There are a couple of projects which already have done this, I built one myself for working in a tech shop to replace the hundreds of image cd's lying around. The most complete one I can find is http://renosite.com/index.html
The project I followed, which was the original proof of concept for the one above used the teensy and costed me less than $30 to replicate. (I skipped the lcd screen and used a small sd card instead of a hdd which the new project does as well.)
[Suggestion] Idea? Usb Rubber Ducky As Iso Stick
in Classic USB Rubber Ducky
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There are a couple of projects which already have done this, I built one myself for working in a tech shop to replace the hundreds of image cd's lying around. The most complete one I can find is http://renosite.com/index.html
The project I followed, which was the original proof of concept for the one above used the teensy and costed me less than $30 to replicate. (I skipped the lcd screen and used a small sd card instead of a hdd which the new project does as well.)
http://cdemu.blogspot.com/