D:2.0 standard model with power supply port 15cm
E: 2.0 standard model with power supply port 50cm
F:2.0 standard model with power supply port 100cm
G:3.0 high-speed model with power supply port 15cm
H:3.0 high speed model with power supply port 50cm
I: 3.0 high-speed model with power supply port 100cm
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