I believe that now every family's computer, even notebooks will be equipped with an SSD, many people on the Internet have confirmed that they want to play the full performance of SSD must use Windows7 or above system. Needless to say, the notebook does not have a driver installed on the XP system. And now there are still friends who still install Windows XP on the desktop computer using SSD, and XP does not support Trim, and there is no problem with Trim? What additional impact will it have?
▲I believe you are Microsoft Windows XP still remembers, this can be called the most successful operating system in Microsoft history, there are still many users, and the latest Windows 7 can be understood as an improved version of Windows Vista, and its more features, stronger The optimization has become the new favorite of many users. Currently, both systems have a large number of users.
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While many users use SSD, many people still stay on XP on the system, and many of these users have not found that using XP will not bring out the best performance of SSD. Let us now test the situation under the default settings of each system.
▲ systems using different test comparison
First, let's take a look at the theory test scores of the two systems, in which we can see, AS SSD Benchmark fully displayed properly in Windows 7, but XP there 2 error reporting items, and the results are also very far away, in the end why? Explain the following one by one.
AHCI is very important
It is inevitable that BIOS is enabled for AHCI. When it is turned on, SSD supports NCQ. When the queue depth (QD) increases, the performance will increase by geometric level, while IDE does not support NCQ. The queue depth increase performance will not change much. And we can also see that in the case of XP does not open AHCI by default (normal original XP installation with AHCI will be blue screen, and GHOST piracy with many garbage software), the increase in queue depth (QD) performance has not improved, For the average user to use the original XP, it is necessary to make cumbersome settings. I believe that you can afford SSD, there will be a computer that can run Windows7 perfectly and smoothly?
SSD, 4K alignment is very important!
Currently, the SSD we have used has been upgraded from 512B defined by the previous mechanical hard disk to 4KB. The old NTFS specification, the partition has always started from the sector of 63, so that the first 4KB of the user's first data will be stored between 31.5KB and 35.5KB of the system logical sector, causing the user to completely lead to the back. The sector will be stuck in 2 physical sectors, and the read-rewrite operation is required when writing, which greatly burdens the SSD, thereby greatly reducing the write performance. Solving this method is very simple, and can be solved by formatting with Windows 7.
▲ On the use of SSD, and Windows7 compared to Windows XP, the biggest advantage is to support Trim, then what is the use of Trim.
Trim brings the most reasonable solution for SSD performance and life!
Originally on a mechanical hard disk, when writing data, Windows will notify the hard disk to erase the previous one and then write the new data to On the disk. When deleting data, Windows will only mark it here, indicating that there should be nothing here, and then actually delete it when the data is actually written, and the action of marking will remain in the disk cache until the disk is idle. Execute again.
This way, the disk takes more time to perform the above operations, and the speed will of course slow down.
When Windows recognizes the SSD and confirms that the SSD supports Trim, when the data is deleted, the delete command will not be notified to the hard disk. Only the Volume Bitmap is used to remember that the data has been deleted. A Volume Bitmap is just a disk snapshot that is built much faster than directly reading and writing the hard disk to mark the deleted area. This step has saved a lot of time. Then, when writing data, since the NAND flash save data is purely digital, you can directly write new data to the deleted blocks in the snapshot according to the Volume Bitmap, without taking the time to erase. Original data.
Here we will do a Trim test, I use IOMETER for 1 hour full 4K random data write test, dirty SSD, then delete the SSD partition (send Trim command, XP does not support) and idle for 5 minutes, See how far the performance gap between Trim and Trim is.