m2 is the interface, you can understand the shape, not the essence, m2 divided into a variety of, m key, b key, simply put, m2 divided into pcie x4 controller and sata3 controller, if it is sata3 controller, then this m2 and sata3 solid state is the same performance, such as samsung's 850evo, there is a 2.5 sata3 and m2 for example, Samsung's 850evo has 2.5 sata3 and m2, both of which have the same performance.
A. SATA3 hard disk interface:
Basically now all motherboards have this hard disk interface, because this interface is the original mechanical hard disk interface for the longest time, sata3 interface
Basically every motherboard will have a SATA3 interface, and this kind of hard disk is generally common to us like this:
The above picture is the SATA3 interface of the SSD.
This hard disk speed constrained by the interface of the physical read theoretical limit is generally 600MB / S, but usually is basically 480MB / S ~ 580MB / S read speed, so this interface for the solid state advantage is still a limitation, so the emergence of the M.2 interface of the solid state drive.
The M.2 interface:
M.2 is a new interface for SSDs, an alternative to the new MSATA interface specification introduced by Intel, which is often referred to as NGFF, the full name of the English language: Next Generation Form Factor.
The main advantage of the M.2 interface SSD is that it is smaller than the traditional SATA3 interface. The main advantage of M.2 interface SSDs is that they are smaller in size than traditional SATA3.0 and MSATA, and have faster read speeds and better compatibility with some mobile devices.
The emergence of the M.2 interface has laid the foundation for the speed advantage of solid state drives:
:Solid State Drives (Solid State Drives), referred to as solid state disk, solid state hard disk (Solid State Drive) with solid-state electronic storage chip array and made of hard disk, by the control unit and the storage unit (FLASH chip, DRAM chip). The hard disk is composed of a control unit and a storage unit (FLASH chip, DRAM chip).
Solid state hard disk in the interface specifications and definitions, functions and methods of use with the traditional hard disk is identical, in the product shape and size is also completely consistent with the traditional hard disk, but the I / O performance relative to the traditional hard disk is greatly enhanced. It is widely used in military, automotive, industrial control, video surveillance, network monitoring, network terminal, electric power, medical, aviation, navigation equipment and other fields.
The operating temperature range of its chips is wide, commercial-grade products (0~70℃) industrial-grade products (-40~85℃). Although the cost is higher, it is gradually popularizing to the DIY market. Because SSD technology is different from traditional hard disk technology, it has generated a number of emerging memory vendors. Manufacturers can build SSDs by simply purchasing NAND memory and matching it with an appropriate control chip. The new generation of SSDs commonly use SATA-3 interface, M.2 interface, MSATA interface, PCI-E interface, SAS interface, CFast interface and SFF-8639 interface.
But when SSDs are powered off for long periods of time and left in high temperatures, there is a risk of data loss. Therefore, using an SSD to backup data is not a good option.
With the rapid development of the Internet, people's need for data storage is also increasing, and now a number of storage vendors have launched their own portable SSDs, and there are even more mobile SSDs that support Type-C interfaces and SSDs that support fingerprint recognition.