Disk Utility create image error - "Invalid Argument"  - on USB drive.

I wanted to use a USB 2.0 drive that I share with a Windows machine to backup my son's iBook. I divided the drive into two partitions and formatted the iBook backup partition as FAT32. I attempted to create a read-only disk image on the USB drive in order to backup the iBook, but it does not complete successfully - it terminates with an "Invalid Argument" error. I also tried creating a read/write disk image and that terminates with an error "File or Folder not found." Anyone have any tips or clues as to what may be the problem?
iBook   Mac OS X (10.4.3)  

I figured out my problem to some extent. I was not creating an empty image, but was trying to create a disk image without selecting a folder. Once I selected create an empty image from the File menu I did not get the error and was able to create an empty image on the USB drive.

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    GPT_BASIC_DATA_ATTRIBUTE_NO_DRIVE_LETTER = 0x8000000000000000,
    GPT_BASIC_DATA_ATTRIBUTE_HIDDEN = 0x4000000000000000,
    GPT_BASIC_DATA_ATTRIBUTE_SHADOW_COPY = 0x2000000000000000,
    GPT_BASIC_DATA_ATTRIBUTE_READ_ONLY = 0x1000000000000000
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    public struct DRIVE_LAYOUT_INFORMATION_UNION
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    [StructLayout(LayoutKind.Sequential)]
    public struct DRIVE_LAYOUT_INFORMATION_GPT
    public Guid DiskId;
    public long StartingUsableOffset;
    public long UsableLength;
    public int MaxPartitionCount;
    [StructLayout(LayoutKind.Sequential)]
    public struct DRIVE_LAYOUT_INFORMATION_MBR
    public uint Signature;
    public enum PARTITION_STYLE : int
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    GuidPartitionTable = 1,
    Raw = 2

    Hello,
    in the links below you can found many informations to help you:
    https://msdn.microsoft.com/en-us/library/windows/desktop/aa365730(v=vs.85).aspx
    http://www.codeproject.com/Articles/696388/Recover-Data-From-Corrupted-Drives-File-Systems-FA
    http://www.functionx.com/vcsharp/fileprocessing/drives.htm
    http://forums.codeguru.com/showthread.php?548305-partitioning-USB-Falsh-drive
    http://forums.codeguru.com/showthread.php?548169-USB-Flash-drive-Partitioning

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