When USB was designed, they didn't think about what is called cross-over in
the ethernet world. Therefore hardware is typically limited to host or device.
Hardware that can do both is called OTG USB hardware.

OK fine, i now understand exactly what "OTG" means in eg. microchip microcontrollers. So this few $ things can do this, and expensive PC cannot.

So the only way to do this is to make a microcontroller based bridge or there are such solutions already available?

actually the only thing i want is CD/DVD USB simulator using file on my laptop or even separate flash memory (pendrive).
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