It is only natural that owners of desktop computing systems and laptops seek in one way or another to increase their productivity. To solve this problem, some use the so-called overclocking (overclocking) of components, while others use the settings provided by the developers. When choosing any method, it is important to understand what exactly needs to be obtained, and to be well versed in the features of the selected method.
"Bottleneck"
It is known that one of the slowest components of a modern computing system is a hard disk based on a classic spindle system. SSD counterparts have appeared today, but they have not yet received wide distribution due to too high a cost.
Therefore, conventional HDDs are installed on almost every computer. As a result, it turns out that the standard DDR3 memory easily transfers 20,000 Mb / s; the internal bus of the central processor allows to process ten times more data; and a SATA-3 standard hard drive “accelerates” to only 100 megabytes per second under ideal conditions. It is no accident that it is recommended to use productive SSD models at least for system files. From the foregoing, a simple conclusion follows: it is the HDD that slows down the modern system, thus being the “bottleneck”. And since the user can easily make changes to the way the disk subsystem is processed, affecting the speed to a certain extent, one often hears the question of which mode is better: AHCI or IDE.
Standards
The disk interacts with other components of the computer system through a special control controller. This chip serves as a kind of command translator, converter. Until recently, the only "language" understood by the controller was the IDE protocol.
It arose at the dawn of the computer industry and was modernized several times. With the advent of high-speed SATA disks, a radical redesign of the protocol was required. And so AHCI came about . Advanced Host Controller Interface easily copes with increased data flow (interface), supports the fashionable NCQ command queue and implements the ability to disconnect the device on the go. So what is AHCI? An IDE that adds some new features. That's so simple at first glance.Opportunities and Prospects
Since the standards are backward compatible (the SATA device works perfectly according to the IDE protocol), in BIOS or its analogue there is almost always an item that allows you to select the desired mode.
In many cases, only due to this is it possible to achieve normal computer performance. Function mode selection is present only in the software of those motherboards that provide for working with SATA. These are all modern systems. However, here you can also attribute hybrid solutions that allow you to connect both classic IDE devices (PATA, wide comb comb) and SATA (compact connector). So, AHCI or IDE? What's better? To make it easier to understand this, here is a list of “bonuses” that the user receives by activating a more modern mode:
1. The data transfer rate on the internal electronic circuits “disk controller - controller board” reaches from 1.5 Gb / s (gigabits) for the modification of SATA-1 to 6 in the third revision. Recall that UDMA-6, which can run old hard drives, provides only 133 Mbps.
2. Speaking about which is better - AHCI or IDE, one cannot but indicate support for NCQ technology. Its essence lies in the fact that the hard drive can "intervene" in the queue of the flow of commands, rebuilding them to increase work efficiency.3. The ability to "hot" replace the device, which does not require shutting down the entire system.
4. Parallel access to all drives at once, without using alternate switching.
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AHCI driver packages were only integrated with Vista. All previous solutions from Microsoft do not have built-in support, so you need to either use “assemblies” or prepare media with the appropriate driver before installation. Windows 7 works fine with the new standard. Switching SATA from IDE mode to AHCI should be done from BIOS (Configure SATA item). In very rare cases, registry changes may be required.Switching method
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