have floppy drives into which the floppy was inserted they used 

Storage Devices 

to come in 5 1/4 inch or 3 and a half inch size as their data capacity was very less pendrives have now become more popular next our optical storage devices which includes CDs DVDs and blu-ray discs it uses laser and light to store data seeking stands for compact us they are portable and can store up to 700 MB of data they come in three types first is cd-rom or CD read-only memory from where you can only read data then they are CBR or CD recordable where data can be written on in once and then can be read multiple times in cd-rw or CD rewritable the data can be written multiple times so it is also known as a visible sealing next we will cover DVDs DVDs stand for digital versatile disc and they have storage capacity almost 10 times that of CD and a 20 times faster than CD they come in three type first type is dvd-r or dvd-rw written only once and then can be read multiple times in devotee read/write or DVD rewritable the data can be written multiple times next is blu-ray the name comes from blue laser which reads prom and writes to the disc rather than the red laser of DVD this allows you to store more and it can for 25 gb of data for now there are dual layer triple layer discs which pull even more data now we will cover flash 

Storage Devices 

storage device they include USB flash drives memory cards or SD cards etc they have now become very popular as it is much cheaper efficient and reliable solution USB flash drive or pendrive is a portable memory store device which is the size of a human thumb and connect to computer wire or USB port it can store data up to 1tb it is compact fast and convenient so it is typically used to store and transfer fire memory card is used to store photos videos in cameras smartphones and gaming console they can store images up to 128 GB SD or secure digital card comes in micro SD or mini SD size as well nowadays storing data online and in cloud is becoming popular as people need to access their data from more than one device however it is nothing but touring on a network of remote servers which are either magnetic or optical