What does the higher the hard disk cache, the more it does? Is it better to have as much cache capac

Cache is equivalent to the waiting hall of the station, why it's good to think for yourself I don't need to say more.

The higher you read, the faster you can write. For example, after finishing the game, if your hard disk cache is high, the read speed will be faster.

Cache; The English name is cache, which is also a type of memory, and its data exchange speed is fast and the operation frequency is high.

In the early days, the CPU speed was not fast, and the speed of the memory could fully meet the needs of the system. However, as the speed of the CPU continues to increase, the speed of the memory has improved slowly, which has become a bottleneck of the system. That's where Cache was born, which is faster than the main memory and acts as a buffer area for the CPU and memory, effectively improving the performance of the system.

Caches are further divided into L1 caches and L1 L1 (L1 caches).

L2 (L2 cache).

The first-level cache is mainly used to store the instructions and ** of the CPU, its capacity is relatively fixed, after reaching the required value, if the capacity is increased, its performance will not be improved, and the L1cache of different CPUs is different; l2cache is mainly used to store the instructions of the operating system when the computer is running. The capacity and speed of program data, address pointers, and other data have a great impact on the performance of the system. The larger the capacity, the faster the speed and the faster the system.

The cache of the hard disk is the place where the hard disk and the external bus exchange data, and the reading and writing process of the hard disk is converted into an electrical signal by the magnetic signal, and then filled and emptied again and again through the cache, and then transmitted step by step according to the PCI bus cycle, so the capacity and speed of the cache are directly related to the transmission speed of the hard disk. It has a capacity of 8MB and 16MB

The higher the cache, the higher the transfer rate of the drive.

To put it more intuitively, the cache of the hard disk is like the memory between the CPU and the hard disk, the larger the memory of the machine, the faster the turnover, and the larger the cache of the hard disk, the faster it will read and write.

Not good. Due to the limitations of caching mechanisms and algorithms, if the hard disk uses a cache with a larger capacity, the performance will not be improved, but may reduce the hit rate of the hard disk reading data, resulting in an unstable read speed of the hard disk.

In addition, the speed of exchanging data between high and low speeds is not so obvious when the cache capacity is large.

In addition, large-capacity caching will also bring security risks, in the event of a sudden power failure, a large amount of data in the cache cannot be fully written to the hard disk, resulting in partial data loss.

Hard disk caching can not only speed up the read and write speed of the hard disk, but also protect the hard disk to a certain extent.

When a large amount of fragmented data needs to be exchanged, the cache can act as a temporary storage, reducing hard drive seek and mechanical wear, thereby reducing noise and extending the life of the hard drive.

Disk cache, also known as disk cache, is actually to save the data in the memory space allocated by the system for the software (this memory space is called the "memory pool"), and when the data saved to the memory pool reaches a certain level, the data will be saved to the hard disk. So is it better to have a bigger or smaller hard disk cache?

1. The larger the hard disk cache, the better.

2. Hard disk cache, in fact, is to save the data to the hard disk in the memory space allocated by the system for the software, when the data saved to this memory reaches a certain level (this is the size of your hard disk cache, the larger the cache can save more data at a time.) This data is then saved to the hard disk, which reduces the number of actual operations on the hard disk. Effectively protect the hard drive from damage caused by repetitive read and write operations.

3. The function of the hard disk cache: write buffer: when we write data to the hard disk, we do not write it directly to the hard disk, but write it to the hard disk cache first, wait for the hard disk to be free, and then write the data to the hard disk completely.

The benefit of this is to improve the response speed of the hard drive, reduce the seek time of the hard drive, and extend the life of the hard drive.

4. Pre-read: If the hard disk is idle, the last read data will be read into the hard disk cache in advance, when the system reads this data, it can respond quickly and reduce the seek time.

5. Read buffer: Whether it is reading data or writing data, keep a copy of the data in the hard disk cache, and delete the earliest copy until the hard disk cache is full. The advantage of this is that the application tends to read and write to a file frequently, so that the read and write can be done in the cache without having to access the hard disk, which greatly improves the speed.

The above is an introduction to whether a larger or smaller hard disk cache is better.

It's not that bigger is better, generally cached at 64,128, no matter how big it is, it's not good. The disk above the 256 cache is generally a shingled mechanical hard disk, and the performance is not as good as the vertical type, and the capacity of a single disk of the hard disk is generally around, which is vertical. The shingled type may use two discs and has a larger capacity.

But the performance is not as good as that of the vertical type.

Hard disk cache is to solve the problem of the difference between the processing speed of the CPU and the transfer speed of the hard disk, so the hard disk cache is very good.

The bigger the cache is not necessarily the better, the home recommends 64M cache will do. 128M or 256M cached hard disks are used for monitoring disks or network storage. Caching is the process by which the hard disk stores data in the cache and reads it to the hard disk. As long as the household is stable.

The cache is not as big as possible, and it is not as small as possible, because the function of the cache is to buffer data, that is, when the physical characteristics of the hard disk itself cause the read and write speed to be too slow, a certain amount of data can be written to the cache in advance, and the data in the cache can be retrieved at the right time, and it can speed up the read and write speed in terms of time.

Therefore, if the cache is too small, it will not be able to buffer much data, and it will definitely not have much speed.

On the contrary, it is not necessary for the cache to be large to a certain extent, because the buffered data must be used for a certain period of time, and a large amount of cached data that is not used is meaningless, which increases the risk of data loss.

However, there is no problem of selling too much on the market, and manufacturers will not be stupid enough to waste this resource and increase costs, so from the perspective of purchase, the bigger the better.

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