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SSD Basics: M.2 NVMe PCIe SATA Meaning and Differences

SATA interface

Solid-state drives became popular in laptops, using the SATA interface and the same size as laptop hard drives, 2.5 inches.

At that time, if a desktop needed to add an SSD, it was necessary to use a hard drive cage to mount the SSD in the hard drive cage and then install it with the 3.5-inch drive bay of the case.

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SATA interface hard drives are commonly known as serial drives. The so-called serial port means that the data transfer is serial, as opposed to parallel (multi-pin simultaneous transfer). So you can’t think of a serial port like this, there are still many devices in use with COM ports, also called serial ports.

The SATA interface has undergone an evolution from 1.0 to 3.0, and SATA 3.0 has a tendency to be eliminated in the present.

VersionBandwidthSpeedMax Length of data cable
SATA3.06Gb/s600MB/s2 meter
SATA2.03Gb/s300MB/s1.5meter
SATA1.01.5Gb/s150MB/s1meter
An evolution from SATA 1.0 to 3.0

mSATA interface

Since the SATA interface is relatively large, the SATA Association later developed the mSATA (mini-SATA) interface.

M.2 NGFF SATA interface

M.2 NGFF interface SSDs come in a variety of size specifications, the more popular ones being 2240, 2260, 2280, and 22110, with 22 denoting a width of 22mm followed by a number denoting the length (mm).

The interface on a computer is usually designed to be compatible with multiple sizes, and you need to be aware of this when purchasing.

M.2 NVMe PCIe SSD

NVMe, which stands for non-volatile Memory Express, is a non-volatile Memory control specification, also known as a transport protocol.

NVMe enables multiple queues, or channels, to transfer data between SSDS and other devices, increasing transmission speeds.

So what does PCIe mean?

Let’s look at an old motherboard design, this motherboard chip is still from the era of the separation of the North and South Bridge chips were born.

In the picture, we see the LGA775 pin package specification CPU slot, the Intel 945G northbridge chip, and the Intel ICH7 southbridge chip. We also see PCI Express, SATA, and so on connected by thick lines that connect slots to chipsets, which we call buses.

In other words, the hard disk can be connected to the mainboard by SATA, PCIe, and M.2 interfaces, but the data transmission bus from the mainboard slot to the mainboard chip can be SATA or PCIe.

Based on this understanding, there are two specifications for the M.2 interface, socket2, and Socket3. The former supports SATA3 and PCIe X2 bus ports, and the latter supports PCIe X4 bus ports.

To further understand the interface protocol, let’s take another example.

Everyone remembers the computer BIOS inside a hard disk Settings, can choose AHCI or ATA, right? This was the choice we often faced when SATA came along (the transition from IDE to SATA). What it really meant was that when you got a SATA hard drive, you could choose to use AHCI or ATA. The NVMe protocol is similar but without the extra options.

In addition, an M.2 NVMe SSD can exchange data with the chipset via the PCIe X4 bus, and its theoretical bandwidth can reach 4GB/s. The actual speed depends on factors such as the storage medium and the control.

In short, the speed of a SOLID-state drive depends on the storage medium, master control, and interface used. DiskMFR will strive to convert these complex professional content into simple and direct scoring items so that everyone can buy their favorite baby in a simple way. M.2 NVMe solid-state drives have become a popular interface for speed improvement, so be sure to look out for them when buying a new PC.

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