Why NVMe^™ is Faster Technology

One of the newest innovations in storage technology is the NVMe protocol. An NVMe SSD will deliver much faster speeds than a hard drive, and significantly faster speeds than a SCSI or AHCI SSD.

NVMe、NVM Express™ 或 Non-Volatile Memory Host Controller Interface Specification（非易失性内存主机控制器接口规范），是专门用于访问通过 PCIe® (PCI Express®) 总线附加的非易失性内存介质的通讯规范。该规范旨在利用固态硬盘的并行特性。NVMe 协议与 PCIe 总线结合，提高了 NAND 技术的读取和写入的速度，实现更快的非易失性存储。在此处了解有关 PCIe 的更多信息。

NVM Express Inc. 是计算机行业联盟，其创立旨在监督可扩展主机控制器接口的标准开发。

固态硬盘 (SSD) 面世时旨在替换普通硬盘驱动器 (HDD)。最终，固态硬盘采用与普通硬盘相同的接口协议 (SCSI) 和物理连接 (SATA)。从普通硬盘驱动器转变至固态硬盘后，由于其技术更快，因此用户随即看到存储驱动器的速度变快，但是接口和连接的问题使得固态硬盘无法实现全速增益。

尽管此时已经出现了更快的通讯协议和物理连接，但是由于计算标准限定了固态硬盘可以使用的通讯协议，因此固态硬盘制造商不得不使用相同的固态硬盘协议，以便于升级其计算机。随着计算机的外形尺寸从台式机、大型笔记本电脑发展为小型笔记本电脑、平板电脑和手机，对小型存储驱动器的需求变得更加明显。外形尺寸是更改通讯协议、在大型计算机中添加备用连接和通信的契机。

The combination of the NVMe protocol and the PCIe connection with an SSD results in read and write speeds that are four times faster than a SATA SSD with a SCSI protocol.

NVMe complements the parallel structure of contemporary CPUs, platforms, and applications. Parallel structure allows more commands to flow simultaneously. NVMe uses an optimized path to issue commands and complete input/output and supports parallel operation with up to 64,000 commands within a single I/O queue and 64,000 possible queues. Older protocols such as SCSI are serial in nature, with a limited number of commands in the single queue.

Because NVMe was designed specifically for the NAND technology used in solid state drives, it takes advantage of how the underlying technology works to make a faster drive.