How to write bytes to a specific disk sector c#?

Question

Programming

Good day to all.
I am writing a program for guaranteed data destruction. The question arose about overwriting clusters where the file is located. At the current stage, it is not possible to jump to the specified position on the disk. Tried to use a function that SetFilePointerreturns -1.

SafeFileHandle hDrive = CreateFile("\\\\.\\" + fileRoot, GENERIC_WRITE, FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (SetFilePointerEx(hDrive, start, &start2, 0) != -1)
{
    ...
    WriteFile(hDrive, buff, buff.Length, &retBytes, null)
}

What can you advise and how to fix it?

Answer 1

I advise you to call GetLastError on an error and see what it returns. Without an error code - fortune-telling on the coffee grounds.

Answer 2

The question arose about overwriting clusters where the .

If this is the only problem, then you can overwrite the contents of the file itself.
This won't work on Copy-on-write filesystems, but it doesn't seem to work on windows.