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1、首先解释一下概念
M.2是一种硬盘接口,它有三种形态,分别为B key,M key,B&M key,
SATA,PCI-Ex2,PCI-Ex4是指数据走的通道,
NVMe,AHCI是一种新的接口标准(协议)。
2、分别配图说明
2-1、M.2接口三种形态B key,M key,B&M key,
每种接口又有三种尺寸2242、2260、2280
2-2、M.2三种形态接口分别支持的通道类型
B key: 接口的固态硬盘(不常见了),走SATA通道和PCI-Ex2
M key:接口的高端固态硬盘,走PCI-Ex4通道
B&M key接口的固态硬盘,走PCI-Ex2或者SATA
SATA接口:已经发展到第三代,最大理论速度是600MB/s. SATA接口上层对接的系统控制接口属于AHCI。我们平时用的SATA
SSD用的一般是SATA3, 实际测试速度在550MB/s左右,这比普通机械硬盘100MB/s左右的读写速度,要快数倍了。
表中PCIE1.0/2.0/3.0即为Gen1、Gen2、Gen3
2-3、NVMe与AHCI协议对比
NVMe标准:是为PCI-E通道固态硬盘量身定制的,全新标准支持多种不同固态硬盘接口,包括PCI-E、M.2及U.2等。
AHCI标准:为SATA通道的硬盘设计。
NVMe标准延迟低,传输速度快(IOPS高),功耗低等优势。
注意:支持NVMe的可以是PCIE接口,但是不是所有的PCIE接口都是NVMe标准。请一定看清楚。