SSD主流介面:
 
1、标准SATA接口:对应的主流产品是2.5inch SSD,其外围尺寸一般为100mm(L)*70mm(W)*7mm(H)
 
 
2、mSATA接口:mSATA接口是SSD小型化的重要过程,对应的产品是mSATA SSD ,JEDEC尺寸规范为50.80±0.15mm(L); 29.85±0.15mm(W); 3.75±0.1mm(H)。
 
 

 

3、M.2接口:最初叫NGFF,全名是Next Generation Form Factor,尺寸比mSATA小巧,产品形态较mSATA也更为丰富,对应的产品有M.2 2230/M.2 2242/M.2 2260/M.2 2280/M.2 22110,在逐步取代mSATA。单面厚度是2.75mm,双面厚度为3.85mm。

 
 
 
4、 U.2接口:最初的名称是SFF-8639,在2015年的台北电脑展上改名为U.2,产品形态为2.5inch,支持PCIex4,所以PCIe Gen3x4速度可达4GB/S。U.2目前还是新兴产品,主要适用于工作站和服务器领域的企业级市场。
 
 
 
 
 
 
 
SATA版本 頻寬 理論速度
SATA Express 16Gb/s 1600MB/s
SATA 3.0 6Gb/s 600MB/s
SATA 2.0 3Gb/s 300MB/s
SATA 1.0 1.5Gb/s 150MB/s
 
 
 
HDD vs SATA vs. NVMe

The table below shows a comparison of HDD, SATA SSD and NVMe SSD. NVMe, as a protocol designed specifically for PCIe SSDs, delivers better performance than PCIe and SATA SSDs using the AHCI protocol.

Table 1. Comparison of NVMe and SATA 6 Gb/s.

Interface

PCIe

SATA 6 Gb/s

Protocol

NVMe Protocol
(Optimized for flash SSDs)

AHCI Protocol
(Optimized for mechanical HDDs)

Bandwidth

PCIe x2 or x4 lane

PCIe x2 or x4 lane

SATA 6 Gb/s

Form Factor

M.2/PCIe Expansion Card/U.2

M.2/PCIe Expansion Card

M.2/2.5" SSD

Max. Read Performance

 >3000MB/s

 >2000MB/s

>500MB/s

Max. Write Performance

>2000MB/s

 >1500MB/s

>500MB/s

 
 
 
 
The following table compares bandwidths by generation. ATP's M.2 NVMe SSD is designed for a PCIe 3.0 interface and fits in a x4 lane, delivering up to 7.9 Gb/s transfer rate and up to 3.9 GB/s throughput.
Table 2. Bandwidth Comparison of PCIe and SATA.

PCIe

SATA

Generation

Transfer Rate

Throughput per Lane

Generation

Transfer Rate

Throughput 

Gen1

2.5 Gb/s

x1: 250 MB/s

x4: 1 GB/s

Gen1

1.5 Gb/s

150 MB/s

Gen2

4.9 Gb/s

x1: 500 MB/s

x4: 2 GB/s

Gen2

3 Gb/s

300 MB/s

Gen3

7.9 Gb/s

x1: 984.6 MB/s

x4: 3.9 GB/s

Gen3

6 Gb/s

600 MB/s

Gen4

15.8 Gb/s

x1: 1,969 MB/s

x4: 7.8 GB/s

 
 
 
ref:
http://www.chinaflashmarket.com/Instructor/151736
 
https://zh.wikipedia.org/wiki/SATA
 
http://www.atpinc.com/Memory-insider/nvme-vs-sata-ssd-pcie-interface
 
 

 

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