A ROM is used to store information

Some people think that this is a very simple information, does it need more explanation? But there are people asking the question “a ROM is used for what?”, and it is not uncommon, so I would like to bring a little clarity in regard to this topic.

What is the permanent memory?

A ROM is used for storing data represented in electronic form. There is another, more understandable to the ordinary user of language. A ROM is used to store programs that are used on the electronic devices. Often made in the form of a rectangle, inside of which has the necessary hardware that can support storing a limited amount of data in the supplied DC voltage. In other words, the ROM have the energy independent memory, which stores the necessary data. If a person reads these words, we can conclude that he is already using the ROM, because it uses the appropriate device. If you want to see the device firsthand, it is quite possible to do. Like - depending on the device from which you read this article. If from the computer, remove the cover panel from the system unit and look at the front of the computer. There you can see quite a small size device 20*10*4 centimeter or so (now we are talking about desktop, not laptop, not to be confused). ROM looks like a piece of black plastic, bound on the sides with iron plates.

So, we can say that a ROM is used to store answers to all possible questions, because it preserved all the information that the user stores on his computer. But the more the media will be discussed later.

What are they?

According to the peculiarities of their use it is possible to allocate two kinds of ROMs:

• Portable. This could include those permanent mass storage device, which is useful when moving from one computer or electrical device to another. This can be attributed to the cumulative e-books, flash drives and many other similar functionality for the device.
• Stationary. These devices are designed so that once set will be used. The ROM that is installed in the computer, belongs to this type.

The different persistent storage devices?

Until recently, the main and most significant difference between them was the amount of information that can be recorded. Thus, the main media were magnetic tape and derived from them – a floppy, which had a memory of hundreds and thousands of times smaller than the hard disks of computers. But as time went on, and now portable ROM memory not inferior to stationary, sometimes being modified under the transfer hard drives of the computer. But even now there remained a significant difference:

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• Size. Typically, the portable storage device is still designed for a smaller amount of memory, so quite naturally, they are smaller in size.
• Various connection types to the computer, as well as places of connection: internal and external (outside the system unit and inside it).
• Speed of interaction. It is probably noticed by many readers. If the transfer of files between folders on your computer takes seconds to transfer from the external device into computer memory need minutes.

Portable storage devices

To portable storage devices should include such electronics:

• Cumulative E-book. This permanent memory is used to store huge amounts of data. So, these books in size correspond to the conventional books made of paper, but the amount of data that can be placed on them, is impressive: it's up to 10 Terabytes (such instances are on sale at the time of writing).
• Drives based on laser technology (CD, DVD, etc.). Probably, many can be found a small collection of these vehicles, which were games or movies, and some now, in the era of Internet and free access to information, they buy for the home collection.
• The tape Device (floppy disk, now almost not used).
• Reusable Electronic storage media that is created with application of technology of "flash" ( they are known as stick). A small permanent memory serves for storing data up to several units or tens of gigabytes.

Fixed storage devices

These include:

• Hard drives that are installed in computers.
• Entire informational system of accumulation of information, which can be seen in the huge data centers of accumulation.

Tips when selecting ROM

And now, knowing in General what it is intended for permanent storage, not the superfluous will know which device to choose. But to avoid frustration, one must first understand the system of counting of the data. The fact that such devices operate on a binary system, for which important is the number 1024. It just so happened that 1 Gigabyte is 1024 megabytes, 1 megabyte is 1024 kilobytes, etc. (a topic for another article). And the producers of media sometimes are unfair and are based on the number 1000, rounding the value. You can buy flash media on 16 000 MB and can tell you that is 16 gigabytes, but in reality there will be a total of 14.9 GB. And now to the tips:

• When buying always check whether the indicated value on the drive to the real situation. Ask the seller to check at the set in the store computer. In stores that appreciate customers, such a procedure is provided for in the regulations, so don't worry and feel free to ask.
• Inspect the permanent storage device for external damage. Verification from paragraph 1 here will also be useful.
• Check the quality of the nests. If visible damage, select another item.
• And always remember the buyer's rights in case of purchase of defective goods.

And finally, let us repeat: the permanent storage is used to store what? The data presented in electronic form. Hopefully, after reading this article, any reader will be able to answer this question without any hitches.