RAM ensures the normal functioning of a personal computer, as well as the rapid execution of programs and tasks. How many tasks a user can simultaneously perform on his computer depends on its volume. There are some elements in the computer that are also equipped with memory. Consider what is a buffer (or cache) memory, what are its tasks, advantages and how to calculate the required amount.
What is buffer memory?
Cache is a zone for temporary storage of data. It stores information that has been read from the hard disk but not yet transferred for further processing. The need for such storage arose as a result of identifying a large difference between the period for which data is read and the system capacity.
Other PC elements also have a kind of buffer. For example, a printer that can proceed to the next task, but at the same time print the material that was set earlier. Video cards, network cards, etc. also have buffer memory.
The main technical features of the cache are its capacity and speed. Modern devices by such temporal characteristics, as well as the volume of the buffer are significantly different from each other. The larger the cache, the more information is placed in it. This means that the computer can produce results without resorting to the hard drive often.
Thus, the performance of the system increases, and the hard drive’s life is indirectly extended. The latter depends directly on the user and how and why he uses the hard drive. For example, the Winchester will last longer if you watch movies in a browser, and not download through a torrent and open it using a video player.
Cache volumes
When choosing a personal computer, it is important to pay attention to such an indicator as the amount of buffer memory. Since it periodically needs to be rebooted and cleared, the larger the cache will be, the better. Modern user agents are equipped with 8, 16, 32 and 64 MB, but buffers have a capacity of 128 and 256 MB.
Although modern laptops and computers are often equipped with larger cache sizes, smaller ones are rare. When choosing a device, users rarely pay attention to this indicator, since it does not directly depend on price. Also, the parameter is not the key when choosing a computer. Here you need to pay attention to other indicators, since usually the system’s own memory is enough to perform operations.
Cache Types
The buffer memory, which is located in one fixed location, is called a direct mapping cache. If it is located anywhere, then it is called a fully associative memory. In this case, the buffer volume is fully used, data can be deleted after full filling, but the search for information is rather difficult.
A compromise option is a multiple or partially associative cache. In this case, the buffer lines are combined into groups. At the same time, a block that corresponds to a specific group can be placed on any line, and the corresponding value is placed in the tag. A kind of associativity principle operates here, but a certain block falls only into one or another group. This is somewhat similar to the direct mapping buffer.
Multiple associative type of buffer memory on the disk is the most common, as it has high speed and good memory utilization. But at the same time, the direct mapping cache, which is cheap and simple, is only slightly inferior in its characteristics.
the main task
The buffer memory is intended for temporary storage and reading of information. But this indicator is not the main one in determining the efficiency of the hard drive. The algorithm for exchanging data with the buffer is also important, as well as how well work is being done to prevent errors.
The buffer storage contains information that is used most often. Productivity in this case increases several times, since it is loaded directly from the cache. There is no direct access to the hard drive and its sectors, since there is no need for physical reading. This process is quite lengthy, although it is measured in milliseconds, but data from the buffer can be obtained many times faster.
Benefits
Despite the fact that the main advantage of buffer memory is its fast data processing, there are other advantages. A hard disk with a volume buffer can offload the processor or use it minimally. Thus, the computer will not be overloaded and will last longer.
Also, the cache is a kind of accelerator that provides efficient and fast operation of the entire system. This reduces software startup time when data that is already in the cache is required.
For an ordinary user, 32 or 64 MB is enough for work. Larger size loses significance, because when interacting with large files, this difference is insignificant. In addition, someone is unlikely to want to overpay for a larger buffer.
How to find out the amount of buffer memory on your hard drive?
Not every user is interested in such a feature as the cache size (as opposed to the size of the hard drive). Usually the information is on the packaging of the device. You can also find data online or use the HD Tune program, which is free.
It is designed to reliably delete data, assess the state of the device, and also to scan and correct errors in the system. Additionally, through it you can get information about the hard drive.
To find out the amount of buffer memory in MB, you need to download the HD Tune utility and run it. Next, in the “Information” tab, you need to find a line called “buffer”, which will show how much cache is installed in this device.
Experts note that for a regular PC user, a size of 128 MB is suitable. If the computer is used mainly for games, you should focus on the larger cache size.