The speed of the hard disk should be so!

Xiao Bian discovered that his computer was very hot today. Later, he discovered that the system's inexplicable occupancy rate was too high. After checking, he discovered that this was a hard drive. Resolved after dealing with their own computers, many people still know the hard disk in the most simple parameters, mechanical hard drive to see the speed, SSD read and write speed. However, the performance of the hard disk is not such a simple two parameters. Today, Xiao Bian put it to explain.

Performance is also good to look at 4K

This 4K is not the 4K of the monitor resolution, but the 4KB ability to read and write files at random. Whether it is a mechanical hard disk or a solid-state hard disk, 4K is one of the most fundamental signs that determine the performance of a hard disk!

Let's talk about SSDs first. Don't look at a lot of products that read and write xxx MB/S at a time. Running around to see the 4K is terrible. When you actually use them, you can read and write speeds in addition to large files like movies. For example, if you play a game platter, 4K read and write performance hard drives are not enough to see. Of course, serious brand products, especially those using TLC's large-capacity SSDs, have excellent 4K performance and are far less comparable to mechanical hard drives.

The mechanical hard disk is even more interesting. Many people know that the 7200-rpm hard disk is faster, but where are they? The answer is actually this: In the continuous reading and writing ability, 7200 rpm hard drives are in the same specifications (capacity, cache), faster than 5400 rpm hard drive 10% to 15% up! However, at 4K degrees, 7200 rpm really exceeds 5400 rpm. However, but, but now is the world of solid-state drives, the SSD's 4K read and write capabilities have greatly exceeded the 7200-rpm hard drive, which makes such products become very ambiguous - continuous reading and writing, 4K can not be compared to the solid state Hard disk, power consumption, and heat greater than 5,400 rpm products, in fact, a bit tasteless taste.

Ignored response time

The response time is actually the time when the hard disk can react after you issue the command. The shorter the time, the better. Of course, SSDs have a natural advantage in this regard. It is also the first thing that can make you feel "Oh, SSDs are so fast!" rather than simply reading and writing speeds.

This is due to the fact that the SSDs are all electronically rewritable and do not have any mechanical action, so its response time is very short. For example, the minimum unit of HD Tune software is 0.1ms, and naturally it is 0.1ms. Such "slow", after all, is the "command" of the telecommunications number, even if the controller is also extremely responsive.

There is no way for the mechanical hard disk. After the operation command is issued, the mechanical hard disk drives the robot arm to move to the rotating disk platter through the controller in the logic circuit. This physical process naturally takes time to react, such as the common 7200 rpm hard disk. The reaction time is about 16ms.

The lower the CPU usage, the better

In addition to capacity, does a mechanical hard disk have the ability to "shy" the SSD? It can only be CPU usage. Unfortunately, the CPU usage of the SSD is higher than that of the mechanical hard disk. Xiao Bian temporarily does not know what the reason is. If you know, you may wish to comment on the Xiao Bian top you up.

Do not say the principle of the moment to talk about the impact, Xiao Bian think that with the use of SSD computer CPU performance can not be too bad, because you do not do anything, the SSD will eat about 10% of the CPU resources, and mechanical hard drives There are rarely more than 5% of the time, which is generally between 3% and 4%!

Note: Windows systems sometimes experience high CPU usage due to the use of SSDs. For details, see "100% Disk Usage? Windows 10 must do a few things, Xiao Bian has pushed, but this is a software problem that can solve the drop.

In fact, just as the CPU can't just look at the frequency, the number of cores, the hard disk is simply saying that reading and writing speeds are enough. Of course, this is not what manufacturers are trying to conceal. After all, computers are a product that requires a combination of performance. It's not just that a certain part is good enough.