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Embedded Linux as Attached USB Storage Device?

Posted by Cliff on from the penguins-as-consumer-devices dept.

dont_drink_the_water asks: "I am currently working on a few projects which will (hopefully) use Embedded Linux to deliver content (mp3 players, web servers, other possibilities). The question is, can Linux act as a USB attached hard drive, so that other machines can simply read/write data on the hard drive by using the USB port? Is anyone currently working on projects like this, and has any software been developed for this purpose?"

3 of 20 comments (clear)

  1. The mine terrapin pruports to do this.... by pwagland · · Score: 3, Informative
    plus a whole lot more... check it out here.

    Note: While they say they are based on linux, they do not appear to of have released the sources anywhere that I can find. They do claim to be making a developers kit, but that is alos hard to find at the moment....

  2. Hmm by itwerx · · Score: 3, Interesting

    Why? It would be much cheaper and simpler to simply design an I/O interface to do that (or use any of the generic designs published by most of the big chip houses. E.g. NEC, Motorola, Maxim, etc.)
    Unless you're talking a RAID chassis or something (which be insanely stupid to hang off USB), it isn't much more than serial/parallel conversion/buffering with some voltage matching and a little driver code.
    Using embedded Linux for this would be like converting a laptop into a trip-computer for your bicycle. Major overkill.

  3. USB slave mode support. by gillham · · Score: 4, Interesting
    The real question is whether Linux supports USB slave mode, rather than just host / master mode. Check this site for an example.

    Basically my understanding of this question is:
    "Can Linux act as a USB slave, and provide a slave or 'target' implementation of the USB Mass Storage Class?"

    In other words, can I build a fancy MP3 box with lots of storage that appears to be a USB hard drive to the host PC, but is really a Linux machine pretending to be "just" a USB hard disk?

    USB slave drivers and an Open Source implementation of the slave side of the USB Mass Storage Class would be cool.