..ctor Partition

    public Partition(BlockDevice aHost, UInt64 aStartingSector, UInt64 aSectorCount) {
      mHost = aHost;
      mStartingSector = aStartingSector;
      mBlockCount = aSectorCount;
      var xSize1 = aHost.BlockSize;
      UInt64 xSize2 = 7;
      xSize2 = mHost.BlockSize;
      mBlockSize = aHost.BlockSize;
    }