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is it possible to have the Rpi act as a USB slave/device. I would like to be able to connect its usb to the USB of a standard computer, have the host machine recognize the RPI as a USB disk and then programmatically deal with the incoming data.

Any pointers, further reading etc is always welcome

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marked as duplicate by Bryan Dunsmore Mar 5 '13 at 1:18

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Possible duplicate: raspberrypi.stackexchange.com/q/271/797 –  Morgan Courbet Jan 11 '13 at 14:34

2 Answers 2

I can't get the exact link on the exact forum right now, but I recall this is an open hardware-related issue.
Short answer: everything is there on the board, but it's not wired. And eventually (don't remember) some passive components are missing. IIRC the pi folks advertised this as a cool, non-trivial task they hope someone do... In any case be prepared to solder some wires on a Surface-Mounted-components-Only (that is, tiny) PCB :(
The "somewhat official" wiki mentions it, but with no detail whatsoever.

How can I tag your question as non-trivial? ;)

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The Model B uses a SMSC LAN9512 USB 2.0 Hub and 10/100 Ethernet Controller IC to provide multiple physical USB host ports from the single USB OTG port available on the Broadcom SoC.

The presence of this hub IC prevents the USB ports from being used in slave mode. However, as the Model A does not have this IC present and instead just has a single USB port connected directly to the SoC's OTG port it should be possible to configure it to act in slave mode through software.

As the Model A has a female host USB port, a HOST to HOST conversion cable will be needed.

Please see this Raspberry Pi Forum thread for more details: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=15696

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Yes, you can use a Model A as a USB slave device: raspberrypi.org/forums/viewtopic.php?f=98&t=74098 Although it's quite limited to just usage as a mass storage device ( SD card) - no GPIO access, display or even ARM CPU usage. –  Mike Redrobe yesterday

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