super strange


so i'm trying clean install el capital on friends macbook air weird going on.

i've created boot usb of el cap after installation when computer finished i'm taken desktop takes long time load , usb breing read. os/computer super slow. mouse cursor studders. what's going on?

i've clean installed before. macbook pro , macbook without these isssues.

seems if entire operating system booting usb 2.0 or something.

when remove usb , re start there no operating system on computer. went wrong. i'm not doing right.

ideas??
 

sounds have installed operating system onto usb, instead of computer.
 


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