How different is SATA and SATA II

Theoretically, SATATIII is 2 times that of SATA.

SATA is generally 150MB s

SATATII is 300MB s

Differences between SATA2 and SATA3 interfaces:

From the appearance alone, the SATA3 and SATA2 ports on the motherboard are basically identical, but many motherboards are often marked with different colors in order to distinguish the SATA2 and SATA3 hard disk interfaces. Most motherboards that support the interface SATA2 connector are black, while SATA3 connector colors are yellow, white, blue, etc.

The appearance of SATA2 and SATA3 motherboards is basically the same, but many low-end motherboards still use SATA2 and SATA3 dual-interface hybrid mode, such as A75 on AMD platform, B75, H81, and B85 motherboards on Intel platform are SATA2 and SATA3 dual-interface mixed mode, while some mid-to-high-end motherboards, such as A88, H87, Z87 and other motherboards, are all interfaces.

In terms of differences, the main difference between SATA2 and SATA3 is the different transmission rates, the latest SATA3 transmission rate can reach 6GBS, while the SATA2 interface transmission rate is 3GBS. In terms of transfer rate, the SATA2 hard disk interface can no longer meet the needs of SSDs and some Qualcomm mechanical HDDs, the following figure shows the comparison of the read speed of the hard disk using the same computer SATA2 and SATA3 interfaces using SSDs.

It is important to note that getting the best read speed from a hard drive depends not only on the hard drive, but also on the hard drive interface. That is to say, as long as the hard disk supports the interface, and is connected to the motherboard that supports the interface, the hard disk of the computer will play the best performance, so some old computer hard disks, themselves only support at most, even if this kind of hard disk is connected to the motherboard, the speed is still the speed of SATA2, because the hard disk itself is hard.

In the same way, if the hard disk supports it, but the motherboard only has an interface, then the actual speed of the hard disk is only the speed of SATA2. Like the current mainstream mechanical hard disks and SSDs are interfaces, especially the current solid-state drives are interfaces, users only need to choose the motherboard that supports the interface when installing the SSD.

1. Differences in appearance:

The SATA2 and SATA3 ports on motherboards are basically the same, but many motherboards are often marked with different colors in order to distinguish between SATA2 and SATA3 hard disk interfaces. Most motherboards that support the SATA3 interface are black, while the SATA3 interface is yellow, white, blue, etc.

SATA2 and SATA3 motherboards still use SATA 2 and SATA 3 dual-interface hybrid mode in many low-end motherboards, such as AMD platform A75, Intel platform B75, H81, B85 motherboards are SATA 2 and SATA 3 dual-interface mixed mode, and some mid-to-high-end motherboards, such as A88, H87, Z87 and other motherboards are all interfaces.

2. Difference in transmission rate:

The theoretical maximum transmission rate is.

The theoretical maximum transmission rate is that if the hard disk is yes, then the data cable must also be equipped to achieve the maximum speed. If you use a data cable, the read speed will be reduced.

3. Differences in NCQ technology:

NCQ technology can optimize the order of execution of the instruction base of the hard disk, avoiding the mechanical movement of the head to read and write different positions of the hard disk in the order of receiving instructions like the traditional hard disk, on the contrary, it will sort the command after receiving it, and the sorted head will be addressed in a high-efficiency order, so as to avoid the loss caused by repeated head movement and prolong the life of the hard disk.

The number of NCQ instructions has been increased, including the provision of priority processing for real-time resources, mainly for video and audio transmission. In addition, SATA will also prioritize the resources that are being processed by the system, which greatly improves the efficiency of the system.

It doesn't matter, and the difference between the two is barely felt.

The speed of the hard disk is generally divided into two types: the burst transfer rate and the internal transfer rate, bursting refers to the speed between the hard disk cache and the computer system, which varies greatly between SATA2 and 3, but it is rarely the case in practical applications: that is, the task can be completed by reading the hard disk cache directly, so this indicator is basically not very useful.

The internal transfer rate refers to the speed at which the head of the hard disk can read and write the platter, which is the most important. When you boot or run the software, you can pay attention to the movement of the hard disk, which is to read data from the platter, so this indicator is also the most direct experience. Although the development of mechanical hard disks is much faster than before, the transfer speed still does not exceed the upper limit of SATA2, so it is the hard disk itself that limits the speed rather than the interface.

Just like a car can't even run 80 kilometers, is there a difference between a speed limit of 100 and a speed limit of 200?

If the SSD is different, the read and write speed is 3, 400M or even 5, 600M per second, which is far more than the upper limit of the SATA2 interface, and the gap between SATA2 and 3 will be obvious.

Unless you change to an SSD, if you are an HDD, you can use it with confidence, and you may be able to see the difference between the two interfaces, but you can't actually feel it at all.

Due to the working principle of HDD, SATA3 is not very effective. It's not popular yet, and there are very few corresponding peripherals.

If you use a normal HDD, there is no difference in speed.

If you use an SSD, the difference is huge. The interface speed will be at least 50% faster.

The transfer rate of the three is not the same, it can be used universally, and your hard disk is SATA2.

1. The transmission rate is not the same, and it can be used universally.

2. If SATA3 is backward compatible with SATA2, if you connect the SATA3-supporting HDD to the motherboard that only supports SATA2, it can only be recognized as SATA2 HDD and run at SATA2 speed.

3. At present, the internal transfer rate of most hard disks is simply not enough to give full play to the performance of SATA3.

4. The theoretical transmission speed is 3Gbit S and the theoretical transmission speed is 6Gbit S.

1. If the hard disk can be directly plugged into the SATA1 interface, the SATA1-4 interface marked on the motherboard means that the motherboard supports 4 SATA devices at the same time. Marks 1-4 are the order of SATA interfaces, which are checked by BIOS in turn when powered on, from 1 to 4. It should be connected to the SATA1 interface, and other SATA ports can be connected to other SATA devices.

2. Theoretically, the performance is exactly the same. If you distinguish , it is recommended to plug in some macros on the fast type. If it's all yes or yes, plug it into the first connector.