IDE or AHCI modes. What is it? What are the differences? HOW DO I TURN IT ON?

What is the best connection type? For a SSD, the only possible mode of operation is AHCI. If you use a SATA hard drive, you can switch to this mode of operation via BIOS.

For SSD, the only possible mode of operation is AHCI;

What is IDE Mode

Such rules of work of the equipment are almost always active by default. They ensure the compatibility of any iron – both ultra-modern and outdated junk.

This is one of the oldest ways to communicate with each other and the motherboard. The “clean” IDE interface is an 80-core cable that can also be used to connect devices in parallel to one port: for example, a bifurcated loop is inserted into the motherboard at one end and the other two into the hard drive and optical drive.

In this case, a 4-pin molex connector is used for power supply. Although SATA differs in the type of connectors, devices with this interface can also operate in IDE-compatible mode, although they lose their data rate.

What is ACHI

The name of the technology is abbreviation for Advanced Host Controller Interface. This is a technology that is used to connect SATA drives. This type of drive can also operate in IDE mode, which is compatible with older applications and equipment.

In this mode, the drive is no different from the old PATA hard drives. To take full advantage of SATA, the controller must operate in ACHI mode. The main features can be considered:

The NCQ (Native Command Queuing) technology, which reduces the amount of movement of the hard drive read head, which increases the speed of the drive.

  • Hard drive replacement hot. The user can connect a new SATA format drive without turning off the computer.

In general, ACHI activation has a positive impact on the hard drive, as it increases the access speed to stored data. The mode is designed specifically for hard drives, and when using SSDs there will be no apparent acceleration in data access speed.

The only chip in this mode is the ability to hot-swap a connected drive without having to shut down the computer. The Winchester or SSD is recognized by the system instantly and is ready for use as soon as power is applied to it.



What is the difference between IDE and AHCI

IDE is an outdated interface that used to connect hard drives and optical drives to the motherboard. It is a wide 40-pin bus that can run in parallel, i.e. both types of media (or optionally 2 hard drives at once) can be connected to one slot using a split loop.

No more obvious advantages over SATA, a newer interface, this protocol has no more: the data transfer rate is lower and some useful features are missing.

Since traditionally the principle of inheritance is observed in computer technology, that is, new improved standards (no matter what) must comply with the old and support the declared functions. Thus, any SATA hardcaster can work under IDE compatible regulations.

AHCI is the “natural environment” for SATA hard drives and the only viable option for SSDs. SSDs in IDE mode do not work and do not support this protocol: at the time of their introduction, IDEs were barely in use anymore.

On top of that, connecting high-speed storage over a slow bus is also a perversion. It’s like putting a big sail on a tank tower and catching a tailwind to go faster.


Enabling AHCI mode in Windows 10

We’ll do everything through the registry. The command line is not used in this case. The method is suitable for both 32 and 64-bit versions of the operating system.

How to change the mode from IDE to BIOS

The AHCI protocol is designed specifically for devices that connect via a SATA interface.

Winchesters also have support for the older IDE protocol, but HDD will work worse in this mode and will not be able to use some features.

For SSD drives this is the only possible mode of operation – IDE or ATA they do not support at all. So, the instruction to activate the required protocol through BIOS, step by step.

To get to the BIOS, reboot your computer and press F2, Del, or Escape before booting Winda. The required option is in the Advanced category and is called SATA mode. Select AHCI and save your changes by pressing the F10 key.

However, it may be that the required option is simply not available as there are no drivers available. In this case, you need to make changes to the registry.

Activating AHCI with registry

Algorithm of action:

  • Click the Win + R combination, type the regedit command and press Enter;

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