I am writing a C++ program that is currently capable of opening any drive given a disk letter ('C', 'D', etc), and then reading or writing to any sector within that drive given a sector identifier (index).
I am using the Windows File API (CreateFile, ReadFile, SetFilePointer, etc.) for achieving this thus far. Also, for insight, I calculate the offset to read from/write to, using:
disk sector size * sector index + offset
Now, I would like to be able to check whether any given sector (specified by an index for example), is in use by the file system already before reading from/writing to it. How could I achieve this?
I am fairly sure it isn't even possible, but, maybe someone out there knows a way.