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    SubjectRe: Problems accessing USB Mass Storage
    On Tue, Sep 17, 2002 at 05:04:19PM -0500, Thomas Dodd wrote:
    >
    >
    > Rogier Wolff wrote:
    > > On Tue, Sep 17, 2002 at 10:46:31AM -0700, Greg KH wrote:
    > >
    > >>On Tue, Sep 17, 2002 at 12:37:37PM -0500, Thomas Dodd wrote:
    > >>
    > >>>I get the feeling it's not a true mass storage device.
    > >>
    > >>Sounds like it.
    > >
    > >
    > > Nope. Sure does sound like it's a mass storage device. And it works
    > > too.
    > >
    > > The kernel managed to read the partition table off it, and got
    > > one valid partition: sda1.
    >
    > Accept that you cannot read data from the device. At all.
    > Even dd fails. And the windows drivers work (using XP
    > in vmware it think it was) correctly on this same device.
    >
    > -Thomas

    But it did read the first 8 blocks off the devices when it
    read the partition, the usb debug showed:

    usb-storage: Command READ_10 (10 bytes)
    usb-storage: 28 00 00 00 00 00 00 00 08 00 30 da

    With offsets starting at 0 -

    Bytes 2 - 5 are the logical block address, all 0.
    Bytes 7 - 8 are the transfer length - 8 blocks.

    The last two bytes are junk.

    You should be able to run the equivalent:

    dd if=/dev/sda of=/dev/zero bs=512 count=8

    And, look in dmesg for the failure message of the first read that fails, it
    could have set the device offline.

    -- Patrick Mansfield
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