USB flash drive vs USB hard disk

Discussion in 'PC Hardware' started by Mr. Man-wai Chang, Nov 21, 2013.

  1. How could a device tell their differences? By looking for a partition table?

    I have a Panasonic TV that can record programs on USB hard disks only. I
    am thinking to deceive it by inserting a USB flash drive....
     
    Mr. Man-wai Chang, Nov 21, 2013
    #1
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  2. Mr. Man-wai Chang

    Paul Guest

    It's possible the information is part of the USB Class
    and is in the configuration table of the USB chip.

    See the section "Removable or what?" here, where it
    mentions DRIVE_REMOVABLE and DRIVE_FIXED. It sounds
    like the Panasonic is looking for "DRIVE_FIXED".

    http://www.uwe-sieber.de/usbstick_e.html

    Looking at this thread, it's suggesting the drive itself has
    an "RMB" bit. The hack in this case, involves preventing
    the OS from seeing the RMB bit. But you don't have
    access to the OS on the Panasonic.

    http://hardforum.com/showthread.php?t=1655684

    You could try an SSD inside a USB SATA enclosure, as
    a means to make it look like a fixed disc. And
    then you'd be recording on flash chips, without
    the same issues as would exist with a hard drive.

    Paul
     
    Paul, Nov 21, 2013
    #2
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  3. So I could not alter that GetDriveType() bit inside a USB flash drives?
     
    Mr. Man-wai Chang, Nov 21, 2013
    #3
  4. Mr. Man-wai Chang

    Paul Guest

    Some USB chips have "factory" software for preparing
    USB configuration information.

    But it's not something users normally get access to.

    Paul
     
    Paul, Nov 21, 2013
    #4
  5. Mr. Man-wai Chang

    VanguardLH Guest

    Every USB device during its handshaking with the computer sends its
    presentation data that defines the device and how the computer will
    interface with the device. This is the USB enumeration process. It's
    the stuff that gets stored in the registry under the Enum key.

    Lots to read:
    http://www.lvr.com/usbcenum.htm
    http://msdn.microsoft.com/en-us/library/windows/hardware/ff537109(v=vs.85).aspx
    http://blogs.msdn.com/b/usbcoreblog/archive/2009/10/31/how-does-usb-stack-enumerate-a-device.aspx
     
    VanguardLH, Nov 21, 2013
    #5
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