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。
| 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 |
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 |
AHCI Protocol |
|
|
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 |
|
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 |
|||
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