How many types of m.2 interfaces are there?

There are two types of m.2 interfaces: 1. Socket 2 type, supporting SATA and PCI-E X2 interface standards. If the PCI-E ×2 interface standard is used, the maximum reading speed can reach 700MB/s. , writing can also reach 550MB/s; 2. Socket 3 type, can support PCI-E X4 interface standard, and the theoretical bandwidth can reach 4GB/s.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The M.2 interface is a new host interface solution that is compatible with multiple communication protocols, such as sata, PCIe, USB, HSIC, UART, SMBus, etc.

The M.2 interface is a new generation interface standard tailored for Ultrabooks to replace the original mSATA interface. Whether it is smaller size or higher transmission performance, M.2 is far better than mSATA.

M.2 interface is a new interface specification introduced by Intel to replace MSATA. In fact, for desktop users, the SATA interface is enough to meet the needs of most users. However, considering the storage needs of Ultrabook users, Intel has eagerly launched this new interface standard. Therefore, we have seen this new M.2 interface on the new 9 series motherboards released by ASUS, Gigabyte, MSI, etc., and it is now popular.

M.2 interface has two types:

Socket 2 (B key——ngff) and Socket 3 (M key——nvme), among which Socket2 supports SATA, PCI-E Socket 3 among them can support PCI-E ×4 interface, with a theoretical bandwidth of up to 4GB/s.

Advantages of the m.2 interface

Compared with MSATA, M.2 mainly has two advantages.

• The first is the advantage of speed.

• The second one is the size advantage.

  Although MSATA's solid-state drives are small enough, MSATA still has no advantage over solid-state drives with M.2 interface. Like mSATA, M.2 standard SSD can be arranged with single-sided NAND flash memory particles or double-sided arrangement. The total thickness of single-sided arrangement is only 2.75mm, while the thickness of double-sided arrangement is only 3.85mm. The size disadvantage of mSATA is much more obvious. The size of 51mm×30mm makes mSATA not have an advantage in area, and the single-sided layout thickness of 4.85mm is too thick compared with M.2. Plus, M.2 offers higher storage capacity even at the same size.

Naming rules for M.2 interfaces

Since there are M.2 interfaces of various sizes and functions, it is necessary to specify a standard Naming rules are used to divide these interfaces.

The naming of the M.2 interface mainly follows the following principles:

1. Adapter size. (Length and width)

2. The maximum Z-axis height from the top to the bottom of the adapter.

3. The location of the Mechanical Connector Key.

The naming rules clearly describe the function of the interface, the required connectors, and the z-axis height. The width of the connector must be one of 12mm, 16mm, 16.5mm, 20mm, 22mm, 28mm, or 30mm. The length of the connector must be one of 16mm, 20mm, 24mm, 26mm, 28mm, 30mm, 42mm, 60mm, 80mm, and 110mm. All other sizes are illegal.

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