Determining CreateFile 1st parameter lpFileName for USB access

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C

Hi,
I'm developing the application for partitioning the pen drive. For that i'm using CreateFile function for opening the device handle. The function is:

CreateFile(
LPCTSTR lpFileName, // file name
DWORD dwDesiredAccess, // access mode
DWORD dwShareMode, // share mode
LPSECURITY_ATTRIBUTES lpSecurityAttributes, // SD
DWORD dwCreationDisposition, // how to create
DWORD dwFlagsAndAttributes, // file attributes
HANDLE hTemplateFile // handle to template
file
);

How do I determine what the first parameter should be? I guess it should be something similar to

"\\\\.\\xxxUSBxxx;

Where can I look for clues on what this string should be?

Thanks in Advance
Regards
Mohanraj