internal static ulong GetFilesizeInSectors(IntPtr handle, ulong sectorSize, int offset = 0)
{
ulong retVal = 0;
long fileSize = 0;
if (!NativeDisk.GetFileSizeEx(handle, out fileSize))
{
var exception = new Win32Exception(Marshal.GetLastWin32Error());
throw new Exception(string.Format("Error occured when trying to get file size in sectors.\nError code: {0}\nMessage: {1}", exception.NativeErrorCode, exception.Message));
}
fileSize -= offset;
retVal = (ulong)((fileSize / (long)sectorSize) + ((fileSize % (long)sectorSize) > 0 ? 1 : 0));
return(retVal);
}