disk I/O in NT

How do I read and write to the boot sector of a floppy or hard disk in NT using Visual C++.  I've been reading docs on the internet and I think I need to use the CreateFile and DeviceIoControl functions, but all the examples on the internet only explain how to read and write to a file on the disk.  I would like to read and write to the boot sector of these disks.

Thanks in advance,
MVF
VjekoslavAsked:
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