A storage device is
necessary for recording data. One of the most important tasks performed
by computers is storing data. Different types of devices are used to
store data. The data stored is stores in digital forms. There are three
types of data storage, namely primary data storage, secondary storage
devices and tertiary storage devices. The classification of computer
storage devices is made based on the task performed by the device. The
primary storage device is commonly called random access memory,
while the secondary storage device is the hard disk. The tertiary
storage devices are removable mass storage devices. While the amount of
data stored on the primary is less and is volatile in nature, while the
secondary storage device have better storage space and also is non
volatile in nature. Let's see the data storage types
Primary Computer Storage
The primary storage devices for computers are actually a part of the computer's memory. We have previously used the terms like RAM and ROM, but may not have know what they are exactly. They are the Random Access Memory (RAM) and Read Only Memory (ROM).
Random Access Memory
The Random Access Memory is used for storing information temporarily. When the computer is switched off, the information on the RAM is wiped off. The access rate of RAM is much higher. They are more expensive than the other types of primary storage devices.
Read Only Memory
It is used to permanently store data. Data can be stored on ROM, either when the computer is being manufactured or by the computer user. However, the disadvantage of this type of memory is that the data stored on ROM cannot be changed. The access rate necessary to get to the memory is much lesser as compared to the access rate of the RAM. Unlike the RAMs, ROMs are not expensive.
Secondary Computer Storage
Most of the storage devices we are acquainted with, come under this category. They are not a part of the processor. People make use of these devices, so that the storage capacity of the computer can be increased. Like the ROM, the secondary computer storage are also non volatile. The information stored on these devices is retained, even if the computer has been switched off.
Hard Drives
The hard drives are one of the most important of the secondary types of computer data storage devices, the hard drive types. Data is stored on the hard drives in the digital format on the hard drives. In the initial days of the computers, hard disks were like removable mass storage devices. However, with time they started coming as a part of the central processing unit of the computer. However, now there are external hard drives available as well.
Floppy Discs
This is a magnetic storage device, which is set in square plastic shell. They are available in different sizes, like 8 inches, 5 ¼ inches and 3 ½ inches. In the initial days floppy discs were very popular, however, with the advancements they got over shadowed by the other devices.
Compact Discs
Previously compact discs (abbreviated as CD) were used only for recording and storing audio files. Subsequently along with audio, video and other data is also stored on them. These discs can store data for long time. The data is stored on the CDs in optical format. Backup can be stored on the CDs.
Digital Versatile Disc
The format of storing data in the digital versatile discs (DVD) is similar to that of a compact disc. The difference lies in the storage capacity. There is six times more storage space in the DVD's as compared to the CD's. Like the CD's, DVDs are also used as backup device.
Flash Memory
With a lot of research came the flash memory. This storage devices for a computer is similar to the read only memory. However, there is a big difference between the flash memory and the ROM. Data from the flash memory can be erased in a matter of few seconds from the flash drives, which is not the case with the ROM's. At the same time, the data can be changed as per the requirement.
Blu-ray Discs
Blu-rays discs are abbreviated as BD, are used for high-definition video storage. It is often used by gamers. Blu-ray discs are similar to the CD's and DVD's in their looks. It is the memory space which makes all the difference between the CD's, DVD's and BD's. Blu-ray disc is an optical storage device.
USB Flash Drive
The USB flash drives consist of a NAND type flash memory. It has an integrated Universal Serial Bus (USB) interface. They are non-volatile and data can be rewritten on them. They are very small in size, but have very large memory space. There are some of the USB drives, where 1 million erase and write cycles can be carried out. On the other hand, some of them are known to retain data for as long as 10 years.
Memory Cards
Data is stored in digital format on the memory cards. They can be used in various electronic devices from hand held computers, mobile phones, cameras, etc. They are also rewritable. Although they are small in size, they can store a high amount of data.
With the constant advancement in technology, new storage devices are constantly getting added to the storage devices list. Along with the new devices, there is advancement that is being carried out to increase the access rate and the capacity of the data stored.
Primary Computer Storage
The primary storage devices for computers are actually a part of the computer's memory. We have previously used the terms like RAM and ROM, but may not have know what they are exactly. They are the Random Access Memory (RAM) and Read Only Memory (ROM).
Random Access Memory
The Random Access Memory is used for storing information temporarily. When the computer is switched off, the information on the RAM is wiped off. The access rate of RAM is much higher. They are more expensive than the other types of primary storage devices.
Read Only Memory
It is used to permanently store data. Data can be stored on ROM, either when the computer is being manufactured or by the computer user. However, the disadvantage of this type of memory is that the data stored on ROM cannot be changed. The access rate necessary to get to the memory is much lesser as compared to the access rate of the RAM. Unlike the RAMs, ROMs are not expensive.
Secondary Computer Storage
Most of the storage devices we are acquainted with, come under this category. They are not a part of the processor. People make use of these devices, so that the storage capacity of the computer can be increased. Like the ROM, the secondary computer storage are also non volatile. The information stored on these devices is retained, even if the computer has been switched off.
Hard Drives
The hard drives are one of the most important of the secondary types of computer data storage devices, the hard drive types. Data is stored on the hard drives in the digital format on the hard drives. In the initial days of the computers, hard disks were like removable mass storage devices. However, with time they started coming as a part of the central processing unit of the computer. However, now there are external hard drives available as well.
Floppy Discs
This is a magnetic storage device, which is set in square plastic shell. They are available in different sizes, like 8 inches, 5 ¼ inches and 3 ½ inches. In the initial days floppy discs were very popular, however, with the advancements they got over shadowed by the other devices.
Compact Discs
Previously compact discs (abbreviated as CD) were used only for recording and storing audio files. Subsequently along with audio, video and other data is also stored on them. These discs can store data for long time. The data is stored on the CDs in optical format. Backup can be stored on the CDs.
Digital Versatile Disc
The format of storing data in the digital versatile discs (DVD) is similar to that of a compact disc. The difference lies in the storage capacity. There is six times more storage space in the DVD's as compared to the CD's. Like the CD's, DVDs are also used as backup device.
Flash Memory
With a lot of research came the flash memory. This storage devices for a computer is similar to the read only memory. However, there is a big difference between the flash memory and the ROM. Data from the flash memory can be erased in a matter of few seconds from the flash drives, which is not the case with the ROM's. At the same time, the data can be changed as per the requirement.
Blu-ray Discs
Blu-rays discs are abbreviated as BD, are used for high-definition video storage. It is often used by gamers. Blu-ray discs are similar to the CD's and DVD's in their looks. It is the memory space which makes all the difference between the CD's, DVD's and BD's. Blu-ray disc is an optical storage device.
USB Flash Drive
The USB flash drives consist of a NAND type flash memory. It has an integrated Universal Serial Bus (USB) interface. They are non-volatile and data can be rewritten on them. They are very small in size, but have very large memory space. There are some of the USB drives, where 1 million erase and write cycles can be carried out. On the other hand, some of them are known to retain data for as long as 10 years.
Memory Cards
Data is stored in digital format on the memory cards. They can be used in various electronic devices from hand held computers, mobile phones, cameras, etc. They are also rewritable. Although they are small in size, they can store a high amount of data.
With the constant advancement in technology, new storage devices are constantly getting added to the storage devices list. Along with the new devices, there is advancement that is being carried out to increase the access rate and the capacity of the data stored.
Thank to Bhakti Satalkar
Article source: http://www.buzzle.com/articles/computer-storage-devices.html
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