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How is AS SSD used? How AS-SSD sees 4k alignment

SSD is a common topic among computer users. The bottleneck of the old-time mechanical hard disk has become more and more unsatisfied. The new era of solid-state hard disk comes into being. SSD can bring extreme speed switch. Machine experience, and the computer should be more smooth. However, if you want to see the performance of the SSD, we generally need to use the AS SSD tool to detect the SSD read speed, 4K alignment and so on. So how is AS SSD used? How to see 4k alignment, the following computer Pepsi network Xiaobian for novice friends, a detailed introduction to AS SSD use skills.

About AS SSD Software:

AS SSD is a professional SSD (Solid State Drive) transmission speed test tool, which can not only test the read speed of SSD, but also Check if the SSD is 4K aligned, whether to enable ACHI mode, etc.

AS SSD Tools Interface

AS SSD tools are compact and support XP, Win7/8/Win10 systems. You need to install and run the .NET Framework 2.0 environment under XP.

AS SSD tool test principle:

Continuous read and write test (Seq)

AS SSD will be in 16MB size first. Continue to write to the tested partition to generate a file up to 1GB in size, then read in the same 16MB, and finally calculate the average score to give the result.

4K random single queue depth test (4K)

The software will generate 1GB size SSD test file in 512KB units, then LBA in this file Random write and read tests are performed in the address range of 4 KB units until the range is run. Finally, the average score is given to give the result.

4K random 64 queue depth test (4K-64Thrd)

SSD evaluation software will generate 64 16MB test files, then 4KB at the same time Write and read tests in these 64 files at the same time, and still use the average score as the result.

Data Access Time Test (Acc.time)

The software will read the full address range (LBA) and write randomly in 4KB. The input is in 512B unit size, randomly written in the reserved 1GB address range, and finally the result is given by the average score.

Because the test software such as AS SSD Benchmark is popular, and the continuous read and write performance is at the top, plus the manufacturer's data on the "sucking help", so many players see the performance of SSD Just looking at the results of continuous reading and writing, in fact, for SSD, 4K random performance is more important, especially when using SSD as a system disk.

The final AS SSD scores according to his formula. The following is the usage of AS SSD.

How to use AS SSD How to see 4K alignment?

AS SSD is a small and practical free tool, the method is very simple, the steps are as follows.

1. First download and install the AS SSD tool on a computer with a solid state drive (online search, there are many available for download, including English and Chinese).

2, after installation, open AS SSD, and then click "Start" below to detect the SSD read speed, 4K alignment, AHCI mode, etc., as shown below.

AS-SSD Usage

As shown in the figure above, in the detected results, Read represents the SSD read speed and Write represents the SSD write speed. The most important parameter of a solid state drive is the read and write speed, which is about performance. The theoretical limit speed of SATA 6Gbps solid state drive is about 572MB/s (6000000000/10/1024/1024). At present, ATTO may run to the highest speed of 550MB/s (using SandForce master to run 100% compressible data), large The continuous performance of most mainstream SSDs will be 500+MB/s, but continuous write speeds are now difficult to break through 500MB/s (uncompressible data).

Also on the left side:

iaStorA - OK means AHCI mode is on;

1024 - OK means 4K alignment is on.

In the SSD computer, AHCI mode and 4K alignment must be started at the same time to achieve the best performance of the SSD. If this optimization is not enabled, it will not only affect the reading speed but also the life of the SSD.

In general, SSDs read and write operations are significantly more than write operations, this ratio is 10 to 20:1. Therefore, for the performance of SSD, we must first look at the results of 4K random reading, and then look at the results of 4K random writing and continuous reading. The ability to write continuously is actually the last.