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I'm an experianced *nix user, admin and programmer but I think I must have been living in a cave the last few years as I'm just now getting around to ...
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  1. #1
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    Some USB storage devices work, others don't


    I'm an experianced *nix user, admin and programmer but I think I must have been living in a cave the last few years as I'm just now getting around to playing with USB storage. My problem is that I don't know how it works so I can't debug it. Pointers to info and/or hints would be nice.

    Here is what's happing on my Fodora 3 machine:

    I made a mont point in /etc/fstab called /mnt/usb. I can plug in my little 32MB USB drive and mount it. It works fine. It shows up with "lsusb" I can read/write file. All is well. My Sony camcorder (TRV33) has a sony memory stick inside. When I plug the camcorder into USB it works fine also. So there is good proof the drivers, generic SCSI and so on are all there.

    Problem: Some devices simply "don't work". They don't even show up with "lsusb". These devices work under Windows 2000 and XP. The devices that fail are generic multi-card readers. I'd ike to install a card reader in an external drive bay but so far no luck with these.

    I'm sure if the device will show up with lsusb I can make it go from there. But I do't uderstand what chain of events has to happen to cause a device o appear with lsusb.

    So far the only documentation for debugging USB storage starts with "step one, Look at the output of lsusb." What's step zero?

    Thanks,

  2. #2
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    linux

    In direct response to your question, Step 0 is watching dmesg and/or /var/log/messages to see if there are any entries corresponding to the connection/detection of the USB card reader device, either on boot, when its connected, and/or when you insert some type of media into the reader.

    I pulled up this link for card readers under linux (there's plenty of info around, and don't worry, there's plenty of people having trouble with these bloody things):

    http://www.linux-sxs.org/hardware/flashreaders.html

    (There seems to be a tendency for people to compile the usb support as kernel modules rather than right into the kernel. I've had success either way.)

  3. #3
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    I don't know if you already found this but I found it today. I haven't had time to read it let alone understand it but it looks pretty complete at first glance

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  5. #4
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    http://www.linux-usb.org/

    Sorry. somehow I forgot to paste the above link in the above message

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