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M.2 PCIe

Users Manual

INTRODUCTION

REQUIRED TOOLS

& PREPARE

WINDOWS DRIVERS

& CLONE

DESKTOP INSTALL

LAPTOP INSTALL

GLOSSARY

Computer bus interfaces provided through the M.2 connector are

PCI Express 3.0 (up to four lanes), Serial ATA 3.0, and USB 3.0.

The M.2 connector has different keying notches that denote

various purposes and capabilities of M.2 hosts and modules,

preventing plugging of M.2 modules into feature-incompatible host

connectors. In addition to supporting legacy Advanced Host

Controller Interface (AHCI) at the logical interface level, M.2

specification also supports NVM Express (NVMe) as the logical

device interface for PCI Express SSDs implemented as M.2

storage devices.

NVM Express (NVMe)

NVMe or Non-Volatile Memory Host Controller Interface

Specification (NVMHCI), is a technical standard that specifies the

operation of host bus adapters accessing solid-state drives (SSDs)

attached through the PCI Express (PCIe) bus. Basically, NVMe is a

driver between a host and a device. As a logical device interface,

NVM Express has been designed from the ground up, capitalizing

on the low latency and parallelism of PCI Express SSDs, and

mirroring the parallelism of contemporary CPUs, platforms and

applications. By allowing parallelism levels offered by SSDs to be

fully utilized by a host's hardware and software, NVM Express

brings various performance improvements. Therefore, to

experience the best performance, NVMe is best implemented with

a direct PCI Express connection, foregoing any backwards

compatibility with SATA. NVM Express should not be confused with

SATA Express, which is a host bus specification (or physical

interface) that supports both SATA and PCIe storage devices, and

suffers from limitations that are not bound to NVMe.