Re: usb mass storage device emulation through usb port

Alan Stern <[email protected]>
Newsgroups gmane.linux.usb.devel
Message-ID <[email protected]>
On Wed, 12 Sep 2007, Bgs wrote:

> 
>   Hi all,
> 
>   I'm looking for an answer regarding the following issue: is it 
> possible to emulate a mass storage device through an ordinary USB port? 
> For example 'export' an internal block device and make it appear like a 
> usb drive for an external device (through some ordinary usb cable 
> without any additional chips)?
> 
>   For example export a notebooks hdd for the desktop machine or alike...

It is not possible; special hardware is needed.  An ordinary USB port 
on a computer can act only as a host, never as a peripheral.  You would 
need to have a device port or an OTG ("On-The-Go") port, which can 
adopt either role.

Alan Stern


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